Biology Question Paper 2007 

Sample Paper – 2007
Class – XII
Science (CBSE) Biology

Instructions
All questions are compulsory.
Section A has five questions of 1 mark each. Word limit is 10 words.
Section B has ten questions of 2 marks each. Word limit is 30 words.
Section C has ten questions of 3 marks each. Word limit is 50 words.
Section D has ten questions of 5 marks each. Word limit is 70 words.

1 What does P wave in an electrocardiogram represent

2 What is colustrum?

3 What is spermatogenesis?

4 Five two reasons of immunodeficiency.

5 What is epiglottis?


SECTION B

6 Define R.Q. and give its value for fats and carbohydrates.

7 What are the roles of nitrogenase and leghaemoglobin.

8 Give any two types of joints and write examples too.

9 What is bioethics?

10 Draw a well labeled diagram of human urinary system?

OR

Draw a well labeled diafram of pollen grain.

11 What is trachea?

12 Explain comouflage and mimicry.

13 What is demographic transition?

14 Explain the process of dialysis.

15 Explain parthenocarpy. Give example of both parthenogenesis and parthenocarpy.

SECTION C

16 Describe photorespiration and steps of photorespiratory pathway.

17 Explain the role of haemoglobin in carbon dioxide transportation.

18 Describe with diagram the counter current system and vasa recta.

19 Differentiate between ethylene and abscic acid.

20 How are terms ecotone edge species and edge effect related?

OR

Explain the nitrogen cycle.
21 Explain wear and tear theory of death.

22 Explain Rh factor.

23 What are various zones of a lake?

24 Write the functions and glands of PRH, FSH,ICSH.

25 Explain inflammatory barriers.

SECTION D

26 Describe opening and closing of stomata. What is the role of K+ ions?

OR

Describe factors affecting transpiration and explain the process.

27 Draw a diagram of human heart and label any four plants. Describe the flow of blood.

OR

Explain the human male reproductive system

28 What are carcinogens? Explain the four categories of cancer.

OR

What is the principle of PET imaging? Explain the process and uses.