Tamil Nadu Class 11 Biology Model Question Paper 2 — Samacheer Kalvi

Instructions

• Time: 3 hours | Max Marks: 70
• Part I: Answer all 15. | Part II: Answer any 6 of 8.
• Part III: Answer any 9 of 12. | Part IV: Answer any 5 of 7.

Part I — 1 Mark (Answer All)

1. Name the enzyme in saliva. 2. What is erythroblastosis foetalis? 3. Name the photoreceptor pigment for photoperiodism. 4. Where does the Krebs cycle occur? 5. What is the residual volume of lungs? 6. Name the gas released during light reactions of photosynthesis. 7. Which plant hormone delays senescence? 8. Name the protein that carries oxygen in blood. 9. What is a taxon? 10. Name the reserve food material in red algae. 11. Which step of urine formation requires active transport for glucose? 12. What is the P wave in an ECG? 13. Name a free-living nitrogen-fixing cyanobacterium. 14. What is the role of surfactant in alveoli? 15. How many ATP are produced by meiosis?

Answer Key: 1. Salivary amylase (Ptyalin) 2. Rh incompatibility disease in newborn 3. Phytochrome 4. Mitochondrial matrix 5. 1200 mL 6. Oxygen 7. Cytokinin 8. Haemoglobin 9. A unit of classification 10. Floridean starch 11. Tubular reabsorption (PCT) 12. Atrial depolarisation 13. Nostoc 14. Reduces surface tension; prevents alveolar collapse 15. 0 ATP (meiosis is a division process, not energy synthesis)

Part II — 2 Mark Questions (Answer any 6)

1. Differentiate between genotype and phenotype (relevance to classification). 2. What is vital capacity? Write its formula. 3. Define: (a) GFR (b) Micturition. 4. What is the fluid mosaic model? 5. Differentiate between short-day and long-day plants with examples. 6. Name four accessory glands of the human digestive system and their secretions. 7. What is vernalisation? Give one example. 8. State two differences between prokaryotic and eukaryotic cells.

Part III — 3 Mark Questions (Answer any 9)

1. Explain the ABO blood group system — antigen, antibody, donor, recipient. 2. Describe osmosis and explain turgor pressure and plasmolysis. 3. Explain glycolysis and its net ATP yield. 4. Compare bryophytes and pteridophytes (three points). 5. Describe the mechanism of inspiration and expiration. 6. Explain the roles of ADH and aldosterone in urine formation. 7. Describe the cell cycle with stages and events. 8. What are the functions of WBCs? Name five types. 9. Explain the pressure flow hypothesis of phloem transport. 10. Describe the structural features of arthropoda. 11. List the five types of plant growth regulators and one function each. 12. What is photosynthetic pigment diversity? Name the pigments and wavelengths.

Part IV — 5 Mark Questions (Answer any 5)

1. Describe the structure and functions of the chloroplast. Explain the Calvin cycle. 2. Explain the human circulatory system — heart structure, cardiac cycle, and ECG. 3. Describe the digestive system from mouth to small intestine with enzymes. 4. Explain cell division — mitosis stages with events and significance. 5. Describe the structure of a kidney and the process of urine formation with hormonal control. 6. Compare the five major plant groups (algae to angiosperms) in a table. 7. Describe the mechanism of breathing and explain the transport of gases.

Score Sheet for Self-Assessment

Target: Score above 56/70 (80%) before the exam.