Micropyle

Definition

The micropyle is a small opening in the ovule of seed plants through which the pollen tube usually enters during fertilization. It allows the sperm cells to reach the egg cell for successful fertilization.

5 Must Know Facts For Your Next Test

1. The micropyle remains as a small pore on the seed coat after fertilization and seed development.
2. It plays a crucial role in guiding the pollen tube towards the egg cell inside the ovule.
3. In angiosperms, it is located at one end of the ovule, opposite to where it is attached to the ovary.
4. During germination, water often enters through the micropyle to initiate seed swelling and growth.
5. The presence of a micropyle can be used to distinguish between different types of seeds during botanical studies.

Review Questions

Related terms

Ovule:

The structure within ovaries of seed plants that develops into a seed after fertilization.

Pollen Tube: A tubular structure produced by pollen grains which transports sperm cells from pollen to ovules.

Seed Coat: The protective outer covering of a seed formed from integuments of an ovule.