Advantage of cleistogamy is

• higher genetic variability

• more vigorous offspring

• no dependence on pollinators

• vivipary

Monoecious plant of Chara shows occurrence of

• antheridiophore and archegoniophore on the same plant

• stamen and carpel on the same plant

• upper antheridium and lower oogonium on the same plant

• upper oogonium and lower antheridium on the same plant

173.

Perisperm differs from endosperm in

• being a haploid tissue

• having no reserve food

• being a diploid tissue

• its formation by fusion of secondary nucleus with several sperms

Cross-pollination through insect agent is called

• anthropophily

• malacophily

• entemophily

• ornithophily

Cleistogamous flowers are

• bisexual flowers which remain opened

• bisexual flowers which remain closed

• open female flower

• open male flower

Emasculation ensures cross-pollination in

• staminate flower

• bisexual flower

• neuter flower

• pistillate flower

Malacophily is the pollination by

• insects

• birds

• snails

• mammals

Endosperm nucleus is

• n

• 2n

• 3n

• 4n

Identify the correct pair of statements.

I. White kernal of coconut is a free nuclear endosperm.

II. In dioecious plants, autogamy is prevented but geitonogamy occurs.

III. Cleistogamous flowers are always selfpollinated.

IV. Castor is an endospermic seed.

• II, IV

• II, III

• I, II

• III, IV

In Zostera, the marine angiosperm, the pollen grains are long ribbon-like and without exine. They have same specific gravity as that of water. How is this feature helpful in their pollination?

• The pollen grains become unwettable

• The pollen grains spread over large and they are lighter

• The pollen grains can float below the surface of water

• None of the above