CBSE Class 12 Biology Question Paper 2015 Outside Delhi Set 3 with Answers (Reval)

CBSE Class 12 Biology Question Paper 2015 Outside Delhi Set 3 with Answers (Reval). Students can download the last year question papers using the link below. Free download of examination question papers with solutions.Last 10 year question papers should be practised to get better marks in examinations.

SECTION A

1. What is a cistron ?

2. How many chromosomes do drones of honeybee possess ? Name the type of cell division involved in the production of sperms by them.

3. List two advantages of the use of unleaded petrol in automobiles as fuel.

4. Retroviruses have no DNA. However, the DNA of the infected host cell does possess viral DNA. How is it possible ?

5. Suggest any two possible treatments that can be given to a patient exhibiting adenosine deaminase deficiency.

SECTION B

6. Select two pairs from the following which exhibit divergent evolution.

Give reasons for your answer.

(i) Forelimbs of cheetah and mammals

(ii) Flippers of dolphins and penguins

(iii) Wings of butterflies and birds

(iv) Forelimbs of whales and mammals

7. A liverwort plant is unable to complete its life-cycle in a dry environment. State two reasons.

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