Sexual Reproduction in Flowering Plants

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

When a diploid female plant is crossed with a tetraploid male, the ploidy of endosperm cells in the resulting seed is

1. tetraploidy
2. pentaploidy
3. diploidy
4. triploidy

An ovule which becomes curved so that the nucellus and embryo sac lie at right angles to the funicle is

1. hemitropous
2. campylotropous
3. anatropous
4. orthotropous.