Question

In gymnosperms, the pollen chamber represents

• A. An opening in the megagametophyte through which the pollen tube approaches the egg
• B. The microsporangium in which pollen grains develop
• C. A cavity in the ovule in which pollen grains are stored after pollination
• D. A cell in the pollen grain in which the sperms are formed.

Answer 1

The correct option is C

A cavity in the ovule in which pollen grains are stored after pollination

The correct option is C

Explanation of the correct option:

1. Following fertilization, pollen grains grow in a cavity called a pollen chamber.
2. The producing cell nucleus separates into two gametic nuclei within the pollen chamber, and the tube cell elongates to produce the pollen tube.
3. The gametic nuclei can pass via the female gametophyte's pollen tube.
4. A zygote is formed when one unites with the female gamete (2n).

Explanation of the incorrect options:

Option A:

1. The megagametophyte (embryo sac) opening is called the chalaza, through which a pollen tube approaches the egg in the embryo sac.

Option B:

1. Microsporangium in flowers is called anther, and pollen grains develop here.
2. Developing pollen grains that are in the microsporangium are nurtured by the inner layer called the tapetum.

Option D:

Generative cell in the pollen grain undergoes division resulting in the formation of two sperm nuclei.

Final answer: In gymnosperms, the pollen chamber represents a cavity in the ovule in which pollen grains are stored after pollination.