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12th TEST MODEL 2019 (CBSE) |
12th TEST MODEL 2019 (CBSE)
CBSE BOARD EXAM
A. Question carrying 1 Marks:-
1.Write an alternate source of
protein for animal and human nutrition.
2.How does camouflage help an
insect?
3.State a difference between a
gene and an allele.
4.'Man can be primary as well as
secondary consumer'. Justify this statement.
5.Mention the role of Cyano
bacteria as biofertiliser.
B. Question carrying 2 Marks:-
6.(a)How
does a vaccine affect immunity?
(b)How can we get immunization against Polio?
7.Mention the contribution of SL
Miller's experiment to origin of Life.
8.(a)
Expand GIFT and ICSI
(b)Why is ZIFT a boon to childless couples?
9.What is amniocentesis? How is
it misused?
10.Write
the function of each one of the following:-
(a)Fimbriae (b)Oxytocin (c)Seminal vesicle
C. Question carrying 3 Marks:-
11.(a)List any four
characteristic of an ideal contraceptive
(b)Name two intrauterine contraceptive devices that
affects the motality of sperm.
12.What is the functional
differences between B-cells and T-cells.
13.Name
the causative organisms for the following diseases.
(a)Elephantiasis (b)Ringworm(c)Amoebiasis
14.Name and describe any three
cause of biodiversity losses?
15.How
are following used in biotechnology
(a)Plasmid D.N.A (b)Recognition
sequences (c)Gel
electrophoresis.
16.Determination of Biological
oxygen Demond (BOD) can help in suggesting the quality of water body? Explain.
17.Explain the mechanism of 'Sex
determination' in Human. How does it differ from that of Insects.
18.Name any one fowls (domestic
birds) other than chicken reared in poultry farm.
19.Enlist important components of
poultry farm management.
20.A antibody molecule is
represented as H2L2 . Explain.
21.Differentiate between benign
and malignant tumors.
22.Describe endosperm development
in angiosperm.
D. Question carrying 4 Marks:-
23.Community service department
of your school plans a visit to a slum near the school with an objective to
educate the slum dwellers with respect to health and hygine.
(i) Why is there a need to organize such visits?
(ii) Write the steps you will highlight as member of
this department in your interaction with them to enable them to lead a healthy
life.
(iii) What value is shown by your school department?
E. Question carrying 5 Marks:-
24. (a)Explain the
process of spermatogenesis in humans.
‘OR’
(b)Draw a human sperm and label acrosome and middle
piece. Mention their functions.
25. (a)Explain Mendel's
law of independent assortment by taking a suitable example.
‘OR’
(b)How
did Morgan show the deviation in inheritance pattern in Drosophila with
respect to this law?
26. (a) Given below is the
schematic representation of lac operon of E. coli. Explain the functioning of
this operon when lactose is provided in the growth medium of the bacteria.
I
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‘OR’
(b) With the help of diagram show the different steps in
the formation of recombinant DNA by action of restriction endonuclease enzyme
EcoRI.
By- Zoya Rahman (9661394167)
By- Zoya Rahman (9661394167)
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