J&K Board Biology Model Paper(12th class)

Section A (Zoology)
Max. Marks: 35 Time 1 :30 hrs
Instruction:
                                        SECTION A
Long Answer Type Questions:
1.
Reproduction generally involves two parents. Does it occur uniparently. How? OR
Assisted reproductive techniques bring hope to infertile couples. Explain How.
5Marks
2.
Describe Darwins theory of Natural Selection.
OR
Sex is generally determined by chromosomes of an organism .Does environment also determines sex. Illustrate with examples. 5 Marks SECTION B
Short Answer Type Questions:
3.
What changes occur in the uterus of a human female if the ovum does not receive a sperm? 3 Marks
4.
What phenotypic symptoms are produced in an individual due to trisomy of 21st chromosome? 3 Marks
5.
Match the entries under section A with the choice given under B and C. 3Marks
A B C
a.
Blood and mucus with faeces abdominal pain W. bancrofti Anopheles
b.
Periodic fever followed by sweating, shivering E. histolytica worm
c.
Excessive swelling due to Plasmodium protozoa
blockade of lymph vessels feet and legs
6.
How Genetic engineering helps in producing pest resistant crops? 3 Marks
                                 SECTION C
Short Answer Type Questions:
7.
Draw a labeled sketch of human sperm? 2 Marks
8.
Mention two differences between analogous and homologous organs. 2 Marks
9.
Mention two applications of cloning. 2 Marks
10.
How does DNA fingerprinting helps in detecting a criminal. 2 Marks
SECTION D
Objective Type Questions:
11.
Explain ZIFT. 1 Mark
12.
Write the scientific name of Silk moth. 1 Mark
13.
Name the antibody present in Colostrum. 1 Mark
14.
Human genome is said to have approximately --------------base pairs. 1Mark
15.
Give one example of point mutation. 1 Mark
                                      Section B (Botany)
Max. Marks: 35 
Time 1:30 hrs
                                       SECTION A
Long Answer Type Questions:
1.
How does dominance differ from incomplete dominance? Illustrate with suitable example.
OR
Hershey and Chase conducted an experiment on T2 Phage using radioisotopes.
5 Marks
What were there observations and conclusions?
2.
Define an ecosystem. Write an account of energy flow in an ecosystem.
OR
Major pollutants of air are CO2, SO2 and NO2. What are their sources and harmful effects on human beings and plants? 5 Marks
                                 SECTION B
Short Answer Type Questions:
3.
Vegetative propagation does not lead to variations. Why? 3 Marks
4.
What are GM crops? Give two disadvantages of GM crops? 3Marks
5.
Biofertilizers are better than Chemical fertilizers. Justify? 3 Marks
6.
What is ecological succession? Distinguish between primary and secondary succession. 3 Marks SECTION C
Short Answer Type Questions:
7.
Why cross pollination cannot occur in cleistogamous flowers. 2 Marks
8.
What do you mean by degeneracy of genetic code? 2Marks
9.
How many phosphorus atoms are there in a DNA double helix having 10,000base pairs? 2 Marks
10.
An orchid plant grows on the branch of a mango tree. Give the interaction between the two. 2 Marks
                    SECTION D
Objective Type Questions:
11.
Define apomixis? 1 Marks
12.
How many cells are there in a typical angiospermic embryo sac? 1 Marks
13.
Define totepotency? 1Marks
14.
Which type of ecological interaction is represented in lichens? 1Marks
15.
What are schiophytes? 1Marks


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