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The outer covering of a seed is called the seed coat or testa. This protective layer helps to shield the embryo inside from damage and dehydration.
Valence shell
The outer-most shell of an atom is called the valence shell. It is involved in forming chemical bonds with other atoms.
The outer part of the seed leaves is called the seed coat. It protects the embryo inside the seed and helps regulate seed germination by controlling the exchange of gases and water.
the seed coat