Scarification

Definition

Scarification is the process of weakening, opening, or altering the coat of a seed to encourage germination. It can be achieved through mechanical, thermal, or chemical means.

5 Must Know Facts For Your Next Test

1. Scarification breaks the seed's dormancy by allowing water and gases to penetrate its hard outer shell.
2. Mechanical scarification involves physically damaging the seed coat using tools like sandpaper or knives.
3. Thermal scarification uses temperature changes, such as soaking seeds in hot water, to break down the seed coat.
4. Chemical scarification employs substances like sulfuric acid to erode the seed coat and initiate germination.
5. Scarification is vital for seeds with tough coats that naturally inhibit water absorption and gas exchange.

Review Questions

• What are three methods used in scarification?
• Why is scarification important for certain types of seeds?
• How does mechanical scarification differ from chemical scarification?

Related terms

Dormancy: A period during which a seed's metabolic activities slow down and growth is temporarily halted.

Germination: The process by which a seed develops into a new plant after a period of dormancy.

Seed Coat: The protective outer layer of a seed that helps prevent physical damage and desiccation.