In animals, chalones are substances responsible for

Regeneration

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Ageing

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Parthenogenesis

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Development

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Solution

The correct option is A Ageing
Regeneration is the production of the damaged parts.
Development is the constructive change in an organism which helps in growth and maturity.
Parthenogenesis is the reproduction of unfertilized ovum.
Chalone is a water-soluble polypeptide inhibitor that is produced by body tissues. It plays an active role in inhibition of mitosis in the cells of that tissue. It has been suggested that these substances play a part in the ageing process.
So, the correct answer is option B.

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