单词	testa
释义	testa /ˈtɛstə / noun (plural testae /ˈtɛstiː/) Botany The protective outer covering of a seed; the seed coat.The outer testae were removed and seeds placed in the light on filter paper soaked with sterile distilled water.... Sufficient moisture must be present to penetrate the testa or seed coat, but not so much that the seed rots or that the oxygen level in the soil is reduced. Wheat grains consist of the seed coat, or testa, which surrounds the endosperm and embryo. Origin Late 18th century: from Latin, literally 'tile, shell'.
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