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Leaves
are the food factories of a plant. The raw materials they use are of
the simplest carbon dioxide, water and a few mineral ingredients. The
first, a gas, is all around them in the air and they absorb it through
tiny pores in their surface. Water, and the minerals dissolved in it, is
collected by the roots from the ground in which the plant grows. The
agents within the tissues of the leaves that process these raw materials
are small grains containing the green substance, chlorophyll. Powered
by the energy of the sun, this is able to combine these elements and
produce starches and sugars, the food from which the plant builds its
various tissues. The process is called photosynthesis.