Conditions essential for the germination of seeds, Biology

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To study the conditions essential for the germination of seeds:-

In the diagram below a having seeds on cotton wool with air, warmth, but no water; b has water, warmth, but no air, because a layer of boiled oil has been poured on top of the water; c has moistened cotton wool and air but is kept cool by having the test tube immerse in a freezing mixture. Folded muslin

 

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