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pollen grains are able to withstand extremes of temp. and dessication because their exine is composed of cutin suberine sporopollenine callose

pollen grains are able to withstand extremes of temp. and dessication because their exine is composed of
  1. cutin
  2. suberine
  3. sporopollenine
  4. callose

Grade:12th pass

1 Answers

Apoorva Arora IIT Roorkee
askIITians Faculty 181 Points
6 years ago
Sporopolleninis a major component of the tough outer (exine) walls ofplantsporesandpollengrains. It is chemically very stable and is usually well preserved insoilsandsediments. The exine layer is often intricately sculptured in species-specific patterns (see image at right), allowing material recovered from (for example) lake sediments to provide useful information topalynologists about plant and fungal populations in the past. Sporopollenin has found uses in the field ofpaleoclimatologyas well. Sporopollenin is also found in the cell walls of several taxa ofgreen alga, includingPhycopeltis(anulvophycean)and Chlorella.

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