Question

Pollen grains are able to withstand extremes of temperature and desiccation because their exine is composed of

• A. cutin
  
• B. callose
  
• C. suberin
  
• D. sporopollenin
  

Answer 1

The correct option is D sporopollenin


Composition of pollen exine

Pollen exine is composed of organic sporopollenin which makes it resistant to enzymes, acids, desiccation and high temperature. So, the pollen grains are able to withstand extremes of temperature and desiccation.



Final answer
c. sporopollenin