Sample Paper – 2008

Class – XII

Subject – Biology

General Instructions:

1. All questions are compulsory.

2. This question paper consists of four Sections A, B, C and D. Section -A contains

8 questions of 1 mark each, Section -B is of 10 questions of 2 marks each,

Section -C has 9 questions of 3 marks each and Section D is of 3 questions of 5 marks each.

3. There is no overall choice .However, an internal choice has been provided

in one question of 2 marks, one question of 3 marks and all the three questions of

5 marks. Attempt only one of the choices in such questions.

4. Wherever necessary, the diagrams drawn should be neat and properly labelled.


1. What is the Ploidy of PEN ? [1]

2. A human zygote has XXY sex chromosomes along with 22 pairs of autosomes

What sex will the individual be? [1]

3. Expand FOAM. What is its significance? [1]

4. Which enzyme is known as ‘molecular scissors’? [1]

5. Name the Ecological pyramid that can be inverted in Tree ecosystem. [1]

6. Explain the term emasculation. When and why does a plant breeder employ [1]

this technique

7. Why is cow dung used in generation of Biogas? [1]

8. Name two animals each that are (i)Oviparous (ii) Viviparous. [1]


9. What are sacred groves ? What is their role in Biodiversity conservation? [2]

10. Mention the advantages of selecting Pea plant for experiment by Mendel. [2]


Why does Mendel’s work gone unnoticed?

11. What measures would you take to prevent water borne disease? [2]

12. What are the disadvantages of human use of Insulin from other animal sources?[2]

13. Name the diseases diagnosed by (a)WIDAL test (b)ELISA test [2]

14. What is Biological Magnification ? [2]

15. Differentiate between Geitonogamy and Allogamy. [2]

16. If the sequence of coding strand in a transcription unit is written as follows : [2]


Write the sequence of mRNA

17. Name...