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Sample Question Paper
Class XII (2015-16)
Biology (044)
Time allowed: 3 Hrs
Maximum Marks: 70
General Instructions:
1
...
All questions
are compulsory
...
Section A contains question number 1 to 5, Very Short Answer type questions of one
mark each
...
Section B contains question number 6 to 10, Short Answer type I questions of two
marks each
...
Section C contains question number 11 to 22, Short Answer type II questions of three
marks each
...
Section D contains question number 23, Value Based Question of four marks
...
Section E contains question number 24 to 26, Long Answer type questions of five
marks each
...
There is no overall choice in the question paper; however, an internal choice is
provided in one question of two marks, one question of three marks and all three
questions of five marks
...
SECTION -A
1
...
(b)
Give an example of a disease in human beings which shows such a pattern of
inheritance
...
Identify the reason for selection of DNA polymerase from Thermus aquaticus for
Polymerase Chain Reaction
...
Govt
...
Suggest any two more measures adopted by Government for the purpose
...
Thymus of a new born child was degenerating right from birth due to a genetic disorder
...
[½ + ½=1]
5
...
[1]
SECTION -B
6
...
Analyse the properties of pollen grains which help in the fossilization
...
Protein synthesis machinery revolves around RNA but in the course of evolution it was
replaced by DNA
...
[2]
8
...
OR
[1+1=2]
Keeping beehives in crop fields has several advantages
...
[1+1=2]
9
...
Quality of the fruit was excellent but the yield
suffered due to infection of the plants by a virus
...
Justify the selection of your method
...
Besides acting as ‘conduits’ for energy transfer across trophic levels, predators play other
important roles
...
[2]
SECTION -C
11
...
12
...
Identify the
tissues involved and justify their role
...
Compare the two ecological pyramids of biomass given below and explain the situations in
which this is possible
...
[1+2=3]
14
...
[1+1+1=3]
(a)
Identify the method used to distinguish between heavy and light isotopes of
nitrogen
...
[1+2=3]
A student was simulating Urey and Millers experiment to prove the origin of life
...
(a)
Find out the reasons why he could not get desired results
...
[1+1+1=3]
Given below is a figure of a biogas plant
...
(b)
Identify the products B and C and discuss their significance
...
According to Global Hunger Index 2014 two billion people suffer from hidden hunger
...
Specify four objectives of the programme
...
[½ +2+½=3]
18
...
What is this change called in technical terms?
Describe the experimental evidences which led to the discovery of the above phenomenon
...
When someone buys packets of cigarettes, cannot miss the statutory warning that is present
on the packing which warns against smoking and says how it is injurious to health
...
Advise the
adolescents about the importance of avoiding smoking
...
)
[½x6= 3]
20
...
Explain the technique
adopted along with its mode of action
...
(a)
Given below is a single stranded DNA molecule
...
5’ ATGGGGCTC 3’
(b)
sense
How the RNA molecules made from above DNA strand help in silencing of the
specific RNA molecules?
[2+1=3]
22
...
Given below is the sketch of
the observations of the experiment performed by him
...
(c)
Elaborate the step he would have followed to visualize DNA bands
...
Mohit and Sumit want to buy a new car for their company
...
C but relatively low mileage
...
(b)
What qualities of personality are being exhibited by Mohit in doing so?
(c)
Suggest two more measures which can help in reducing vehicular pollution
...
Human female is not fertile after menopause whereas males can produce gametes at any
age after puberty
...
[5]
OR
A village health worker was taking a session with women
...
Wrong usage can actually
promote conception
...
(b)
25
...
Justify the use explaining the mode of action of IUDs
...
(b)
Under certain conditions repressor is unable to attach at this site
...
(c)
If repressor fails to attach to the said site what products will be formed by z, y and
a?
(d)
Analyze why this kind of regulation is called negative regulation
...
Justify and
compare the initiation, elongation and termination in bacterial cells with eukaryotes
...
The graph below shows species –area relationship:
(A)
(B)
If b denotes the relationship on log scalei)
Describe a and b
...
iii)
What kind of slope will be observed for frugivorous birds and mammals in a
tropical forest?
Species diversity of plants (22%) is much less than that of animals (72%)
...
[3+2=5]
OR
(a)
(b)
Which of the above represents the increase or decrease of population?
If N is the population density at time t, then what would be its density at time (t+1)?
Give the formula
...
5 more rats enter the barn and 6 out of the total rats
were eaten by the cats
...
If a new habitat is just being colonized, out of the four factors affecting the
population growth which factor contributes the most?
[1+1+2+1=5]
***