Why does seed dormancy take place?

What are seeds called that show tolerance to moisture and temperature reduction?

Give scientific reasons: Water is essential for germination.

Treatment of seed at low temperature under moist conditions to break its dormancy is called

Which of the following is not a man-made method to overcome seed dormancy?
$(I)$ Seed coat broken by using knives,sandpapers,etc.
$(II)$ Passage of seed through the digestive tract of animals.
$(III)$ Effect of inhibitory substances can be removed by subjecting the seeds to chilling conditions.
$(IV)$ By application of certain chemicals like gibberellic acid and nitrates.

What is the process of breaking seed dormancy at low temperatures in a moist environment called?