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

Endothecium and tapetum are formed from

• primary sporogenous tissue

• primary parietal layer

• primary parietal layer and sporogenous tissue respectively

• sporogenous tissue and primary parietal layer respectively

289.

Embryo rescue is resorted to

• obtain new generation of plants quickly

• to reduce chance of seedling growth

• ensure growth of interspecific hybrids

• induce somaclonal variations

Apomictic embryos in citrus arise from

• synergids

• maternal sporophytic tissue in ovule

• antipodal cell

• haploid cell