Which of the following is responsible for seed dormancy?

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 seed dormancy? State the methods to overcome it.

To remove seed dormancy, we can treat seed by using this chemical.

What causes a delay in the germination of seeds?

The period of suspended growth due to exogenous conditions is termed as