Q8 of 42 Page 1

Explain the relationship between B-lymphocytes and T-lymphocytes in developing an immune response.

The immune responses ( reaction towards any foreign particle entering in the blood stream) i.e. primary ( it occurs when there is first contact with any antigen) and secondary are carried out by B and T lymphocytes

B lymphocytes produces antibodies which fights with any foreign or toxic particles entering in the blood


T lymphocytes ( helper cells) helps B cells to produce antibodies



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(a) List any two characteristic features of wheat flowers that make it a good example of wind pollination.

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Why has the Indian Government set up the organization named GEAC?Give any two reasons.

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What is ‘Ori’? State its importance during cloning of a vector.

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Explain the importance of ‘selectable marker’, with the help of a suitableexample.