Which of the following is an example of regeneration? (a)hydra (b)amoeba (c)spirogyra (d)none of these
Answers
Answer:
a) Hydra
Explanation:
it multiplies through seeds which are fertilised it dies not split
Answer:
(a) Hydra
Explanation:
Regeneration
Regeneration is the process in which if an organism is cut into several pieces, each of its parts regrows to the original state. This process is carried out by specialized cells called stem cells. It takes place in organisms that have a very simple structure with very few specialized cells.
The cells divide quickly into a large number of cells. Each cell undergoes changes to form various cell types and tissues. This sequential process of changes is known as development. The tissues form various body parts and organs.
Explanation for correct option:
(a) Hydra
Hydra had been used as the model of regeneration since time immemorial. Once wounded their cells start to regenerate and grow into pre-existing cells.
- Hydra grows by continuously losing cells from its base and by budding.
- A gradient of inhibitor is produced by the head. This prevents the formation of other heads.
- The concentration of inhibitor is reduced.
- The positional value increases locally.
- A new head is formed without any new growth.
Explanation for incorrect options:
(b) Amoeba
Amoeba reproduces asexually through binary fission. In this process, an individual divides itself into two daughter cells. These are genetically identical to each other.
(c) Spirogyra
Spirogyra species can reproduce both sexually and asexually. Asexual or vegetative reproduction occurs by simple fragmentation of the filaments. Sexual reproduction occurs by a process known as conjugation, in which cells of two filaments lying side by side are joined by outgrowths called conjugation tubes.
(d) None of these
Option (a) Hydra is correct so, above option (none of these) is incorrect.
Therefore, option (a) is correct.
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