题目内容
When animals transmit seeds, it is generally necessary to have _______or _________structures on the surface of fruits to be carried easily
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There are two necessary conditions for elastic force to disperse seeds. That is, the fruits must be__________ and ___________ when they are ripe.
Coconut can transmit its seed by sea water because it has an ___________and _________ exocarp.
What are the structures in the flowers of cereal plants?
What are the structures in the florets of cereal plants?
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