CBSE Class 12 Biology Solved Question Paper 2011

Short Answer Type

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List the key tools used in recombinant DNA technology.

The key tools used in recombinant DNA technology are restriction enzymes, ligases, polymerase enzymes, Polymerase Chain Reaction (PCR), competent host and vectors.
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    Draw a diagram of a male gametophyte of an angiosperm. Label any four parts. Why sporopollenin is considered the most resistant organic material?
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    Write the scientific names of the causal organisms of elephantiasis and ringworm in humans. Mention the body parts affected by them.

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    Differentiate between albuminous and non-albuminous seeds, giving one example of each.

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    Identify A, D, E and F in the diagram of an antibody molecule given below.
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    Justify with the help of an example where a deliberate attempt by humans has led to the extinction of a particular species.
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    Name the two types of immune systems in a human body. Why are cell-mediated and humoral immunities so called?
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    Explain the process of RNA interference.
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    Explain how a hereditary disease can be corrected. Give an example of first successful attempt made towards correction of such diseases.
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    Study the graph given below. Explain how oxygen concentration is affected in the river when sewage is discharged into it.

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