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**Gemmule formation** is an asexual reproductive method seen exclusively in:

AHydra
BSponges (e.g. Spongilla)
CPlanaria
DAmoeba
Answer & Solution
Correct answer: B. Sponges (e.g. Spongilla)
Gemmules are internal buds of dormant archaeocytes coated by amoebocytes — they form **only in sponges** and survive unfavourable conditions. Hydra buds externally Planaria fragments; Amoeba undergoes binary fission.
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