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NEET2013BotanyAnimal KingdomActual

Which one of the following groups of animals reproduces only by sexual means?

Options

  1. ACnidaria
  2. BPorifera
  3. CProtozoa
  4. DCtenophora

Correct answer

D. Ctenophora

Step-by-step solution

In Ctenophores, asexual reproduction is absent. They are monoccious and fertilization is external. In cnidaria, asexual reproduction by budding is seen in polyp forms, and sexual reproduction in medusae forms. In protozoan, asexual reproduction occurs by fission, budding, etc. and sexual reproduction by conjugation and syngamy. In porifera ascxual reproduction occurs by gemmule formation. Related Theory Ctenophores are free-swimming. marine, solitary, pelagic animals with no polymorphism and no attached stages were

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