Sexual Reproduction in Flowering Plants · Question 26

Which of the following can be expected if scientists succeed in introducing apomictic gene into hybrid varieties of crops?

1. There will be segregation of the desired characters only in the progeny
2. Polyembryony will be seen and each seed will produce many plantlets
3. Seeds of hybrid plants will show longer dormancy
4. Farmers can keep on using the seeds produced by the hybrids to raise new crop year after year

The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is :

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

A typical angiosperm embryo sac at maturity is :

1. 8-nucleate and 8-celled
2. 8-nucleate and 7-celled
3. 7-nucleate and 8-celled
4. 7-nucleate and 7-celled

In some members of which of the following pairs of families, pollen grains retain their viability for months after release?

1. Rosaceae : Leguminosae
2. Poaceae : Rosaceae
3. Poaceae : Leguminosae
4. Poaceae : Solanaceae

The body of the ovule is fused with the funicle at

1. Chalaza
2. Hilum
3. Micropyle
4. Nucellus

The plant parts which consist of two generations - one within the other

1. (i) and (iv)
2. (i) only
3. (i), (ii) and (iii)
4. (iii) and (iv)

In water hyacinth and water lily, pollination takes place by :

1. Insects and water
2. Water currents only
3. Insects or wind
4. Wind and water

Which one of the following statements regarding post-fertilization development in flowering plants is incorrect?

1. Central cell develops into endosperm
2. Ovules develop into embryo sac
3. Ovary develops into fruit
4. Zygote develops into embryo

Persistent nucellus in the seed is known as

1. Hilum
2. Tegmen
3. Chalaza
4. Perisperm

What is the fate of the male gametes discharged in the synergid?

1. One fuses with the egg, other(s) fuse(s) with synergid nucleus.
2. One fuses with the egg and other fuses with central cell nuclei.
3. One fuses with the egg, other(s) degenerate(s) in the synergid.
4. All fuse with the egg.