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B
Musculonutritive cells
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C
Sensory cells
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D
Cnidoblast cells
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Solution
The correct option is A Musculonutritive cells The gastrodermis being the gut of Hydra is made of muscular epithelial cells that also have nutritive cells attached. The nutritive-muscular cells help in the movement of water into the cavity, through the mouth with the help of cilia present on the surface of these cells.
So, the correct answer is 'Musculonutritive cells'.