Integument

Definition

The integument is the outer protective layer of an ovule in seed plants. It eventually develops into the seed coat after fertilization.

5 Must Know Facts For Your Next Test

1. The integument surrounds and protects the nucellus and the female gametophyte within the ovule.
2. In gymnosperms, typically only one integument surrounds the ovule, while angiosperms often have two.
3. After fertilization, the integument hardens to form a protective seed coat which encases the developing embryo.
4. The micropyle is an opening in the integument that allows for pollen entry during fertilization.
5. Integuments are crucial for preventing desiccation and other environmental damage to the developing seed.

Review Questions

• What role does the integument play in seed development?
• How many integuments typically surround a gymnosperm ovule?
• What structure forms from the integument after fertilization?

Related terms

Ovule: A structure in seed plants that develops into a seed after fertilization.

Micropyle: A small opening in the integument of an ovule through which pollen can enter.

Seed Coat: The outer protective covering of a seed derived from the integument.