Sexual Reproduction in Flowering Plants · Question 81

What is the function of germ pore?

1. Emergence of radicle
2. Absorption of water for seed germination
3. Initiation of pollen tube
4. Release of male gametes

Which one of the following statements is wrong?

1. When pollen is shed at two-celled stage, double fertilization does not take place.
2. Vegetative cell is larger than generative cell.
3. Pollen grains in some plants remain viable for months.
4. Intine is made up of cellulose and pectin.

Plants with ovaries having only one or a few ovules, are generally pollinated by

1. bees
2. butterflies
3. birds
4. wind

Both, autogamy and geitonogamy are prevented in

1. Papaya
2. cucumber
3. castor
4. maize.

An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is

1. cuticle
2. sporopollenin
3. lignin
4. cellulose.

Even in absence of pollinating agents seed-setting is assured in

1. Commelina
2. Zostera
3. Salvia
4. fig.

In angiosperms, functional megaspore develops into

1. embryo sac
2. ovule
3. endosperm
4. pollen sac.

What is common between vegetative reproduction and apomixis?

1. Both are applicable to only dicot plants
2. Both bypass the flowering phase
3. Both occur round the year
4. Both produce progeny identical to the parent.

Filiform apparatus is a characteristic feature of

1. suspensor
2. egg
3. synergid
4. zygote.

Nucellar polyembryony is reported in species of

1. Citrus
2. Gossypium
3. Triticum
4. Brassica.