Question

The body of Hydra contracts with the help of

• A. Epithelio-muscular cells
• B. Endothelio-muscular cells
• C. Sensory cells
• D. Glandulo-muscular cells

Answer 1

The correct option is A Epithelio-muscular cells

The contraction or expansion in Hydra takes place with the help of contractile muscle fibres of both the epidermis and the gastrodermis. These layers are lined by epithelium/ epithelial cells. The two cells involved here are thus the epithelial and muscular cells.

So, the correct answer is 'Epithelo-muscular cells'.