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Directional Academy
1
Class 12 Biology Solved Paper
Time: 3 Hours
Total Marks: 70
General Instructions:
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1
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2
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Section A contains 5
questions of one mark each, Section B is of 5 questions of two marks each, Section C
is of 12 questions of three marks each, Section D is of 1 question of four marks and
Section E is of 3 questions of five marks each
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There is no overall choice
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A student has to attempt only one of the alternatives in such questions
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Wherever necessary, the diagrams drawn should be neat and properly labelled
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What is the main function of gel electrophoresis?
[1]
3
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Name two lymphoid organs
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Why is Gambusia introduced into drains and ponds?
[1]
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1
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In a cross between a black and a white guinea pig, all F1 members are black
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[2]
(a) What are the possible genotypes at each level?
(b) What will the offspring be like if two F2 whites are mated?
8
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If tall and red flower (heterozygous) for both
characters is crossed with dwarf and white flower, then what will be the
probability of the offspring?
[2]
9
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[2]
Mention any two symptoms of AIDS
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Name two commonly used bioreactors
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[2]
Section C
11
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What is ovulation? What happens to the Graafian follicles after ovulation?
[3]
13
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On selfing, these plants produced
470 plants with purple flowers and 162 with white flowers
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What acts as an inducer in lac operon? How does it switch on the operon?
15
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[3]
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(a) Is this representation indicating a normal human or a sufferer from a certain
related genetic disease? Give reason in support of your answer
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Name the pathogen, vector and symptoms of the disease Elephantiasis (Filariasis)
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(a) Explain how to overcome inbreeding depression in cattle
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(c) Name an improved breed of cattle
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How are red algae more successful to live in deep water?
[3]
20
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Do eukaryotic cells have restriction endonucleases? Justify you answer
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What are the effects of noise pollution?
[3]
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22
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Give an example of the first
successful attempt made towards correction of such diseases
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Anand, a 14-year-old boy, thinks smoking makes him more energetic and feels like
an adult and thus a more responsible citizen
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As a friend, you have to educate him on
[4]
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(a) Why he feels more energetic while smoking
(b) The effects of CO in smoke
(c) Other ill effects on the body
(d) What values are reflected here?
Section E
24
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S
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[5]
OR
What are the major functions of male accessory ducts and glands?
25
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[5]
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OR
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Write the full names of the different types of RNA
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26
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Explain the simplified model of the
carbon cycle in nature
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Ans
Banana is an underground modified stem (rhizome)
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It is recognised by its well-marked nodes and internodes
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2
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3
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It
is self-replicating and carries the genes for sex factor or fertility factor
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Ans
Spleen and tonsils
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5
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So, it is introduced into drains
and ponds
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Ans
Syngamy is the fusion of male and female gametes
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The term syngamy means ‘fusion of gametes’ and describes the event which occurs
when two gametes of opposite sexes come close to each other and fuse
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7
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The genotype at the F2
level will be BB, Bb, Bb, bb
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8
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Tall and Red × Dwarf and White
Genes
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TR, Tr, tR, tr × tr
These gametes fuse as follows:
Tr
Ttrr
(Tall plant
with white
flowers)
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tr
TR
TtRr
(Tall plant with
red flowers)
tR
ttRr
(Dwarf plant
with red
flowers)
tr
Ttrr
(Dwarf plant
with white
flowers)
Result: 1:1:1:1
Dir
9
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It generates heat which
results in fever
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OR
Symptoms of AIDS:
(i) Swollen lymph nodes and fever
(ii) Sweating at night and weight loss
10
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The importance of using bioreactors is
(i) It provides large volume for cultures
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(ii) It also provides the optimal conditions for achieving the growth of the desired
product such as temperature, pH, vitamins and oxygen
...
Ans
Significance of parthenogenesis:
(i) It helps in determining the sex of an animal as in honey bee
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(iii) It rapidly increases the number of animals in a population
...
Ans
Ovulation: It is the process of release of the mature ovum from the ovary in the
abdominal cavity
...
The corpus luteum secretes progesterone