A) pectocellulose
B) callose
C) cellulose
D) sporopollenin
Correct Answer: B
Solution :
The deposition of callose starts in pollen mother cell as it enters meiosis and is complete by the end of first meiotic division. By the time tetrad are formed, the common callose wall dissolves even then all the four micro-spores lie within a common callose wall.
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