Question

The seed dormancy is controlled by

• A. External environment
• B. Conditions within the seed itself
• C. Under endogenous control
• D. All of the above

Answer 1

The correct option is D All of the above

Factors control dormancy
The factors controlling seed dormancy are as follows:
External environment
Endogenous control
Conditions within the seed

External environment
Extreme and unfavourable environmental conditions induce seed dormancy. Availability of favourable conditions of temperature, moisture and oxygen can help to break seed dormancy.

Endogenous control
Plant growth factors such as cytokinin, auxin and gibberellin promote seed germination by promoting cell division and inhibit seed dormancy. Stress hormone ABA induces seed dormancy.

Conditions within the seed
Internal conditions within the seed such as immature embryo or endosperm induces seed dormancy.

Final answer
(D) All of the above