Once a mother plant releases its embryos to the outside world, they have to survive on their own without family protection. To ensure successful colonization by these vulnerable creatures, the mother plant provides the embryo with a backpack full of energy, called the endosperm. Since, over time, the only plants that will survive are those that reproduce and compete successfully, the mother plant's whole life is dedicated to producing sugars in its leaves, which are ultimately stored in these backpacks. The sugars are manufactured in the leaves when the plant turns the Sun's energy into chemical energy and then transported to the seeds. The amount of sugars that fill a seed directly determines the seed's size.
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