Question

The lines seen on leaves ​

Answer 1

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Leaves that do not have a petiole and are directly attached to the plant stem are called sessile leaves. ... Monocots have parallel venation in which the veins run in straight lines across the length of the leaf without converging.

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Answer 2

Your question is incomplete....

but think it should be...

The lines seen on leaves are called?

Then the answer is.... veins