Question

In hydra, all old cells are replaced in:
A. 15 days
B. 30 days
C. 45 days
D. 60 days

Answer 1

Hint:-Hydra is said to be a sort of minor, freshwater organisms. This plant can be included in those organisms which present in the phylum Cnidaria and class Hydrozoa. They are instinctive to the moderate and humid regions. Because of their regenerative ability, they are interesting subjects to the biologists. However, it is also a fact that they do not seem to die because of any old age, or certainly, they do not age at all.

Complete answer:
- As we know already, the class of hydra is one of the most dramatic regeneration and it can show high plasticity (it can easily shape and it can easily mold). The Hydra plant is considered to be hypothetically immortal.
- When a certain part of the body is cut, the epithelial cells can instantly get regenerated in the Hydra body. the column in the hydra body is continuously proliferated and they can be replaced within the time.
- The old cells of the hydra plant are pushed on the way to the end of the antennae and pedal disc, from where they are shedding outdoor when the formation of new cells takes place.
- The hydra plant can require 40-50 days for making the replacement of the old cell.
- Thus, we can say that in about 45 days, the older body cells are replaced by new cells.
So, the correct answer is ‘45 days’;.

Note:- We know that the hydra plants are typically said not to age. However, these plants normally have a capacity to differentiate the epithelial cells at the poles of the polyp with the help of older cells which slough off at the tentacle. It is said that the interstitial cells give rise to all other cells of the body just below the tentacles.