Question

In regeneration, from where does each cut part of an organism get its nutrition to grow into a new individual?

Answer 1

Planaria can be cut into pieces, and each piece can regenerate into a complete organism. Cells at the location of the wound site proliferate to form a mass of cells that will differentiate into new tissues and regenerate the missing parts of the piece of the cut planaria.Very small pieces of the planarian, estimated to be as little as 1/279th of the organism it is cut from, can regenerate back into a complete organism over the course of a few weeks. New tissues can grow that have the ability to create all the various cell types.The organism itself does not have to be completely cut into separate pieces for the regeneration phenomenon to be witnessed. In fact, if the head of a planaria is cut in half down its centre, and each side retained on the organism, it is possible for the planaria to regenerate two heads and continue to live.      

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Gaurav , Student

Member since Jul 03 2012

Sometimes in organisms like Planaria and Hydra, their parts of the body are accidentally cut such as when its body gets entangled under rocks, in order to escape from under the rocks it cuts its body into tiny bits. These peices can grow into a complete organism. This is known as regeneration. Regeneration is carried out by specialised cells. these cells proliferate and make large number of cells. From this mass of cells, different cells undergo changes to become various cell types and tissues. These changes take place in an organised sequence reffered to as development. However, regeneration is not same as reproduction, since most organisms would not normally depend on being cut up to be able to reproduce.

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Arsha , Student

Member since Mar 10 2013

Planaria can be cut into pieces, and each piece can regenerate into a complete organism. Cells at the location of the wound site proliferate to form a mass of cells that will differentiate into new tissues and regenerate the missing parts of the piece of the cut planaria.Very small pieces of the planarian, estimated to be as little as 1/279th of the organism it is cut from, can regenerate back into a complete organism over the course of a few weeks. New tissues can grow that have the ability to create all the various cell types.The organism itself does not have to be completely cut into separate pieces for the regeneration phenomenon to be witnessed. In fact, if the head of a planaria is cut in half down its centre, and each side retained on the organism, it is possible for the planaria to regenerate two heads and continue to live