what is meaning of midrib
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Answer:
midrib The central, thick, linear structure that runs along the length of a plant thallus or lamina. It occurs in true leaves as a vein running from the leaf base to the apex and in the leaf-like structures of mosses and seaweeds. It provides support and is a translocative vessel. A Dictionary of Plant Sciences
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Explanation:
the central or middle rib of a leaf.
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