Question

In gymnosperms, the pollen chamber represents
A)A cell in the pollen grain in which the sperms are formed
B)A cavity in the ovule in which pollen grains are stored after pollination
C)An opening in the megagametophyte through which the pollen tube approaches the egg
D)The microsporangium in which pollen grains develop

Answer 1

Hint: The pollen chamber in gymnosperms is the cavity in the ovule in which pollen grains are deposited after pollination. The generative cell nucleus separates within the pollen chamber to create two gametic nuclei and the cell of the tube elongates to form the pollen tube.

Complete answer:
The pollen chamber in gymnosperms is a cavity in the ovule in which pollen grains are deposited after pollination. The generative cell nucleus separates within the pollen chamber to create two gametic nuclei and the cell of the tube elongates to form the pollen tube. The pollen tube penetrates the gametophyte of the female and the gametic nuclei pass into the tube (also known as sperm nuclei). One of them unites with the female gamete (oosphere) and forms the zygote (2n).

As a result of sexual reproduction, both gymnosperms (cone-bearing plants) and angiosperms (flowering plants) emit pollen. Pollen is produced in microsporangiate cones in gymnosperms (male cones or pollen cones), while pollen is produced in anthers in angiosperms (part of the stamen within the flower). Within the gymnosperm ovules, megaspores formed in cones grow into female gametophytes, while pollen grains develop from cones that contain microspores. Conifer sperm do not have flagella, but rather travel while in contact with the ovule into a pollen tunnel.

Hence, the correct answer is option (B)

Note: The pollen grain germinates to create a pollen tube until the pollen grain is identified and hydrated. As several pollen grains will compete to enter the egg, there is competition in this process. In the case of certain ovules, stigma plays a part in attracting the sperm to a receptive ovule.