An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is
cuticle
sporopollenin
lignin
cellulose.
How many pollen grains are formed from $10$ microspore mother cells by meiosis
Ubisch bodies are present in
Pollens have two prominent walls which are ... $A$... and ... $B$ .... Here $A$ and $B$ refers to
Which one of the following is resistant to enzyme action?