Question

Cells present in epidermis but absent in gastrodermis of Hydra are

• A. Musculo-epithelial cells
• B. Nematoblasts
• C. Germ cells
• D. Both B and C

Answer 1

The correct option is A Musculo-epithelial cells

The epitheliomuscular cells have both epithelial and muscular parts in the same cells.

The epitheliomuscular cells of the epidermis are cylindrical with their inner ends produced into two or more processes which have myonemes or un-striped muscle fibres, these fibres branch and branches anastomose. The ectodermal myonemes run parallel to the long axis of the body and tentacles, they form longitudinal muscles which bring about the contraction of the body.

So the correct answer is 'Musculo-epithelial cells'.