Sexual Reproduction in Flowering Plants · Question 31

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.

Which of the following has proved helpful in preserving pollen as fossils?

1. Pollenkitt
2. Cellulosic intine
3. Oil content
4. Sporopollenin

Winged pollen grains are present in

1. Mustard
2. Cycas
3. Mango
4. Pinus

Double fertilization is

1. fusion of two male gametes of a pollen tube with two different eggs
2. fusion of one male gamete with two polar nuclei
3. fusion of two male gametes with one egg
4. syngamy and triple fusion

Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?

1. Hydrilla
2. Yucca
3. Banana
4. Viola

Pollen grains can be stored for several years in liquid nitrogen having a temperature of

1. -120 C
2. -80 C
3. -196 C
4. -160 C