Question

In Hydra, all old cells are replaced in

• A. 15 days
• B. 30 days
• C. 45 days
• D. 60 days

Answer 1

Answer: (C)

45 days

Hydra have one of the most dramatic regeneration and can show high plasticity (easily shaped/molded). When a part of the body is cut, it can immediately The epithelial cells in the Hydra body column continuously proliferate and replace differentiated epithelial cells at the poles of the polyp, with older cells sloughed off at the tentacle and foot. Hydra can require 40-50 days for old cell replacement.

So, the correct answer is '45 days'.