Biology (Sample Papers XII 2009) – CBSE

  CBSE You are here

SAMPLE QUESTION PAPER-I

XII – BIOLOGY

Time : 3 Hours Max.                             Marks : 70

GENERAL INSTRUCTIONS :

(i) All questions are compulsory.

(ii) The 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 whereas Section D

is of 3 questions of 5 marks each.

(iii) 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 weightage. A student has to attempt only one of

the alternatives in such questions.

(iv) Wherever necessary, the diagrams drawn should be neat and properly labelled.

SECTION – A

1. Why do internodal segments of sugarcane fail to propagate vegetatively even when they are in contact with damp soil?                     1

2. Mention any two probable reasons for rapid rise of population in our country from about 350 million at the time of independence to about 1 billion by the year 2000.                                            1

3. 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?             1

4. State any one reason to explain why RNA viruses mutate and evolve faster than other viruses.                                    1

5. Mention any two measures for prevention and control of alcohol and drug abuse among adolescents.                             1

6. What would be the impact on the environment around a thermal power plant if its electrostatic precipitator stops functioning? Give a reason.         1

7. Why is thermoregulation more effectively achieved in larger animals than in smaller ones?                                     1

Note:For whole post Download attached PDF



  « Accountancy (Sample Papers XII 2009) – CBSE Chemistry (Sample Papers XII 2009) – CBSE »  

  Posted on Friday, January 2nd, 2009 at 1:18 PM under   CBSE | RSS 2.0 Feed