Question

Which of the following methods can be used to break seed dormancy artificially?

• A. Chilling of seeds
• B. Application of thiourea
• C. Exposing to certain wavelengths of light
• D. All the above
  

Answer 1

The correct option is D All the above


Dormancy is the process during which seeds do not germinate even under favourable conditions. It is a result of endogenous control, which means control by conditions within the seed itself. Natural (e.g., the action of soil microbes) or artificial methods can overcome dormancy.

Artificial methods of removing the effect of inhibitory substances include subjecting the seeds to chilling conditions or by applying certain chemicals like thiourea, potassium nitrate, and gibberellic acid.
In nature, seeds often go through cold and moist conditions in winter and then germinate in the spring. This condition can be simulated artificially by keeping the seeds in the refrigerator for several weeks. The seeds will then be ready to germinate. Specific wavelengths of light can also break dormancy and promote seed germination.