CBSE Sample Paper

Biology 2009

Class XII

 

Section A (1-marks)

1. Name any two  metals which are used as catalyst in catalytic converter?
2. State any one reason to explain why RNA viruses mutate and evolve faster than other viruses.
3. Which Mendel’s law of inheritance is universally acceptable and without any exception? State the law.
4. What is immunosuppressant? Give example
5. The gene I that controls the ABO blood grouping in human beings has three alleles IA, IB and i

(a) How many different genotypes are likely to be present in the human population?

 

(b) Also, how many phenotypes are possibly present?

   6.Why is thermoregulation more effectively achieved in larger animals than in smaller ones?

 

   7.Distinguish between chasmogamous and cleistogamouus flowers?

   8. Which is the first diploid cell which begins life ?

 

Section B (2-marks)

 

   9.Do you think that friends can influence one to take alcohol/drugs? How can you protect yourself from such influence?

  10. Which one out of the eurythermal or stenothermal species is likely ot survive increased global temperatures? Give one reason for your answer.

 

  11.Why does a beekeeper keep beehives in crop fields during the flowering periods? State any two advantages.

  12. Briefly explain the Gel Electrophoresis? Mention its significance?

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