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CBSE Class 12 Biology Solved Question Paper 2015

Short Answer Type

11. List any four techniques where the principle of ex-situ conservation of biodiversity has been employed.

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12.

State what is apomixis. Comment on its significance. How can it be commercially used?

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13.

During a monohybrid cross involving a tall pea plant with a dwarf pea plant, the offspring populations were tall and dwarf in equal ratio. Work out a cross to show how is it possible.

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14. Explain the significance of satellite DNA in DNA fingerprinting technique.

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15.

What does the following equation represent? Explain
p² + 2 pq + q² = 1

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16.

A heavily bleeding and bruised road accident victim was brought to a nursing home. The doctor immediately gave him an injection to protect him against a deadly disease.

(a) Write what did the doctor inject into the patient's body.
(b) How do you think this injection would protect the patient against the disease?
(c) Name the disease against which this injection was given and the kind of immunity it provides.

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17.
Enumerate any six essentials of good, effective Dairy Farm Management Practices.

Six essentials of good, effective Dairy Farm Management Practices are:

1. Selection of the breeds that have high-yielding potential land having resistant to diseases.
2. Proper housing, adequate food and water supply.
3. Periodic visit by a veterinary doctor for the good health of cattle.
4. Quantity and quality of the fodder should be good.
5. Stringent cleanliness and hygiene should be maintained while milking, storage and transport of the milk and its products.
6..Regular inspection of the dairy farm to identify and rectify any problems.

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18. State the medicinal value and the bioactive molecules produced by Streptococcus, Monascus and Trichoderma.

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19.

What are methanogens ? How do they help to generate biogas?

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20.

Rearrange the following in the current sequences to accomplish an important biotechnological reaction :

(a) In vitro synthesis of region of DNA of interest
(b) Chemically synthesized oligonucleotides
(c) Enzyme DNA-polymerase
(d) Complementary region of DNA
(e) Genomic DNA template
(f) Nucleotides provided
(g) Primers
(h) Thermostable DNA-polymerase (from Thermus aquaticus)
(i) Denaturation of ds-DNA

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