Sexual Reproduction in Flowering Plants · Question 24

To ensure that only the desired pollens fall on the stigma in artificial hybridization process Choose the correct answer from the options given below

1. A, D and E only
2. A, B and C only
3. B, C and D only
4. B, C and E only

In general the egg apparatus of embryo sac in angiosperm consists of

1. One egg cell, two synergids, two antipodal cells, two Polar nuclei
2. One egg cell, two synergids, three antipodal cells, two Polar nuclei
3. One egg cell, two synergids, two antipodal cells, three Polar nuclei
4. One egg cell, three synergids, two antipodal cells, two Polar nuclei

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