CBSE Class 12 Biology Sample Paper 2014 Set E

Section A

1. Name the embryonic stage that gets implanted in the uterine wall of a human female

2. Mention the enzyme involved in the continuous replication of DNA strand and the polarity of the template strand

3. Write the scientific name of the microbe used for fermenting malted cereals and fruit juices

4. How can the bacterial DNA be released from the bacterial cell for biotechnology experiments?

5. In which technique do we use Taq polymerase enzyme

6. Name the pests controlled by the proteins encoded by the cry genes

7. Which biome region in the world is considered as the “Lungs of the planet”

8. What is EI Nino effect? 

Section B

9. Of the eight nuclei of the embryo sac in flowering plants three are at the micropylar end. How many are there at the chalazal end and how many nuclei forms the secondary polar nucleus.

10. Mention the role of ribosome in peptide bond formation. How does ATP facilitate it?

11. A non-haemophilic couple was informed by their doctor that there is a possibility of a haemophilic child being born to them, Draw a checker board and find out the percentage of possibility of such a child among the progeny

12. How does Millers experiment support the theory of biochemical origin of life?

13. Why does a doctor administer tetanus antitoxin and not a tetanus vaccine to a child injured in a road side accident with a bleeding wound. Explain

14. How did Eli Lilly synthesize the human insulin? Mention one difference between this insulin and the one produced by the human pancreas

15. A recombinant DNA is formed when sticky ends of vector DNA and foreign DNA join. Explain how the sticky ends are formed and get joined 

16. Justify with the help of an example where a deliberate attempt by humans has led to the extinction of a particular species 

17. How do organisms cope with stressful external environmental conditions which are localised or for short duration.

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