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 Multiple Choice QuestionsMultiple Choice Questions

141.

Assertion : Vegetable oils are fats which are present in plant cells in soluble form.

Reason : Vegetable oils occur only in cells of embryo.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


142.

Plants of which one of the following groups of genera arc pollinated by the same agency

  • Triticum, Cocos, Mangifera

  • Ficus, Kigelia, Casuarina

  • Salvia, Morus, Euphorbia

  • Bombax, Butea, Bauhinia


143.

In which one of the following would you expect to find glyoxysomes?

  • Endosperm of wheat

  • Endosperm of castor

  • Palisade cells in leaf

  • Root hairs


144.

Double fertilization involves

  • fertilization of the egg by two male gametes

  • fertilization of two eggs in the same embryo sac by two sperms brought by one pollen tube

  • fertilization of the egg and the central cell by two sperms brought by different pollen tubes

  • fertilization of the egg and the central cell by two sperms brought by the same pollen tube.


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145.

The pollen tube usually enters the embryo sac

  • through one of the synergids

  • by directly penetrating the egg

  • between one synergid and central cell

  • by knocking off the antipodal cells.


146.

Assertion: Insects visit flowers to gather honey.

Reason: Attraction of flowers prevents the insects from damaging other parts of the plant.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If both Assertion and Reason are false.


147.

Pollen grains are able to withstand extremes of temperature and dessication because their exine is composed of

  • cutin

  • suberin

  • sporopollenin

  • callose


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148.

Assertion: Coconut tree is distributed in coastal areas over a large part of the world.

Reason: Coconut fruit can float and gel dispersed over thousands of kilometers before losing viability.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If both Assertion and Reason are false.


A.

If both Assertion and Reason are true and Reason is the correct explanation of Assertion

Coconut requires the hot and wet climate hence it is grown in coastal areas. It is widely grown in coastal and deltic regions of tropical and subtropical countries. Coconut fruit shows hydrochory i.e. the dispersal takes place through water medium. Being the inhabitant of coastal area the fruit is so adapted that it can float and get dispersed over thousands of kilometers before losing viability.


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149.

When the pollen tube enters through the micropyle, it is termed as

  • chalazogamy

  • mesogamy

  • porogamy

  • none of these


150.

For self pollination, flower must be

  • unisexual

  • bisexual

  • monosexual

  • asexual


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