In photosynthesis, the energy from the sun is used
to turn carbon dioxide (CO2) and water
into sugar. Oxygen is a waste product. Plants
then put the sugars together to make other
molecules. One is starch. This is a way for
plants to store energy for later. Potatoes and
grains are full of starch. Another is cellulose,
which makes plants tough. Another is wood.
The wood that becomes lumber was made through
photosynthesis and other processes. Those other
processes use energy that was captured in
photosynthesis. The tree breaks down some of the
sugar to provide energy to do the work of putting
the smaller molecules together to make the wood.
So most of what you see as lumber used to be
the gas carbon dioxide.
Why is photosynthesis so important to us
Thanks for asking,