Respiration in PlantsMedium
Question
Pollen grains are able to withstand extremes of temperature and dessication bacause thier exine is compossed of
Options
A.cutin
B.suberin
C.sporopollenin
D.callose
Solution
Sporopollenin, which is the hardest substance, helps the pollen grains to withstand extremes of temperathures. It avoids transpiration or water loss. this hard proteinaceous substance present in the exine make it also spinous in nature.
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