Question

What is the regeneration of an organism? With a neat diagram, describe regeneration in Planaria?

Answer 1

Hint: This is a natural process of restoring or replacing damaged cells, tissues, organs and even entire body parts to full function in plants and animals. This exclusive quality is found in the entire animal kingdom for replacing or redeveloping or reconstructing the whole body from a small fragment of body.

Complete answer:
Regeneration is the natural ability of an organism to replace or restore damaged or missing cells, tissues, organs, and even entire body parts to full function in both plants and animals.
-The organism showing regeneration can grow into a complete individual even if its body is divided into any number of pieces.
-Scientists are studying regeneration for its potential uses in medicine to treat a variety of injuries and diseases.
-A remarkable example of tissue regeneration was exhibited by Echinoderms such as the sea star, crayfish, many reptiles, and amphibians.
-Planaria possess a unique ability to regenerate lost body parts. For example, If a Planarian is split lengthwise or crosswise it will regenerate into two separate individuals.
-The cells at the location of the cut proliferate to form a blastema that will differentiate into new tissues and regenerate the missing parts of the piece of the cut Planaria.
-Due to pluripotent stem cells which are having the ability to create all the various types of cells the new tissues can grow. These adult stem cells are called neoblasts.
The neoblasts are the only proliferating cells in the worm, and they differentiate into progeny that replace older cells.

Note:
-The quantity of regeneration was discovered by Trambley in hydra in the year 1740.
-Regeneration is the natural ability of an organism of replacing or restoring damaged or missing cells, tissues, organs, and even entire body parts to full function in both plants and animals.
-The cells at the location of the cut proliferate to form a blastema that will differentiate into new tissues and regenerate the missing parts of the piece of the cut Planaria.