Q8 of 26 Page 1

Write the scientific name of the common species of honey-bees found in India. Mention any two benefits of keeping bee-hives in crop fields during flowering periods.

The scientific names of the common species of honey-bees found in India are ‘Apis indica’, ‘Apis Dorsata’, etc.

Bees are the pollinators of many crop species like sunflower, Brassica, apple and pear.


The benefits of keeping beehives in crop fields during flowering period are:


i. It increases pollination efficiency


ii. It improves the yield i.e., both crop yield and honey yield.


More from this chapter

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6

Why are researchers the world over, trying to transfer ‘apomictic’ genes into hybrid seeds? Give reasons (any two).

 7

Mention any two situations in which the use of DNA fingerprinting is necessary.

OR


Explain pleiotrophy with the help of an example.


 9

Mention the type of immunisation — active or passive, that should be provided for each of the following:

(i) Prevention of tuberculosis in young children


(ii) Prevention of tetanus in a person injured in a road accident


Give reason in support of your answer.


 10

(a) Write the conditions under which ‘J’ and ‘S’ shaped growth related population curves are observed.

(b) In a bacterial culture, which one of the growth curves mentioned above would be observed first and why?