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CBSE - IX - Biology - Diversity in Living Organisms


Asked by bookie c 26th December 2011, 11:41 AM
Answered by Expert


Physalia exhibit the highest degree of polymorphism. They have three kinds of polyploids :

  1. Gastrozooids for nutrition : Each gastrozooid possesses a long tentacle which may hangdown several metres below the pneumatophore. The gastrozooid feeds on fish. 2. Dactylozooids for defense : Dactylozooids are of various sizes. Each is a tubular mouthless individual with a long tentacle.They form a drift net for capturing fish for food which is drawn upto the gastrozooid by the contraction of tentacles. 3. Gonozooids for the asexual production of medusa: Gonozooids are branching blastostyles having leaf-like gonopores and male and female medusae .The male medusoids are reduced and remain attached but the female medusoids become detached and swim freely.
Answered by Expert 27th December 2011, 12:13 PM

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