Tamil Nadu Class 11 Biology Question Bank — Samacheer Kalvi
Comprehensive Class 11 Biology question bank for Tamil Nadu board: chapter-wise 1-mark, 3-mark, and 5-mark questions with answer hints for Samacheer Kalvi.
Updated 11 May 20263 min read
Chapter 1 — Living World
5 Mark: Describe Whittaker's five-kingdom classification with examples.
5 Mark: Describe characteristics of bryophytes with examples.
1 Mark: Which group is called amphibians of plants?
Name dominant phase in pteridophytes.
3 Mark: Compare gymnosperms and angiosperms.
List three uses of algae.
Chapter 3 — Animal Kingdom
5 Mark: Describe the basis of animal classification with a table of invertebrate phyla.
1 Mark: Largest phylum in Animalia?
Name three chordate features.
Define coelom.
3 Mark: Features of Arthropoda.
Compare Aves and Reptilia.
Chapter 4 — Cell: Unit of Life
5 Mark: Structure and function of cell organelles (any five).
1 Mark: Powerhouse of cell?
Where are 70S ribosomes found in eukaryotes?
Suicide bags?
3 Mark: Fluid mosaic model.
Prokaryotic vs Eukaryotic comparison.
Chapter 5 — Cell Division
1 Mark: What occurs in S phase?
Stage where chromosomes align at equator?
What is crossing over?
3 Mark: Compare mitosis and meiosis.
Prophase I sub-stages.
5 Mark: Describe mitosis PMAT with diagrams.
Explain meiosis I.
Chapter 6 — Transport in Plants
5 Mark: Cohesion-tension theory of ascent of sap.
1 Mark: Define osmosis.
What is plasmolysis?
Name cohesion-tension theory proposers.
3 Mark: Apoplast vs Symplast pathways.
Explain pressure flow hypothesis.
Chapter 7 — Mineral Nutrition
5 Mark: Describe biological nitrogen fixation with organisms and steps.
1 Mark: Free-living N₂-fixing bacterium?
What is chlorosis?
Which element is in chlorophyll?
3 Mark: Deficiency symptoms: N, Fe, Ca.
Nitrogen cycle steps.
Chapter 13 — Photosynthesis
1 Mark: Where does Calvin cycle occur?
Enzyme fixing CO₂ in Calvin cycle?
First stable product in C3 plants?
3 Mark: C3 vs C4 comparison.
Products of light reactions.
5 Mark: Describe Calvin cycle.
Explain light reactions (PS II, ETC, PS I).
Chapter 14 — Respiration
1 Mark: Where does glycolysis occur?
Final electron acceptor in aerobic respiration?
3 Mark: Differentiate aerobic and anaerobic respiration.
Krebs cycle products per turn.
5 Mark: Describe glycolysis.
Explain ETC and chemiosmosis.
Chapter 16 — Digestion and Absorption
1 Mark: Function of HCl in stomach?
Where is maximum absorption?
What does bile do?
3 Mark: Role of pancreatic juice.
How are fats absorbed?
5 Mark: Describe digestion of proteins.
Draw and explain digestive system.
Chapter 17 — Breathing
1 Mark: Tidal volume?
Which enzyme helps CO₂ transport?
Most CO₂ transported as?
3 Mark: Explain respiratory volumes (at least four).
O₂ transport mechanisms.
5 Mark: Mechanism of breathing.
Explain ETC applied to O₂-Hb dissociation.
Chapter 18 — Circulation
5 Mark: Describe the cardiac cycle with ECG and heart sounds.
1 Mark: Universal blood donor?
What does QRS represent?
Define cardiac output.
3 Mark: ABO blood groups table.
Cardiac cycle phases.
Chapter 19 — Excretion
1 Mark: GFR value?
ADH role?
What is the functional unit of kidney?
3 Mark: Three steps of urine formation.
Role of ADH and aldosterone.
5 Mark: Nephron structure + urine formation.
Describe hormonal regulation of urine.
Frequently Asked Questions
Cardiac cycle, nephron structure, photosynthesis (C3/C4 comparison), digestive enzymes table, and plant hormone functions appear in almost every year's paper.
