Sexual Reproduction in Flowering Plants

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

In a cereal grain the single cotyledon of embryo is represented by

1. coleoptile
2. coleorhiza
3. scutellum
4. prophyll.

The arrangement of the nuclei in a normal embryo sac in the dicot plants is

1. 3 + 3 + 2
2. 2 + 4 + 2
3. 3 + 2 + 3
4. 2 + 3 + 3

In a type of apomixis known as adventive embryony, embryos develop directly from the

1. nucellus or integuments
2. zygote
3. synergids or antipodals in an embryo sac
4. accessory embryo sacs in the ovule.

Which one of the following represents an ovule, where the embryo sac becomes horse-shoe shaped and the funiculus and micropyle are close to each other?

1. Amphitropous
2. Circinotropous
3. Atropous
4. Anatropous

Through which cell of the embryo sac, does the pollen tube enter the embryo sac?

1. Egg cell
2. Persistent synergid
3. Degenerated synergids
4. Central cell