题目内容

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

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

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

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What are the structures in the flowers of cereal plants?

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

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What are the structures in the florets of cereal plants?

A. Flowers
B. Lodicules
C. Lemma
D. Palea

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What is double fertilization in angiosperms?

A. One sperm binds to the egg cell
B. Another sperm binds to the central cell
C. One sperm binds to the synergid
D. Another sperm binds to the antipodal cell

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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.

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

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?

What is double fertilization in angiosperms?

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.