A gland that gradually reduces and degenerates with ageing is

thyroid

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thymus

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parathyroid

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pituitary

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Solution

The correct option is B thymus
Thymus gland is located on the dorsal side of the heart and the aorta. It plays a major role in the development of the immune system. It secretes the hormone thymosins.
Thymosins play a major role in production of antibodies and the differentiation of lymphocytes. The size of thymus reduces with age. Therefore there is reduced production of thymosins in older individuals and their immune responses become weak.

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The Thymus

Standard VII Biology

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