List three causes of seed dormancy.

Seeds of some plants germinate immediately after shedding from the plants while in order plants they require a period of rest before germination. The later phenomena is called as dormancy. Give the reasons for seed dormancy and some methods to break it:

Define extinction. List the causes of extinction.

What are advantage of seed dormancy?

What is seed dormancy?

List the steps of fish seed production by induced breeding techniques.

List three phases of gametogenesis.

List three characters of insecta. Give one example.