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How do seeds know when they have reached fertile soil?

Asked by Ltryptophan (12091points) June 8th, 2010

So a farmer drops a seed in a little hole, and covers up the hole with some dirt. Then he drizzles a little water, and the seed starts to grow… Fancy.

What did it? Was it the water that made the seed happy enough to sprout? Was it the weight of the soil? Do seeds feel?

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