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Q.

Discuss the various types of adaptations in freshwater animals.

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Detailed Solution

  • Fresh water animals face the problem of endosmosis. So, to excrete more water from the body, they possess glomerular kidneys.
  • To compensate the salt loss, they have salt-absorbing chloride cells in their gills.
  • Freshwater protozoans undergo encystment in summer.
  • Freshwater sponges produce gemmules.
  • Protopterus (African lung fish) forms a cocoon to undergo aestivation (summer sleep).

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