CBSE Class 12 Biology Sample Paper 2014 Set F

Section A

1. Identify the vegetative propagule in the following –

2. A child suffering from Down’s syndrome shows trisomy of 21st chromosome. Mention the cause of this abnormality?

3. State the importance of biofortification. 

4. Very small animals are rarely found in the polar regions. Give reason. 

5. How is the action of exonuclease different from that of an endonuclease? 

6. Name the parts ‘A’ and ‘B’ of the transcription unit given below-

7. Pills are widely accepted as ideal methods of contraception by women. How does it effectively prevent pregnancy? 

8. Why is it desirable to use unleaded petrol in vehicles fitted with catalytic converters? 

Section B

9. Giving two reasons explain why there is more species diversity in the tropics than in the temperate latitudes. 

10. A population 100 spotted deer were living without any carnivores in an enclosure of a few hectares of tropical forest land. The deer census was taken after a few years. Now study the graph given below and answer the questions that follow

a) Identify the curve that represents the deer population.

b) What is this this type of population growth curve called as? What is ‘K’ in the graph? 

11. A person shows a strong immunogenic reaction while exposed to certain substances. Name this condition and the common term for such substances. Mention the cell and the chemical which causes this condition. 

12. How are somatic hybrids produced? 

13. Complete the flow chart of Secondary treatment of effluents in an Effluent treatment

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