Q10 of 57 Page 77

A farmer has two fields A and B. He cultivates peas (Pisumsativum) in both the fields.

Field A is covered with nets to keep out birds and insects. Field B is left uncovered.


i) Name the type of pollination that would occur in field ‘A’ and field ‘B’


ii) Which of these fields will give a higher yield?


iii) To raise the next crop, from which field should the seeds be chosen by the farmer.


Give reason to support your answer.


- (i) Pollination in field ‘A’ Self-pollination.

Pollination in field ‘B’ Cross-pollination.


(ii) Field B will have higher yield as it has cross-pollination. Peas generally have cross pollination for transfer of pollen.


(iii) Farmer should use seeds from field B because it may have some new varieties and also seeds will be more viable because of cross-pollination.


The diagram for cross pollination and self pollination is shown below:




More from this chapter

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8

Look at the diagram given below:


Answer the following:


i) Name the method of reproduction depicted here.


ii) Name an organism in which you find this method of reproduction.


iii) Does this method of reproduction favour variation?


 9

Imagine you have a garden with the plants listed below. A swarm of bees visits your garden. Do you think the bees will visit all the flowers? Name the flowers which you think the bees will be attracted to. Give reasons to substantiate your answer.

(Jasmine, Nerium, Gulmohar, Rose, Lotus, Corn, Sugarcane, Bamboo, Chrysanthemum, Dahlia, Grass, Coconut, and Peas)


 11

Mango and Coconut are both drupes. The mesocarp of mango is edible, while it is not so in coconut. Based on this fact, answer the following:

i) Which part of the coconut is edible?


ii) Why does the coconut have a fibrous mesocarp?


iii) Can you mention any other use of the fibrous mesocarp?


 12

Group the following under the given heads: (a) fruit (b) seed (c) neither fruit nor seed.

tomato, cucumber, sprouted pulses, naked bean, grapes, celery, potato, sugarcane, apple, runner bean.