Sexual Reproduction in Flowering Plants

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.

Which one of the following pollinations is autogamous?

1. Geitonogamy
2. Xenogamy
3. Chasmogamy
4. Cleistogamy

Wind pollination is common in

1. legumes
2. lilies
3. grasses
4. orchids.

What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells?

1. 42
2. 63
3. 84
4. 21

Apomictic embryos in Citrus arise from

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