_________ cells help hydra in sudden contraction of its body.
A
Musculo-epithelial
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B
Musculo-glandular
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C
Musculo-nutritive
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D
Interstitial
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Solution
The correct option is A Musculo-epithelial The hydra is able to contract its body due to the presence of musculo-epithelial cells in the outer body layer. The longitudinal muscular process occurs in the body of the hydra that originates from epithelio-muscular cells. Contraction of these cells helps in shortening of the body.