Hydra will regenerate from a fragment, if it contains

Tentacles

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Epidermis and gastrodermis

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Tentacles, epidermis and gastrodermis

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Epidermis, hypodermis and gastrodermis

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Solution

The correct option is D Epidermis and gastrodermis
The high proportion of stem cells in the hydra supports its efficient regenerative ability. Stem cells in hydra are present in the ectodermal-epidermis and gastrodermis.
So, the correct answer is 'Epidermis and gastrodermis'.

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