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

Which of the following is $NOT$ essential for seed germination?

What is the function of certain chemicals like $GA_3$ (Gibberellic Acid) and nitrates in plants?

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.

Which of the following is responsible for seed dormancy?

Seed dormancy is due to the