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11.

Which of the following is the most resistant material in pollen grain

  • Sporopollenin

  • Intine

  • Exine

  • Certicle


12.

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.


13.

Phytochrome occurs in two forms. In which form it promotes the germination of seeds of some species ?

  • Pfr forms

  • Pr forms

  • Both forms

  • None of these


14.

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.


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15.

Tetradynamous stamens are found in :

  • Chrysanthemum

  • Zinnia

  • Poppy

  • Brassica


16.

Double fertilization means

  • fusion of nucleus of male gamete with the egg nucleus

  • fusion of two polar nuclei

  • fusion of sperm nucleus with secondary nucleus

  • fusion of one sperm nucleus with nucleus and fusion of other sperm nucleus with secondary nucleus


17.

The formation of embryo without fusion of gametes is termed as :

  • apospory

  • isogamy

  • apogamy

  • syngamy


18.

The plant part which consists of two generations, one within the other, is

  • genninated pollen grain

  • embryo

  • unfertilized ovule

  • seed


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19.

If the pollen tube enters the ovule through funiculus, the phenomenon is known as

  • porogamy

  • chalazogamy

  • mesogamy

  • heterogamy


20.

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.


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