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Differentiate between Testa and tegmen

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Differences between Testa and Tegmen are:

TestaTegmen
Testa is the protective outer covering of the seed coat.Tegmen is the protective inner part of the seed coat.
Testa is smooth, thicker and impermeable.Tegmen is thin and membranous.
Testa protects the seed from insect, bacteria as well as mechanical injury.Tegmen protects the embryo from dehydration and mechanical damages.

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