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which.please tell what to explain.
68.
Regeneration is the process carried out by specialised cells which proliferate and make large number of cells and then tissues.In regeneration the organism needs to be cut into pieces to get more organism (the process of getting multiple organism by cutting into pieces).
Regeneration in hydra
=> when body of hydra is cut into number of pieces each specialised cell make large number of cells and tissues. This changes takes place in organised sequence as per the bodies development and finally leads to the development of new organism.
69.
=>The reasons for variation in the different organisms are:
1.In sexual reproduction the individuals is formed by the characteristics of both the parents which gives the individual variation in the body.
2. Different characteristics help an individual to survive in different environment and then this different variation is passed on to different progeny over successive generation.
This way it leads to appearance of different variation in an Individual.
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