For example, for many plants in the Delhi area, environmental conditions may be right for seed germination when the seed fall from the parent plant in the fall, but if the seed germinated then it would have little chance to become an established plant before winter set in. Thus most plants native to this area have some type of dormancy mechanism to prevent fall germination. Plants from warm climates with no strong seasonality usually have no dormancy mechanisms. Most commonly grown vegetables and annual bedding plants have no dormancy mechanisms. They either originated in warm climates and never had the mechanisms or have lost the mechanisms since becoming cultivated plants.
Humans now serve as their dormancy mechanism.
Thick or waxy seed coats that prevent water from being imbibed. This type of mechanism works until the seed coat has worn away enough to allow water to get inside the seed coat. This process is called scarification and is relatively easy for us to do. B. cutting the seed coat with a knife being careful not to damage the rest of the seed. C. burning the seed coat away with a fire or by soaking the seed in an acid.