Sexual Reproduction in Flowering Plants

Apomictic embryos in Citrus arise from

1. synergids
2. maternal sporophytic tissue in ovule
3. antipodal cells
4. diploid egg

Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called

1. xenogamy
2. geitonogamy
3. karyogamy
4. autogamy

Wind pollinated flowers are

1. small, brightly coloured, producing large number of pollen grains
2. small, producing large number of dry pollen grains
3. large producing abundant nectar and pollen
4. small, producing nectar and dry pollen

Which one of the following pairs of plant structures has haploid number of chromosomes?

1. Nucellus and antipodal cells
2. Egg nucleus and secondary nucleus
3. Megaspore mother cell and antipodal cells
4. Egg cell and antipodal cells

What does the filiform apparatus do at the entrance into ovule?

1. It brings about opening of the pollen tube.
2. It guides pollen tube from a synergid to egg.
3. It helps in the entry of pollen tube into a synergid.
4. It prevents entry of more than one pollen tube into the embryo sac.

Unisexuality of flowers prevents

1. geitonogamy, but not xenogamy
2. autogamy and geitonogamy
3. autogamy, but not geitonogamy
4. both geitonogamy and xenogamy

Which one of the following is resistant to enzyme action?

1. Pollen exine
2. Leaf cuticle
3. Cork
4. Wood fibre

Male gametes in angiosperms are formed by the division of

1. generative cell
2. vegetative cell
3. microspore mother cell
4. microspore

Which one of the following is surrounded by a callose wall?

1. Male gamete
2. Egg
3. Pollen grain
4. Microspore mother cell

Long filamentous threads protruding at the end of a young cob of maize are

1. hairs
2. anthers
3. styles
4. ovaries