Q 1447501483.     Consider the following statements regarding
angiosperms and choose the combination of correct
statements from among them.
I. As a rule, only one pollen tube is formed from one pollen
grain.
II. The protoplast of the pollen grain migrates out and
position itself at the tip of pollen tube.
III. Backward flow of cytoplasm from the tip of the pollen
tube towards the microspore is prevented by the
formation of callose plugs at intervals.


A

I, II and III

B

I and III

C

II and III

D

I and II

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