CBSE Class 10 Science 2017 · Paper 31/3/C · Question 4
Describe briefly how regeneration is carried out in Planaria.
Answer
Specialised cells in each piece multiply and change into tissues in order, so the piece grows into a complete Planaria.
If a Planaria is cut into a number of pieces, each piece can grow into a complete organism; this is regeneration. It is carried out by specialised cells present in the body piece. These cells proliferate and make a large number of cells. From this mass of cells, different cells undergo changes to become the various cell types and tissues. These changes take place in an organised sequence called development, so the missing parts are formed and each piece develops into a complete Planaria.
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