Biology Sample Question Paper Sheet - Class Xii, Central Board Of Secondary Education, 2010 Page 4
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39Section - B
9.
Identify the type of flower shown in A and B. Which out of the two will produce an assured seed
set.
10. Fed up of a large family, a couple wanted to adopt a terminal method of contraception. Describe the
process conducted by the doctor in either of the cases (male / female partner)
OR
A mother of a one year old daughter wanted to space her second child. Her doctor suggested CuT.
Explain its contraceptive actions.
11.
The human male and female bird are heterogametic while the human female and male bird are
homogametic. Why are they called so?
12. What are interferons. Explain its role in providing immunity. Also name the kind of immunity pro-
vided by it.
13. What is allergy? Name the antibody responsible for it. Also mention two chemicals released from the
mast cells during an allergic reaction.
14. Give reason -
(a)
Bottled fruit juices bought from the market are clearer as compared to those made at home.
(b)
Large holes are found in “Swiss cheese”.
15. In which parts of the body of the hosts do the following events in the life cycle of Plasmodium take
place. Along with the body parts name the hosts too -
(i)
Fetilisation
(ii)
Development of gametocytes
(iii)
Release of sporozoites
(iv) Asexual reproduction
4
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