Answer: Seed Dormancy
Step-by-step explanation:
In the last stages of seed maturation, the seed dehydrates and the embryo, which is surrounded by a food supply enters dormancy, that it stops growing and its metabolism nearly ceases. The embryo and it's food supply are enclosed by a hard protective seed coat formed from the integument of the ovule.
Dormancy is a condition of extremely low metabolic rate and suspension of growth and development.
Some seeds species as soon as they are in suitable environment. Others remain dormant, even if sown in a favorable place until an environmental cue causes them to break dormancy.