Question

Hydra will regenerate from the fragments, if it contains

• A. Tentacles only
• B. Epidermis and gastronomic
• C. Tentacles, epidermis and gastronomic
• D. Epidermis, hypodermis and gastronomic

Answer 1

Answer: (B)

Epidermis and gastronomic

Lower animals like sponges and coelenterates have great regeneration power. Regeneration proves lack of differentiation in these primitive animals. Cnidarian animals have two body layers in their body epidermis and gastrodermis layer. Hence Hydra will regenerate from a fragment if the fragment, contains both epidermis and gastrodermis layer.

So, the correct answer is option B.