Biology Sample Question Paper Sheet - Class Xii, Central Board Of Secondary Education, 2010 Page 3
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39SAMPLE QUESTION PAPER
XII- BIOLOGY
(2010)
Time : 3 Hrs
MM: 70
General Instructions :
(i)
All questions are compulsory.
(ii) This question paper consists of four Sections A, B, C and D. Section A contains 8
questions of one mark each, Section B is of 10 questions of two marks each, Section
C is of 9 questions of three marks each and Section D is of 3 questions of five 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.
The turkey usually produces females for several generations. How is this possible?
2.
The meiocyte of an onion plant contains 32 chromosomes. Workout the number of chromosomes
found in its endosperm.
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 ?
4.
Pick out the ancestral line of Cycads from the list given below -
Ferns, herbaceous lycopods, seed ferns, and horsetails
5.
Name the source of smack. Mention one way in which it affects the human body.
6.
In plants, how is alien DNA introduced into the host cell ?
7.
Mr. Galgotia eats curd / yoghurt. In this case, which trophic level will he occupy?
8.
In the absence of the predators, which curve, a) or (b) would appropriately depict the prey popula-
tion ?
3
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