The leaves are where plants do most of their
photosynthesis. Carbon dioxide and oxygen
enter and leave the leaves through tiny holes on
the underside of the leaves. The holes are called
“stomata” or little mouths. Inside the
cells of the leaf, the plant uses energy from the
sun to put carbon dioxide and water together to
make sugar. Oxygen is a waste product.
A lot of people don’t know this, but the
cell can also take apart the sugar to release
energy. Then they give off carbon dioxide and
water, just like us. If you think about it, they
have to do this because only a part of the plant
does photosynthesis, but all the plant cells need
energy, even the cells in the roots. The sugar
made in the leaves is sent to all the cells in the
plant using the plant’s tube system.
Why do you think the leaf holes (stomata)
close up on hot, dry days?
If questions like these interest you, you may
want to study plant ecology.
Thanks for asking,