Consider the following statements regarding angiosperms and choose combination of correct statement among these.
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 tio of the pollen tube towards the microspore is prevented by the formation of callose plugs at intervals.
Codes

Options

A. I,II and III
B. I and III
C. II and III
D. I and II

Answer

B

Explanation

NA