Plants that can use more light generally
require more energy to live. Thus, plants
living on the forest floor in low light (because
trees above them are providing shade) don't need
as much energy, but they also don't use as much.
Plants that grow in the open sun often can use
more energy, but those plants wouldn't survive if
they were in the shade all of the time.
Additionally, too much light increases
temperature and with it evaporation. Plants
that live in dry climates have adaptations to
reflect away excess light to avoid getting too hot
and losing all of their water.
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