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

Ctenophora

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Cnidaria

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Porifera

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Protozoa

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Solution

The correct option is A Ctenophora
In Ctenophora, sexes are not separate. Reproduction takes place only by sexual means.
In Cnidaria, both asexual and sexual reproduction happens. Polyps produce medusae asexually and medusae form the polyps sexually.
Porifera (sponge) reproduces asexually by fragmentation and sexually by formation of gametes.
Protozoans come under protista which reproduce asexually and sexually by cell fusion and zygote formation, respectively.

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