For example, if a plant needs protection against a leaf-feeding pest, the protective agent need not also be present in the grain (that's harvested for food).
A small protuberance on a stem or branch, sometimes enclosed in protective scales and containing an undeveloped shoot, leaf, or flower.
芽，萌芽：茎或枝上小的隆起物，有时被包在保护性的介壳中，内中有未发育的根、叶子或花。
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