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

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Ans.
Reasons for seed dormancy:
The seed coat is hard, and the impermeable layers of the seeds prevent uptake of water, this inhibits growth and delays the process of germination. In some cases, the seeds have undeveloped embryos which is the reason for the delay in germination.
 
Methods to break seed dormancy:
Seed dormancy can be broken by changes in temperature of the environment and other conditions. Physical dormancy can be also broken when the seed goes through the gut of an animal who has consumed it. Mechanical dormancy is broken with the help of some external factors. Example: An animal might break the hard coat of the seed.

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