Complete Summary and Solutions for Cellular Organelles – NCERT Class XI Biotechnology, Chapter 2 – Structure, Functions, Mechanisms, Exercises

Comprehensive summary and explanation of Chapter 2 'Cellular Organelles' from the NCERT Class XI Biotechnology textbook, covering structure, classification, functions, mechanisms of cellular transport, major organelles, and answers to all textbook questions.

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Cellular Organelles: Class 11 NCERT Chapter 2 - Ultimate Study Guide, Notes, Questions, Quiz 2025

Full Chapter Summary & Detailed Notes - Cellular Organelles Class 11 NCERT

Overview & Key Concepts

Chapter Goal: Understand structure and functions of prokaryotic and eukaryotic cells, focusing on organelles. Exam Focus: Fluid mosaic model, transport mechanisms, cell wall differences, endomembrane system. 2025 Updates: Emphasis on dynamic nature of membranes, role in cellular processes. Fun Fact: Cells perform multitasking like digestion and protein synthesis simultaneously. Core Idea: Cells as basic units with specialized organelles. Real-World: Organelle dysfunction links to diseases like mitochondrial disorders. Ties: Builds on cell theory; leads to biomolecules (Ch3). Expanded: All subtopics covered point-wise with diagram descriptions for visual learning.
Wider Scope: From prokaryotic simplicity to eukaryotic complexity; common components like plasma membrane.
Expanded Content: Detailed on all 12 sections (2.1-2.12), including transport, walls, systems, powerhouses, factories, skeletons, motility, control centers.

2.1 Plasma Membrane

Structure & Function: Selective boundary of cytoplasm, guarded by extracellular matrix; maintains cell identity and relations with environment.
Historical Insight: Chemical composition (lipids ~40%, proteins ~52% in RBCs) understood post-electron microscope; Edwin Gorter & F. Grendel (1925) proposed bilayer from RBC lipids covering surface twice.
Fluid Mosaic Model (Singer & Nicolson, 1972): Quasi-fluid lipid bilayer with embedded globular proteins; dynamic, allows lateral diffusion of lipids/proteins.
Components: Phospholipids (hydrophilic heads outward, hydrophobic tails inward); cholesterol for fluidity; peripheral proteins (signaling, superficial); integral proteins (transmembrane channels, most abundant).
Prokaryotic Similarity: Structurally akin to eukaryotic membranes.
Special Structures: Mesosomes (extensions as vesicles/tubules/lamellae) increase surface area in prokaryotes.
Dynamic Nature: Enables cell division, growth, secretion, endocytosis, intercellular communication.

Fig. 2.1: Schematic Diagram of Fluid Mosaic Model (Description)

Bilayer with hydrophilic heads outside/inside, hydrophobic tails in middle; embedded integral/peripheral proteins, cholesterol, glycoproteins/glycolipids on outer surface; shows channel proteins and quasifluid state.

Box 1: Gorter & Grendel Experiment (Description)

RBCs washed/extracted with acetone; lipids formed two-molecule layer covering cell surface; electron micrograph shows 'railroad track' (dense lines for heads, light for tails); proposed bilayer over monolayer.

Transport Across Membrane

Selective Permeability: Restricts movement, maintains composition.
Passive Transport: No energy; diffusion/osmosis along gradient.
Facilitated Transport: Carrier/channel proteins for ions/uncharged molecules (e.g., glucose transporter, aquaporins for water, ion-gated channels in muscle/nerve).
Active Transport: Against gradient, uses ATP (e.g., Na+-K+ pump: 3 Na+ out, 2 K+ in, maintains -60mV potential).
Coupled Transport: ATP-independent; symport (same direction, e.g., Na+/glucose), antiport (opposite, e.g., Na+/Ca2+), uniport (single, e.g., glucose facilitated).

Fig. 2.2: Membrane Transport (Description)

(a) Facilitated: Glucose enters via carrier protein. (b) Ion-gated channel: Closed/open pore with gate for ions.

Fig. 2.3: Na+-K+ Pump (Description)

Pump extrudes Na+, imports K+ using ATP; shows concentrations (high Na+ out, high K+ in) and membrane potential.

2.2 Cell Wall

Presence & Role: Surrounds plasma membrane in bacteria/algae/fungi/plants (absent in animals); provides rigidity, shape, osmotic protection, cell-cell interaction, mechanical strength against infection.
Prokaryotic Structure: Peptidoglycan (polysaccharide cross-linked by peptides); Gram-positive: Thick wall + single membrane; Gram-negative: Thin wall + dual membrane with periplasmic space, LPS, porins.
Growth & Antibiotics: Expands/divides with cell; antibiotics inhibit peptidoglycan cross-linking.
Glycocalyx: Glycosylated protein layer; slime layer (loose) or capsule (thick); barrier to pathogens, cell interactions, stress protection.
Eukaryotic Structure: Polysaccharides; plants: Cellulose (β-D-glucose β1→4 links); fungi: Chitin (N-acetylglucosamine β1→4 links).
Plant Cell Wall Layers: Primary (thin, expandable); secondary (thick, lignified, rigid); middle lamella (calcium pectate) joins cells; plasmodesmata connect cytoplasms.

Fig. 2.4: Prokaryotic Cell Wall (Description)

(a) Gram-positive: Thick peptidoglycan, teichoic acid, single membrane. (b) Gram-negative: Thin peptidoglycan, outer membrane with LPS/porins, periplasm.

Fig. 2.5: Eukaryotic Cell Wall Components (Description)

(a) Cellulose: Linear β-D-glucose chains via β1→4 glycosidic bonds. (b) Chitin: Linear N-acetylglucosamine chains via β1→4 glycosidic bonds.

2.3 Endomembrane System

Overview: Coordinated membrane-bound organelles for protein/lipid synthesis, processing, packaging, transport; includes ER, Golgi, lysosomes, vacuoles.
2.3.1 Endoplasmic Reticulum: Extensive tubules/cisternae network near nucleus/Golgi; eukaryotic only; large/dynamic.
Types: Rough ER (ribosome-studded, protein synthesis); Smooth ER (lipid synthesis, detoxification).
Functions: Protein folding/transport, Ca2+ storage, steroid synthesis.

Box 2: Endomembrane System Role (Description)

Flow: ER synthesis → Golgi processing/packaging → Lysosome/vacuole delivery; lipids/proteins modified en route.

2.4 Mitochondria

Structure: Double-membrane (outer smooth, inner cristae-folded); matrix with DNA/ribosomes; 'powerhouse'.
Functions: ATP production via oxidative phosphorylation; Krebs cycle in matrix.
Origin: Endosymbiotic from aerobic bacteria.

2.5 Plastids

Types: Chloroplasts (photosynthesis, thylakoids/stroma), chromoplasts (pigments), leucoplasts (storage).
Functions: Light energy capture, pigment/color, starch/oil/protein storage.
Plant-Specific: Semi-autonomous with DNA.

2.6 Ribosomes

Structure: Non-membrane, 70S prokaryotic/80S eukaryotic; rRNA + proteins.
Functions: Protein synthesis sites; free (cytosol) or ER-bound.
Universal: In all cells.

2.7 Microbodies

Types: Peroxisomes (H2O2 breakdown), glyoxysomes (fatty acid metabolism in seeds).
Functions: Detoxification, photorespiration, lipid mobilization.
Single-Membrane: Oxidative reactions.

2.8 Cytoskeleton

Components: Microtubules (tubulin, motility/spindle), microfilaments (actin, contraction), intermediate filaments (support).
Functions: Shape maintenance, intracellular transport, cytokinesis, organelle positioning.
Dynamic: Polymerize/depolymerize.

2.9 Cilia and Flagella

Structure: 9+2 microtubule arrangement; basal body (9 triplets).
Functions: Motility (flagella few/long, cilia many/short); e.g., sperm flagella, respiratory cilia.
Eukaryotic: Dynein-powered bending.

2.10 Centrosome and Centrioles

Structure: Centrosome with two centrioles (9 triplets microtubules); animal cells.
Functions: Microtubule organizing center; spindle formation in division.
Absent in Higher Plants: Alternative mechanisms.

2.11 Nucleus

Structure: Double membrane with pores; chromatin (DNA+proteins), nucleolus (rRNA).
Functions: Genetic control, transcription, ribosome assembly.
Eukaryotic Hallmark: Membrane-bound.

2.12 Chromosome

Structure: Condensed chromatin during division; histones, centromere/telomeres.
Functions: Gene packaging, segregation in mitosis/meiosis.
Number Varies: Hereditary material carrier.

Summary

Cells: Prokaryotic (simple, no nucleus) vs. Eukaryotic (complex, organelles); common: Plasma membrane, ribosomes.
Organelles: Specialized for energy, synthesis, support, control.

Why This Guide Stands Out

Cell-focused: Detailed subtopics, transport steps, wall comparisons. Free 2025 with point-wise notes, diagram desc for easy visualization.

Key Themes & Tips

Aspects: Structure-function link, prokaryote-eukaryote differences, dynamic processes.
Tip: Mnemonics for organelles (e.g., 'PME-MPRC' for Plasma, Mitochondria, ER, etc.); draw fluid mosaic for recall.

Exam Case Studies

Mesosome role in prokaryotes: Surface increase for respiration. Aquaporins: Water channels prevent wilting in plants.

Project & Group Ideas

Model cell organelles with clay/3D print.
Debate: Cell wall necessity in plants vs. animals.
Research: Mitochondrial diseases and ATP defects.

Key Definitions & Terms - Complete Glossary

All terms from chapter; detailed with examples, relevance. Expanded: 20+ terms with depth for easy learning; grouped by subtopic.

Plasma Membrane

Semipermeable lipid bilayer boundary. Relevance: Cell identity. Ex: RBC 52% protein. Depth: Fluid mosaic; dynamic diffusion.

Fluid Mosaic Model

Dynamic bilayer with protein mosaic. Relevance: Membrane function. Ex: Singer-Nicolson 1972. Depth: Quasi-fluid, lateral movement.

Passive Transport

Gradient-driven, no energy movement. Relevance: Simple diffusion. Ex: Osmosis. Depth: Along concentration; no carriers needed.

Active Transport

Energy-requiring against gradient. Relevance: Ion balance. Ex: Na+-K+ pump. Depth: ATP hydrolysis; maintains potential.

Aquaporins

Water channel proteins. Relevance: Hydration. Ex: Plant/animal cells. Depth: Facilitated diffusion; critical for osmosis.

Cell Wall

Rigid outer layer for support. Relevance: Osmotic protection. Ex: Peptidoglycan in bacteria. Depth: Gram +/- differences.

Peptidoglycan

Cross-linked polysaccharide-peptide. Relevance: Bacterial rigidity. Ex: Antibiotic target. Depth: Inhibited by penicillin.

Glycocalyx

Glycosylated protein layer. Relevance: Pathogen barrier. Ex: Capsule in bacteria. Depth: Slime vs. capsule forms.

Cellulose

β1→4 glucose polymer. Relevance: Plant wall. Ex: Primary wall. Depth: Linear chains; expandable.

Chitin

N-acetylglucosamine polymer. Relevance: Fungal wall. Ex: Exoskeleton. Depth: β1→4 links; rigid.

Endomembrane System

Coordinated organelles for synthesis/transport. Relevance: Protein processing. Ex: ER-Golgi-lysosome. Depth: Membrane continuity.

Endoplasmic Reticulum (ER)

Tubule/cisternae network. Relevance: Synthesis. Ex: Rough ER proteins. Depth: RER ribosomes, SER lipids.

Mitochondria

Double-membrane ATP factory. Relevance: Energy. Ex: Cristae for ETC. Depth: Own DNA; endosymbiotic.

Plastids

Plant organelles for photosynthesis/storage. Relevance: Pigments. Ex: Chloroplast thylakoids. Depth: Chloroplast/chromoleucoplasts.

Ribosomes

Protein synthesis machinery. Relevance: Translation. Ex: 80S eukaryotic. Depth: Free/bound; universal.

Peroxisomes

Microbody for H2O2 detox. Relevance: Oxidation. Ex: Glyoxysomes in seeds. Depth: Single membrane.

Cytoskeleton

Protein network for shape/movement. Relevance: Support. Ex: Microtubules in spindle. Depth: Actin/tubulin/intermediate.

Cilia/Flagella

Motile 9+2 structures. Relevance: Locomotion. Ex: Sperm flagella. Depth: Dynein arms; basal body.

Centrioles

9-triplet MTOC. Relevance: Division. Ex: Spindle poles. Depth: Animal cells only.

Nucleus

Control center with DNA. Relevance: Heredity. Ex: Nuclear pores for mRNA. Depth: Double membrane, nucleolus.

Chromosome

Condensed chromatin. Relevance: Gene carrier. Ex: Mitosis segregation. Depth: Histone-packaged.

Tip: Group by prokary/eukary; examples for recall. Depth: Functions link to processes. Errors: Confuse RER/SER. Historical: Gorter 1925 bilayer. Interlinks: Biomolecules Ch3. Advanced: Endosymbiosis. Real-Life: Cilia defects in respiratory diseases. Graphs: Fig 2.1 model. Coherent: Structure → Function → Transport. For easy learning: Flashcard per term.

60+ Questions & Answers - NCERT Based (Class 11) - From Exercises & Variations

Based on chapter content + expansions. Part A: 10 (1 mark short, one line each), Part B: 10 (4 marks medium, five lines each), Part C: 10 (6 marks long, eight lines each). Answers point-wise, step-by-step for marks. Easy learning: Structured, concise.

Part A: 1 Mark Questions (10 Qs - Short from Content)

1. Who proposed the fluid mosaic model of plasma membrane?

1 Mark Answer: Singer and Nicolson in 1972.

2. What is the major lipid in plasma membrane?

1 Mark Answer: Phospholipids.

3. Name the transport requiring ATP against gradient.

1 Mark Answer: Active transport.

4. What is the bacterial cell wall component?

1 Mark Answer: Peptidoglycan.

5. Differentiate Gram-positive and Gram-negative walls.

1 Mark Answer: Gram-positive thick peptidoglycan; Gram-negative thin with outer membrane.

6. What is the plant cell wall polymer?

1 Mark Answer: Cellulose.

7. Name the endomembrane system components.

1 Mark Answer: ER, Golgi, lysosomes, vacuoles.

8. What is the function of mitochondria?

1 Mark Answer: ATP production.

9. What is the 9+2 structure in?

1 Mark Answer: Cilia and flagella.

10. What organizes spindle in animal cells?

1 Mark Answer: Centrioles.

Part B: 4 Marks Questions (10 Qs - Medium, Exactly 5 Lines Each)

1. Describe the fluid mosaic model.

4 Marks Answer:

Proposed by Singer and Nicolson in 1972.
Lipid bilayer with embedded proteins in mosaic pattern.
Quasifluid state allows lateral diffusion.
Phospholipids: Hydrophilic heads out, tails in.
Proteins: Peripheral (signaling), integral (channels).

2. Explain passive and facilitated transport.

4 Marks Answer:

Passive: No energy, along gradient via diffusion/osmosis.
Limited to small uncharged molecules.
Facilitated: Carrier/channel proteins for larger/charged (e.g., glucose).
Aquaporins: Water-specific channels.
Ion channels: Gated in muscle/nerve.

3. Describe Na+-K+ pump mechanism.

4 Marks Answer:

Active transport using ATP.
Pumps 3 Na+ out, 2 K+ in against gradient.
Maintains -60mV potential.
High Na+ outside, high K+ inside.
Essential for nerve/muscle function.

4. Differentiate prokaryotic cell walls.

4 Marks Answer:

Gram-positive: Thick peptidoglycan, teichoic acid, single membrane.
Gram-negative: Thin peptidoglycan, periplasm, outer LPS membrane.
Porins in outer for nutrient entry.
Antibiotics target cross-linking.
Glycocalyx: Capsule/slime for protection.

5. Explain plant cell wall layers.

4 Marks Answer:

Primary: Thin, cellulose for expansion.
Secondary: Thick, lignified for rigidity.
Middle lamella: Calcium pectate joins cells.
Plasmodesmata: Cytoplasmic connections.
Prevents bursting from osmosis.

6. Describe endomembrane system.

4 Marks Answer:

ER, Golgi, lysosomes, vacuoles coordinated.
Protein/lipid synthesis to transport.
Membrane continuity for modification.
RER: Ribosome-bound protein synthesis.
SER: Lipid/detox functions.

7. Outline mitochondria structure.

4 Marks Answer:

Double membrane: Outer smooth, inner cristae.
Matrix: Enzymes, mtDNA, 70S ribosomes.
Site of Krebs/ETC.
Endosymbiotic origin.
Autonomous replication.

8. What are plastids? Give types.

4 Marks Answer:

Plant double-membrane organelles.
Chloroplasts: Photosynthesis, thylakoids.
Chromoplasts: Pigments for color.
Leucoplasts: Storage (amyloplasts starch).
Interconvertible.

9. Explain cytoskeleton components.

4 Marks Answer:

Microtubules: Tubulin, spindle/transport.
Microfilaments: Actin, contraction/cytokinesis.
Intermediate: Keratin, mechanical strength.
Dynamic assembly.
Maintains shape, motility.

10. Describe nucleus functions.

4 Marks Answer:

Double membrane with pores.
Chromatin: DNA+histones for genes.
Nucleolus: rRNA/ribosome assembly.
Transcription site.
Controls cellular activities.

Part C: 6 Marks Questions (10 Qs - Long, Exactly 8 Lines Each)

1. Explain plasma membrane structure and transport.

6 Marks Answer:

Fluid mosaic: Bilayer phospholipids, proteins mosaic.
Heads hydrophilic out, tails hydrophobic in.
Cholesterol fluidity; peripheral/integral proteins.
Passive: Diffusion/osmosis no energy.
Facilitated: Carriers for glucose/aquaporins water.
Active: ATP for Na+-K+ pump, maintains ions.
Coupled: Symport/antiport/uniport.
Dynamic for division/secretion/endocytosis.

2. Compare prokaryotic and eukaryotic cell walls.

6 Marks Answer:

Prokaryotic: Peptidoglycan rigid; Gram+ thick single membrane.
Gram- thin dual membrane, LPS periplasm.
Glycocalyx capsule protection.
Eukaryotic: Polysaccharides; plants cellulose primary/secondary.
Fungi chitin; middle lamella pectate.
Plasmodesmata connections in plants.
Functions: Shape, osmosis, infection barrier.
Antibiotics target bacterial cross-links.

3. Describe endomembrane system and ER.

6 Marks Answer:

ER/Golgi/lysosomes/vacuoles for synthesis/transport.
Membrane-bound, co-ordinated functions.
ER: Tubules/cisternae near nucleus.
RER: Ribosomes protein synthesis/folding.
SER: Lipids, detox, Ca2+ storage.
Dynamic eukaryotic structure.
Protein modification en route to Golgi.
Essential for secretion/packaging.

4. Elaborate on mitochondria and plastids.

6 Marks Answer:

Mitochondria: Double membrane, cristae for ETC.
Matrix Krebs, ATP powerhouse.
mtDNA semi-autonomous.
Plastids: Plant-specific, double membrane.
Chloroplasts: Thylakoids photosynthesis.
Chromoplasts pigments, leucoplasts storage.
Interconvert; own DNA.
Endosymbiotic origins both.

5. Discuss ribosomes and microbodies.

6 Marks Answer:

Ribosomes: Non-membrane, 70S/80S protein factories.
Free cytosol, bound RER.
rRNA+proteins; universal.
Microbodies: Single membrane peroxisomes.
H2O2 catalase breakdown.
Glyoxysomes: Seed lipid to carbs.
Oxidative reactions.
Detox/photorespiration roles.

6. Explain cytoskeleton functions.

6 Marks Answer:

Microtubules: Tubulin tracks for transport/spindle.
Microfilaments: Actin cytokinesis/amoeboid movement.
Intermediate: Tensile strength.
Dynamic polymerization.
Organelle positioning.
Cell shape maintenance.
Motility in non-ciliated cells.
Essential for division.

7. Describe cilia/flagella and centrosome.

6 Marks Answer:

9+2 microtubules, dynein bending.
Flagella: Long, propulsion (sperm).
Cilia: Short, sweeping (trachea).
Basal body anchors.
Centrosome: Two centrioles MTOC.
9 triplets tubulin.
Spindle in animal mitosis.
Absent in plants.

8. Outline nucleus and chromosome.

6 Marks Answer:

Double envelope, pores for exchange.
Chromatin loose, nucleolus rRNA.
Transcription/ribosome assembly.
Genetic control center.
Chromosome: Condensed chromatin division.
Histone coils, centromere kinetochore.
Telomeres ends.
Segregation in mitosis.

9. Compare prokaryotic and eukaryotic cells.

6 Marks Answer:

Prokaryotic: No nucleus, 70S ribosomes, mesosomes.
Flagella simple, peptidoglycan wall.
Eukaryotic: Nucleus, 80S ribosomes, organelles.
Membrane-bound mito/plastids.
Cilia 9+2, cytoskeleton complex.
Common: Plasma membrane, DNA.
Evo: Prokaryotes simpler, ancestors.
Functions adapted complexity.

10. Discuss organelle roles in cellular processes.

6 Marks Answer:

Plasma: Barrier/transport.
Wall: Support/protection.
Endomembrane: Synthesis/packaging.
Mito/plastids: Energy.
Ribosomes: Proteins.
Cytoskeleton: Movement/shape.
Cilia: Motility.
Nucleus/chromosomes: Control/inheritance.

Tip: Use diagrams/transport examples for marks; practice point-wise. Easy learning: Short for recall, long for essays.

Key Concepts - In-Depth Exploration

Core ideas with examples, pitfalls, interlinks. Expanded: All concepts from 2.1-2.12 with steps/examples/steps for easy learning.

Fluid Mosaic Model

Dynamic membrane. Steps: 1. Bilayer formation, 2. Protein embed, 3. Diffusion. Ex: RBC proteins 52%. Pitfall: Static view. Interlink: Transport. Depth: Gorter bilayer basis; cholesterol modulation.

Membrane Transport

Movement mechanisms. Steps: Passive (gradient), Facilitated (proteins), Active (ATP). Ex: Aquaporins water. Pitfall: Confuse uniport/symport. Interlink: Bioenergetics Ch4. Depth: Na+-K+ maintains potential; coupled for efficiency.

Cell Wall Differences

Support structures. Steps: Prok peptidoglycan cross-link, Euk polysaccharide deposit. Ex: Gram staining. Pitfall: Ignore glycocalyx. Interlink: Cellular processes Ch5. Depth: Plasmodesmata communication; lignin rigidity.

Endomembrane System

Synthesis-transport network. Steps: ER synthesis → Golgi modify → Lysosome digest. Ex: Protein glycosylation. Pitfall: Overlook continuity. Interlink: Biomolecules Ch3. Depth: RER/SER specializations; vacuole storage.

Mitochondria & Plastids

Energy organelles. Steps: Mito ETC/ATP, Plastid light reactions. Ex: Chloroplast thylakoids. Pitfall: Forget endosymbiosis. Interlink: Enzymes Ch4. Depth: Own genome; interconversion in plants.

Ribosomes & Microbodies

Synthesis/detox sites. Steps: Ribosome translation, Peroxisome H2O2 catalase. Ex: Glyoxysomes gluconeogenesis. Pitfall: Non-membrane confusion. Interlink: Protein synth. Depth: 70S/80S; beta-oxidation.

Cytoskeleton

Internal framework. Steps: Polymerize (tubulin/actin), depolymerize for change. Ex: Spindle mitosis. Pitfall: Static skeleton. Interlink: Division Ch5. Depth: Motor proteins kinesin/dynein transport.

Cilia/Flagella & Centrosome

Motility/control. Steps: Dynein slide microtubules 9+2. Ex: Ciliary beating. Pitfall: Prok/euk flagella diff. Interlink: Reproduction. Depth: Basal body = centriole; plant alternatives.

Nucleus & Chromosome

Genetic center. Steps: Transcription in nucleoplasm, condensation to chromosomes. Ex: Nucleolus ribosomes. Pitfall: Chromatin vs. chromosome. Interlink: Genetics. Depth: Pores mRNA export; histone acetylation.

Prok vs. Euk Cells

Organization types. Steps: Prok nucleoid/mesosomes, Euk compartments. Ex: 70S vs. 80S. Pitfall: Overlap ignore. Interlink: Evolution. Depth: Endosymbiosis for organelles; complexity increase.

Advanced: Vesicle trafficking. Pitfalls: Membrane fluidity role. Interlinks: Ch1 cell theory. Real: Cystic fibrosis CFTR channel defect. Depth: 9+2 axoneme. Examples: Mesosome respiration. Graphs: Fig 2.3 pump. Errors: Wall in animals. Tips: Steps for transport; compare tables.

Solved Examples - From Text with Simple Explanations

Expanded with more examples, steps for easy understanding; focus on key figures.

Example 1: Fluid Mosaic Model (Fig 2.1)

Simple Explanation: Membrane as fluid protein mosaic; allows movement.

Step 1: Phospholipid bilayer self-assembles.
Step 2: Proteins insert (integral span, peripheral attach).
Step 3: Glycoproteins for recognition.
Step 4: Cholesterol stabilizes fluidity.
Simple Way: Like a crowded dance floor, molecules slide.

Example 2: Na+-K+ Pump (Fig 2.3)

Simple Explanation: Ion balance for signals; uses energy.

Step 1: ATP binds, changes conformation.
Step 2: Releases 3 Na+ outside.
Step 3: Binds 2 K+ from outside.
Step 4: Hydrolyzes ATP, returns shape.
Simple Way: Door pumps out trash (Na+), lets in recyclables (K+).

Example 3: Gram-Negative Wall (Fig 2.4b)

Simple Explanation: Extra protection but antibiotic entry via porins.

Step 1: Thin peptidoglycan core.
Step 2: Periplasm enzymes.
Step 3: Outer LPS/endotoxin.
Step 4: Porins selective pores.
Simple Way: Double fence with gate (porins).

Example 4: Plant Wall Layers

Simple Explanation: Builds strength as cell matures.

Step 1: Primary thin for growth.
Step 2: Secondary lignified rigid.
Step 3: Middle lamella glues neighbors.
Step 4: Plasmodesmata channels.
Simple Way: Flexible skin to armor plating.

Example 5: ER Functions

Simple Explanation: Cell's workshop for proteins/lipids.

Step 1: RER ribosomes translate.
Step 2: Fold in lumen.
Step 3: Vesicles to Golgi.
Step 4: SER detoxifies drugs.
Simple Way: Assembly line to shipping.

Tip: Practice labeling diagrams; link steps to functions.

Quick Revision Notes & Mnemonics

Concise notes for all subtopics 2.1-2.12; mnemonics for easy recall. Covers structures, functions, differences.

2.1 Plasma Membrane

Fluid mosaic: Bilayer + proteins (Mnemonic: "Phospho-Lipid Protein Party" - PLPP).
Transport: Passive/Facilitated/Active ( "PFA Energy None/Some/Full" - PFA).
Na-K pump: 3 out 2 in ATP.

2.2 Cell Wall

Prok: Peptido Gram+/- ( "Pepto Thick/Thin Dual" - PTD).
Euk: Cellulose/Chitin Plant/Fungus ( "Cell Chit Green/Mushroom" - CCG).
Layers: Primary/Secondary Lamella ( "PSL Grow Rigid Glue" - PSL).

2.3 Endomembrane

ER/Golgi/Lys/Vac ( "EGLV Synth Pack Digest Store" - EGLV).
RER: Ribosomes proteins; SER: Smooth lipids ( "Rough Smooth Protein Lipid" - RSPL).

2.4 Mitochondria

Double Cristae Matrix ATP ( "DCMA Powerhouse" - DCMA).
mtDNA endosymbiotic.

2.5 Plastids

Chloro/Chromo/Leuco Photo/Color/Store ( "CCL Green Pigment Starch" - CCL).
Thylakoids stroma.

2.6 Ribosomes

70S/80S Free/Bound Translate ( "70 Free Prok, 80 Bound Euk" - 70F80B).

2.7 Microbodies

Peroxisome H2O2; Glyoxy Seed Fat ( "PH GSF Detox" - PHGSF).

2.8 Cytoskeleton

MicroTub/Actin/Inter Spindle/Contract/Support ( "TAI Move Shape" - TAI).

2.9 Cilia/Flagella

9+2 Dynein Beat ( "9+2 DB Motile" - 9DB).
Many short cilia, few long flagella.

2.10 Centrosome

Centrioles 9 triplets MTOC Spindle ( "9T MS Animal" - 9TMS).

2.11 Nucleus

Double Pores Chromatin Nucleolus ( "DPCN Control" - DPCN).

2.12 Chromosome

Condensed Histone Centromere Segregate ( "CHCS Divide" - CHCS).

Overall Mnemonic: "Plasma Wall Endo Mito Plast Ribo Micro Cyto Cilia Centro Nucle Chromo" (PWEMPRMMCNC). Flashcards: One per section. Easy: Bullets, bold functions.

Term/Process	Description	Example	Usage
Fluid Mosaic Model	Dynamic bilayer with proteins	RBC membrane	Structure
Active Transport	ATP against gradient	Na+-K+ pump	Ion balance
Peptidoglycan	Cross-linked wall polymer	Bacterial rigidity	Prok wall
Glycocalyx	Glyco-protein layer	Capsule protection	Barrier
Cellulose	β-glucose chains	Plant primary wall	Support
Endomembrane System	Coordinated organelles	ER to Golgi	Synthesis
Rough ER	Ribosome-studded tubules	Protein folding	RER function
Mitochondria	Double-membrane ATP site	Cristae ETC	Energy
Chloroplast	Thylakoid photosynthesis	Stroma Calvin	Light capture
Ribosomes	Protein synthesis	80S eukaryotic	Translation
Peroxisomes	H2O2 breakdown	Catalase	Detox
Microtubules	Tubulin polymers	Spindle fibers	Cytoskeleton
9+2 Arrangement	Microtubule motility	Cilia beating	Locomotion
Centrioles	MTOC in centrosome	Mitotic spindle	Division
Nuclear Pores	Envelope channels	mRNA export	Exchange
Chromatin	DNA-protein complex	Gene expression	Nucleus
Mesosomes	PM folds in prok	Surface increase	Respiration
Plasmodesmata	Cytoplasmic bridges	Cell communication	Plants
Symport	Coupled same direction	Na+/glucose	Transport
Endosymbiosis	Organelle origin	Mito from bacteria	Evolution

Key Processes & Diagrams - Solved Step-by-Step

Expanded with all major processes; descriptions for diagrams; steps for visualization.

Process 1: Membrane Transport (Figs 2.2-2.3)

Step-by-Step:

Step 1: Passive diffusion for small molecules.
Step 2: Facilitated via carriers (glucose) or channels (ions/water).
Step 3: Active ATP hydrolysis changes pump shape.
Step 4: Ions move against gradient.
Step 5: Coupled uses one gradient for another.
Diagram Desc: 2.2 Carrier pore; 2.3 Pump with ATP/ions.

Process 2: Cell Wall Formation (Fig 2.4-2.5)

Step-by-Step:

Step 1: Peptidoglycan synthesis/cross-link in prok.
Step 2: Gram- outer LPS assembly.
Step 3: Plant primary cellulose deposit.
Step 4: Secondary lignin for strength.
Step 5: Middle lamella secretion.
Diagram Desc: 2.4 Walls labeled; 2.5 Polysaccharide chains.

Process 3: Protein Synthesis in Endomembrane

Step-by-Step:

Step 1: RER ribosomes translate mRNA.
Step 2: Polypeptide enters lumen.
Step 3: Folding/glycosylation.
Step 4: Vesicle to Golgi.
Step 5: Packaging/lysosome delivery.
Diagram Desc: Flow from ER to plasma.

Process 4: ATP Production in Mitochondria

Step-by-Step:

Step 1: Glycolysis cytosol to pyruvate.
Step 2: Krebs matrix CO2/NADH.
Step 3: ETC cristae electrons/O2.
Step 4: Proton gradient ATP synthase.
Step 5: ATP export.
Diagram Desc: Inner fold cristae, matrix enzymes.

Process 5: Ciliary Movement

Step-by-Step:

Step 1: 9+2 doublets with dynein.
Step 2: ATP dynein walks on adjacent.
Step 3: Sliding bends axoneme.
Step 4: Power/recovery stroke.
Step 5: Fluid propulsion.
Diagram Desc: Cross-section 9+2, bending wave.

Tip: Draw processes; label diagrams. Easy: Numbered steps with simple analogies.

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Sets and Venn Operations Fundamentals — Free CBSE Class 11 Annual Assessment Quiz

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Class 11 English — The Tale of Melon City (Practice Quiz)

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Class 11 English — Birth (Practice Quiz)

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Class 11 English — Mother's Day (Practice Quiz)

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Class 11 English — The Adventure (Practice Quiz)

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Class 11 English — Childhood (Practice Quiz)

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Class 11 English — The Ailing Planet: the Green Movement's Role (Practice Quiz)

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#13

Class 11 English — The Voice of the Rain (Practice Quiz)

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#14

Class 11 English — The Laburnum Top (Practice Quiz)

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Class 11 English — Discovering Tut: the Saga Continues (Practice Quiz)

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#16

Class 11 English — We're Not Afraid to Die... if We Can All Be Together (Practice Quiz)

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#17

Class 11 English — A Photograph (Practice Quiz)

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#18

Class 11 English — The Portrait of a Lady (Practice Quiz)

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#19

Class 11 Psychology — Motivation and Emotion (Practice Quiz)

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#20

Class 11 Psychology — Thinking (Practice Quiz)

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#21

Class 11 Psychology — Human Memory (Practice Quiz)

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#22

Class 11 Psychology — Learning (Practice Quiz)

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#23

Class 11 Psychology — Sensory, Attentional and Perceptual Processes (Practice Quiz)

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#24

Class 11 Psychology — Human Development (Practice Quiz)

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#25

Class 11 Psychology — Methods of Enquiry in Psychology (Practice Quiz)

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#26

Class 11 Psychology — What is Psychology? (Practice Quiz)

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#27

Class 11 Sociology — Indian Sociologists (Practice Quiz)

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#28

Class 11 Sociology — Introducing Western Sociologists (Practice Quiz)

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#29

Class 11 Sociology — Environment and Society (Practice Quiz)

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#30

Class 11 Sociology — Social Change and Social Order in Rural and Urban Society (Practice Quiz)

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#31

Class 11 Sociology — Social Structure, Stratification and Social Processes in Society (Practice Quiz)

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#32

Class 11 Sociology — Doing Sociology: Research Methods (Practice Quiz)

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#33

Class 11 Sociology — Culture and Socialisation (Practice Quiz)

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#34

Class 11 Sociology — Understanding Social Institutions (Practice Quiz)

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#35

Class 11 Sociology — Terms, Concepts and Their Use in Sociology (Practice Quiz)

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#36

Class 11 Sociology — Sociology and Society (Practice Quiz)

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#37

Class 11 Political Science — The Philosophy of the Constitution (Practice Quiz)

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#38

Class 11 Political Science — Constitution as a Living Document (Practice Quiz)

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#39

Class 11 Political Science — Local Governments (Practice Quiz)

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#40

Class 11 Political Science — Federalism (Practice Quiz)

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#41

Class 11 Political Science — Judiciary (Practice Quiz)

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#42

Class 11 Political Science — Legislature (Practice Quiz)

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#43

Class 11 Political Science — Executive (Practice Quiz)

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#44

Class 11 Political Science — Election and Representation (Practice Quiz)

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#45

Class 11 Political Science — Rights in the Indian Constitution (Practice Quiz)

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#46

Class 11 Political Science — Constitution: Why and How? (Practice Quiz)

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#47

Class 11 Political Science — Secularism (Practice Quiz)

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#48

Class 11 Political Science — Nationalism (Practice Quiz)

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#49

Class 11 Political Science — Citizenship (Practice Quiz)

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#50

Class 11 Political Science — Rights (Practice Quiz)

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#51

Class 11 Political Science — Social Justice (Practice Quiz)

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#52

Class 11 Political Science — Equality (Practice Quiz)

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#53

Class 11 Political Science — Freedom (Practice Quiz)

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#54

Class 11 Political Science — Political Theory: An Introduction (Practice Quiz)

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#55

Class 11 Geography — Natural Hazards and Disasters (Practice Quiz)

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#56

Class 11 Geography — Natural Vegetation (Practice Quiz)

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#57

Class 11 Geography — Climate (Practice Quiz)

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#59

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#60

Class 11 Geography — India – Location (Practice Quiz)

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#61

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#62

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#63

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#64

Class 11 Geography — World Climate and Climate Change (Practice Quiz)

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#65

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#66

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#67

Class 11 Geography — Solar Radiation, Heat Balance and Temperature (Practice Quiz)

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#68

Class 11 Geography — Composition and Structure of Atmosphere (Practice Quiz)

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#69

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#70

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#71

Class 11 Geography — Distribution of Oceans and Continents (Practice Quiz)

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#72

Class 11 Geography — Interior of the Earth (Practice Quiz)

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#73

Class 11 Geography — The Origin and Evolution of the Earth (Practice Quiz)

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#74

Class 11 Geography — Geography as a Discipline (Practice Quiz)

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#75

Class 11 History — Paths to Modernisation (Practice Quiz)

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#76

Class 11 History — Displacing Indigenous Peoples (Practice Quiz)

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#77

Class 11 History — Changing Cultural Traditions (Practice Quiz)

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#78

Class 11 History — The Three Orders (Practice Quiz)

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#79

Class 11 History — Nomadic Empires (Practice Quiz)

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#80

Class 11 History — An Empire Across Three Continents (Practice Quiz)

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#81

Class 11 History — Writing and City Life (Practice Quiz)

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#82

Class 11 Economics — Comparative Development Experiences of India and its Neighbours (Practice Quiz)

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#83

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#84

Class 11 Economics — Employment: Growth, Informalisation and Other Issues (Practice Quiz)

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#85

Class 11 Economics — Rural Development (Practice Quiz)

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#86

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#87

Class 11 Economics — Liberalisation, Privatisation and Globalisation: An Appraisal (Practice Quiz)

10 Qs · ~10 min

#88

Class 11 Economics — Indian Economy 1950-1990 (Practice Quiz)

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#89

Class 11 Economics — Indian Economy on the Eve of Independence (Practice Quiz)

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#90

Class 11 Economics — Use of Statistical Tools (Practice Quiz)

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#91

Class 11 Economics — Index Numbers (Practice Quiz)

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#92

Class 11 Economics — Correlation (Practice Quiz)

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#93

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#95

Class 11 Economics — Organisation of Data (Practice Quiz)

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#96

Class 11 Economics — Collection of Data (Practice Quiz)

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#97

Class 11 Economics — Introduction (Practice Quiz)

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#98

Class 11 Business Studies — International Business (Practice Quiz)

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#99

Class 11 Business Studies — Internal Trade (Practice Quiz)

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#100

Class 11 Business Studies — MSME and Business Entrepreneurship (Practice Quiz)

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#101

Class 11 Business Studies — Sources of Business Finance (Practice Quiz)

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#102

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#103

Class 11 Business Studies — Social Responsibilities of Business and Business Ethics (Practice Quiz)

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#104

Class 11 Business Studies — Emerging Modes of Business (Practice Quiz)

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#105

Class 11 Business Studies — Business Services (Practice Quiz)

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#106

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#107

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#108

Class 11 Business Studies — Business, Trade and Commerce (Practice Quiz)

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#109

Class 11 Accountancy — Financial Statements - II (Practice Quiz)

10 Qs · ~10 min

#110

Class 11 Accountancy — Financial Statements - I (Practice Quiz)

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#111

Class 11 Accountancy — Depreciation, Provisions and Reserves (Practice Quiz)

10 Qs · ~10 min

#112

Class 11 Accountancy — Trial Balance and Rectification of Errors (Practice Quiz)

10 Qs · ~10 min

#113

Class 11 Accountancy — Bank Reconciliation Statement (Practice Quiz)

10 Qs · ~10 min

#114

Class 11 Accountancy — Recording of Transactions - II (Practice Quiz)

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#115

Class 11 Accountancy — Recording of Transactions - I (Practice Quiz)

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#116

Class 11 Accountancy — Theory Base of Accounting (Practice Quiz)

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#117

Class 11 Accountancy — Introduction to Accounting (Practice Quiz)

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#118

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#119

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#120

Class 11 Maths — Limits and Derivatives (Practice Quiz)

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#121

Class 11 Maths — Introduction to Three Dimensional Geometry (Practice Quiz)

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#122

Class 11 Maths — Conic Sections (Practice Quiz)

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#123

Class 11 Maths — Straight Lines (Practice Quiz)

10 Qs · ~10 min

#124

Class 11 Maths — Sequences and Series (Practice Quiz)

10 Qs · ~10 min

#125

Class 11 Maths — Binomial Theorem (Practice Quiz)

10 Qs · ~10 min

#126

Class 11 Maths — Permutations and Combinations (Practice Quiz)

10 Qs · ~10 min

#127

Class 11 Maths — Linear Inequalities (Practice Quiz)

10 Qs · ~10 min

#128

Class 11 Maths — Complex Numbers and Quadratic Equations (Practice Quiz)

10 Qs · ~10 min

#129

Class 11 Maths — Relations and Functions (Practice Quiz)

10 Qs · ~10 min

#130

Class 11 Maths — Sets (Practice Quiz)

10 Qs · ~10 min

#131

Class 11 Biology — Chemical Coordination and Integration (Practice Quiz)

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#132

Class 11 Biology — Neural Control and Coordination (Practice Quiz)

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#133

Class 11 Biology — Locomotion and Movement (Practice Quiz)

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#134

Class 11 Biology — Excretory Products and their Elimination (Practice Quiz)

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#135

Class 11 Biology — Body Fluids and Circulation (Practice Quiz)

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#136

Class 11 Biology — Breathing and Exchange of Gases (Practice Quiz)

10 Qs · ~10 min

#137

Class 11 Biology — Plant Growth and Development (Practice Quiz)

10 Qs · ~10 min

#138

Class 11 Biology — Respiration in Plants (Practice Quiz)

10 Qs · ~10 min

#139

Class 11 Biology — Photosynthesis in Higher Plants (Practice Quiz)

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#140

Class 11 Biology — Cell Cycle and Cell Division (Practice Quiz)

10 Qs · ~10 min

#141

Class 11 Biology — Biomolecules (Practice Quiz)

10 Qs · ~10 min

#142

Class 11 Biology — Cell: The Unit of Life (Practice Quiz)

10 Qs · ~10 min

#143

Class 11 Biology — Structural Organisation in Animals (Practice Quiz)

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#144

Class 11 Biology — Anatomy of Flowering Plants (Practice Quiz)

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#145

Class 11 Biology — Morphology of Flowering Plants (Practice Quiz)

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#146

Class 11 Biology — Animal Kingdom (Practice Quiz)

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#147

Class 11 Biology — Plant Kingdom (Practice Quiz)

10 Qs · ~10 min

#148

Class 11 Biology — Biological Classification (Practice Quiz)

10 Qs · ~10 min

#149

Class 11 Biology — The Living World (Practice Quiz)

10 Qs · ~10 min

#150

Class 11 Chemistry — Hydrocarbons (Practice Quiz)

10 Qs · ~10 min

#151

Class 11 Chemistry — Organic Chemistry – Some Basic Principles and Techniques (Practice Quiz)

10 Qs · ~10 min

#152

Class 11 Chemistry — Redox Reactions (Practice Quiz)

10 Qs · ~10 min

#153

Class 11 Chemistry — Equilibrium (Practice Quiz)

10 Qs · ~10 min

#154

Class 11 Chemistry — Chemical Bonding and Molecular Structure (Practice Quiz)

10 Qs · ~10 min

#155

Class 11 Chemistry — Classification of Elements and Periodicity in Properties (Practice Quiz)

10 Qs · ~10 min

#156

Class 11 Chemistry — Some Basic Concepts of Chemistry (Practice Quiz)

10 Qs · ~10 min

#157

Class 11 Physics — Waves (Practice Quiz)

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#158

Class 11 Physics — Oscillations (Practice Quiz)

10 Qs · ~10 min

#159

Class 11 Physics — Kinetic Theory (Practice Quiz)

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#160

Class 11 Chemistry — Thermodynamics (Practice Quiz)

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#161

Class 11 Physics — Thermal Properties of Matter (Practice Quiz)

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#162

Class 11 Physics — Mechanical Properties of Fluids (Practice Quiz)

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#163

Class 11 Physics — Mechanical Properties of Solids (Practice Quiz)

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#164

Class 11 Physics — Gravitation (Practice Quiz)

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#165

Class 11 Physics — Systems of Particles and Rotational Motion (Practice Quiz)

10 Qs · ~10 min

#166

Class 11 Physics — Work, Energy and Power (Practice Quiz)

10 Qs · ~10 min

#167

Class 11 Physics — Motion in a Plane (Practice Quiz)

10 Qs · ~10 min

#168

Class 11 Physics — Motion in a Straight Line (Practice Quiz)

10 Qs · ~10 min

#169

Class 11 Physics — Units and Measurement (Practice Quiz)

10 Qs · ~10 min

#170

Class 11 Maths — Trigonometric Functions (Practice Quiz)

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#171

Class 11 Chemistry — Structure of Atom (Practice Quiz)

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#172

Class 11 Physics — Laws of Motion (Practice Quiz)

10 Qs · ~10 min

#173

Business Studies (Class 11) Practice Quiz | CBSE Class 11 Annual Assessment

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#174

Economics (Class 11) Practice Quiz | CBSE Class 11 Annual Assessment

10 Qs · ~10 min

#175

Humanities Subjects Practice Quiz | CBSE Class 11 Annual Assessment

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#176

Motion in a Straight Line Practice Quiz | CBSE Class 11 Annual Assessment

10 Qs · ~10 min

#177

Thermodynamic Processes and Laws Advanced Challenge | CBSE Class 11 Annual Assessment

10 Qs · ~10 min

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