During unfavourable conditions most of the fresh water sponges and few marine sponges from gemmules, they are

Reduction bodies

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External buds

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Internal buds

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Masses of interstitial cells surrounded by spicules

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Solution

The correct option is C Internal buds
Gemmules are internal buds containing archaeocytes, mostly found in freshwater sponges, these are concerned with asexual reproduction.
These are formed by the sponges under unfavourable conditions.
So, the correct option is 'internal buds'

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Gemmules produced by sponges during unfavorable conditions help in:

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