Tamilnadu Board Class 12 Botany Sample Papers 2011

XII – BOTANY

SAMPLE PAPER

1. What is type specimen?

2. Write the botanical names of any two medicinal plants of Asteraceae and state their uses.

3. Write a note on androecium of Schizanthus pinnatus.

4. Draw the floral diagram of disc floret of Tridax and write its floral formula.

5. Write any three anatomical differences between gymnosperm and angiosperm.

6. What is genome?

7. Write any three significance of crossing over.

8. Write three sentences about genetic code.

9. Define recombinant DNA.

10. How is cell wall removed from intact cells by enzymes?

11. Define energy of activation.

12. Differentiate PS I from PS II.

13. What is photolysis of water?

14. Under what conditions does cyclic electron transport take place?

15. Write the overall reaction of glycolysis.

16. What is electron transport chain with reference to respiration? State its significance.

17. Define respiratory quotient. What is the respiratory quotient value of glucose?

18. What is bolting?

19. Explain genetically modified organisms in biological warfare.

20. Write any three economic importance of groundnut.

21. Bring out any five salient features of ICBN.

22. Write the economic importance of the family Rubiaceae.

23. Describe xylem tissue.

24. Draw the internal structure of monocot leaf and label the parts.

25. Describe the vascular tissue system.

26. Draw the structure of Watson and Crick model of DNA and label the parts.

27. Write any five significance of ploidy.

28. State the applications of tissue culture.

29. Write the most important events of recombinant DNA technology.

30. Explain sigmoid growth curve.

31. Explain Fischer's Lock and Key theory of enzyme action.

32. Discuss the benefits of biofertilizers.

33. Describe Cocos nucifera in botanical terms.

34. a. Write a note on economic importance of Fabaceae.(5 Marks)
b. Differentiate the androecium and gynoecium of Malvaceae to that of Rubiaceae.(5 Marks)

35. Describe the anatomy of monocotyledonous stem.

36. Explain the central dogma of molecular biology.

37. Describe the various steps involved in protoplasmic fusion.

38. Explain various steps involved in Calvin cycle.

39. a. Describe the experiment to demonstrate the liberation of carbon dioxide during
   respiration.  (5 Marks)
b. Write the significance of pentose phosphate pathway.

40.What is sustainable agriculture? Describe its role in modern agricultural practices.