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
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