Stamen Male Gametophyte

An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is:
1. Cuticle
2. Sporopollenin
3. Lignin
4. Cellulose

In angiosperms, microsporogenesis and megasporogenesis?

1. Occur in anther

2. Form gametes without further divisions

3. Involve meiosis

4. Occur in ovule

Male gametophyte in angiosperms produces?

1. Two sperms and a vegetative cell

2. Single sperm and a vegetative cell

3. Single sperm and two vegetative cells

4. Three sperms

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

1.	Pollen kit	2.	Cellulosic intine
3.	Oil content	4.	Sporopollenin

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

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

1. Poaceae; Solanaceae

2. Rosaceae; Leguminosae

3. Poaceae; Rosaceae

4. Poaceae; Leguminosae