High incidence of goitre is seen in the mount | vedclass

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(D) The correct answer is $(d)$.Goitre is the enlargement of the thyroid gland,which is primarily caused by a deficiency of iodine.Iodine is a trace e

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$(a)$ and $(b)$ both

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(D) The correct answer is $(d)$.Goitre is the enlargement of the thyroid gland,which is primarily caused by a deficiency of iodine.Iodine is a trace element found in the soil and water of coastal regions,but it is often leached out of the soil in mountainous regions due to erosion and snowmelt.Consequently,both the water and the crops grown in these regions are deficient in iodine.Since iodine is essential for the synthesis of thyroid hormones ($T_3$ and $T_4$),its deficiency leads to the compensatory enlargement of the thyroid gland,a condition known as goitre.

High incidence of goitre is seen in the mountainous region because of

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