Reference Terms
from Wikipedia, the free encyclopedia

Leaf

In botany, a leaf is an above-ground plant organ specialized for photosynthesis.

A leaf is typically flat and thin, to expose the chloroplast containing cells to light over a broad area, and to allow light to penetrate fully into the tissues.

Leaves are also the sites in most plants where respiration, transpiration, and guttation take place.

Note:   The above text is excerpted from the Wikipedia article "Leaf", which has been released under the GNU Free Documentation License.
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July 30, 2015

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