Write the scientific names of the causal organisms of elephantiasis and ringworm in humans. Mention the body parts affected by them.

Elephantiasis:

Casual organism: Wuchereria bancrofti

Body part affected: Lymphatic vessels of lower limbs

Ringworm:

Casual organism: Belong to the genus Microsporum, Trichophyton, and Epidermophyton

Body part affected: Skin

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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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Identify A, D, E and F in the diagram of an antibody molecule given below.

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

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List the key tools used in recombinant DNA technology.

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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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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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CBSE Class 12 Biology Solved Question Paper 2011