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

• chalazogamy

• mesogamy

• porogamy

• none of these

For self pollination, flower must be

• unisexual

• bisexual

• monosexual

• asexual

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

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

• Endosperm of wheat

• Endosperm of castor

• Palisade cells in leaf

• Root hairs

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

• cutin

• suberin

• sporopollenin

• callose

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.

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

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.

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.

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.