Yes, both plants and animals need oxygen for
cellular respiration. No matter which type of
organism is doing cellular respiration, the
inputs are glucose and oxygen and the products are
carbon dioxide and water.
As you know, we can’t do photosynthesis, but
plants can do both photosynthesis and cellular
respiration. In photosynthesis, the inputs are
carbon dioxide and water, with light as the energy
source. The products are glucose and oxygen.
Think about a plant, such as a tree or a flower.
Which parts of the plant are going to be able
to do photosynthesis (hint: light)? All of
the rest of the cells need to get their energy
from the sugar made by the cells that can do
photosynthesis. If a plant loses its leaves in
fall, it has to live off of stored sugar until the
following spring. That means using cellular
How do you think the plant delivers oxygen to
places like its roots?
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