Externally, the leaf has a petiole through which it attaches to the leaf branch or stem, lamina- the broad ?at surface, margin- the outline and the leaf apex.
The leaf margin can be smooth, dentate, serrated or entire.
The size of a leaf depends on its environment. Plants in arid areas have small sized leaves with some leaves reduced to needle like shape.
This helps reduce the rate of water loss in such plants. However, the plants in areas of water abundance have broad leaves to enable them lose the excess Water.
Anganifelix answered the question on May 8, 2018 at 16:03
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