Biology Sample Question Paper Sheet - Class Xii, Central Board Of Secondary Education, 2010 Page 28
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39SAMPLE PAPER III
XII - BIOLOGY
Time : 3 Hours
Max. Marks : 70
GENERAL INSTRUCTIONS :
1.
All questions are compulsory.
2.
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.
3.
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.
4.
Wherever necessary, the diagrams drawn should be neat and properly labelled.
SECTION - A
1.
Cite an example of an inverted ecological pyramid. What kind of pyramid of energy would it have?
1
2.
When is the structure and composition of a community expected to remain unchanged?
1
3.
At what stage of life is oogenesis initiated in a human female? When does the oocyte complete
oogenesis?
1
4.
After a successful in-vitro fertilisation, the fertilised egg begins to divide. Where is this egg transferred
before it reaches the 8-cell stage and what is this technique named?
1
5.
AaBb was crossed with aabb. What would be the phenotypic ratio of the progeny? Mention the
term to denote this kind of cross.
1
6.
In F.Griffith’s experiment, how did the nonvirulent strain of Streptococcus Pneumoniae become
virulent?
7.
State the use of :
(i)
Trichoderma with respect to organ transplant, and
(ii)
Nucleopolyhedrovirus with respect to pest management
1
8.
Bacteria that convert milk into curd play two other beneficial roles. What are they?
SECTION B
9.
Given below is a graph depicting organismic response to changing external conditions. According
to their re-sponse the organisms are grouped into two types. Name the type which will show (i)
pattern A and (ii) pattern B.
2
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