Wheat sprouts: Resource mobilization
Seeds hold nutrients for the developing embryo. When seeds are wet and the conditions are optimal (right temperature and light availability) the embryo slowly breaks dormancy. Once the "decision" to break dormancy has been made, a cascade of transformative events occurs, changing the seed into a plant.
First, the embryo sends a hormonal message out into the seed that forces enzymes to be released. The enzymes break down starch and other nutrients in the seed that diffuse into the developing embryo. Tiny roots emerge first and then the seedling breaks out of the seed. Here we see the first growth coming out wheat seeds. Imagine the shoots drawing nutrients from the seed. After they are out for a few days they will turn darker green as they manufacture chlorophyll. Once chlorophyll is made, photosynthesis can take place.
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