The most resistant organic material known which makes up the outermost layer of pollen wall is
Pectin
Cellulose
Sporopollenin
Lignin
Sporopollenin $\rightarrow$ Caratenoid derivative
In $40\;\%$ angiosperms, the pollen grains are shed at
Identify $'a'$ in given figure :
Which of the following is a useful method to store the pollen grain
In a flowering plant the largest number of haploid cells occur in
The two-celled stage of mature pollen grain consists of
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