Professional gardeners often soak seeds in hydrogen peroxide before planting them. Why?

Professional gardeners often soak seeds in hydrogen peroxide before planting them in order to increase the germination percentage or to reduce germination failure. When the seeds are soaked in hydrogen peroxide, the seed coat becomes soft and enzymes present in the seed becomes active. Due to soaking of seeds, the seed takes less time to germinate. So that's why gardeners uses this method.

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you know they are heterozygous for a trait because they have it as jj or jj.