题目内容

Plants use different strategies to spread their seeds,such as _____, _, , _.

A. by wind
B. by water
C. by animals
D. by elastic force

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When animals transmit seeds, it is generally necessary to have _or ___structures on the surface of fruits to be carried easily

A. smooth
B. barb-shaped
C. spine-shaped
D. winglike

There are two necessary conditions for elastic force to disperse seeds. That is, the fruits must be and _ when they are ripe.

A. dried
B. succulence
C. crack
D. closed

Coconut can transmit its seed by sea water because it has an ___and _ exocarp.

A. heavy
B. large
C. soft
D. fibrous

What are the structures in the flowers of cereal plants?

A. Calyxes
B. Lodicules
C. Stamens
D. Gynoscium