Notifications
Clear all
0
22/09/2020 7:33 pm
Topic starter
Pollen grains are able to withstand extremes of temperature and dessication because their exine is composed of
(a) cutin
(b) suberin
(c) sporopollenin
(d) callose
1 Answer
0
22/09/2020 7:33 pm
(c) sporopollenin
Explanation:
Sporopollenin, which is the hardest substance, helps the pollen grains to withstand extremes of temperatures. It avoids transpiration or water loss. This hard proteinaceous substance present in the exine makes it also spinous in nature.