In $Nigella$,what is the effect of light on seed germination?

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.

The viability of a seed is determined with the help of.......

Legume seeds exhibit dormancy because of

Based on the following statements,choose the correct option given below.
Statement $I$: Dormancy is a state of metabolic arrest that facilitates the survival of seeds during unfavourable conditions.
Statement $II$: Mature and viable seeds do not germinate even in the presence of favourable conditions unless the dormancy period is completed.

Which process makes the seed coat permeable to water?