Question

Assertion (A): Due to the deficiency of thyroxine hormone, the thyroid gland in the neck enlarges, causing the neck to swell too much. This condition is called goitre.

Reason (R): Iodised salt can provide all the iodine needed by thyroid gland to make sufficient thyroxine hormone for our body so that goitre does not develop.

Options

• Both A and R are true and R is correct explanation of the assertion.

• Both A and R are true but R is not the correct explanation of the assertion.

• A is true but R is false.

• A is false but R is true.

Answer 1

Both A and R are true and R is correct explanation of the assertion.

Explanation:

Due to the deficiency of thyroxine hormone, usually caused by a lack of iodine, the thyroid gland enlarges, causing swelling of the neck. This condition is called goitre. Therefore, Assertion (A) is true.

Iodised salt provides the iodine required by the thyroid gland to produce sufficient thyroxine hormone, thereby preventing goitre. Therefore, Reason (R) is true.

Reason (R) correctly explains Assertion (A) because iodine deficiency leads to reduced thyroxine production, resulting in enlargement of the thyroid gland.

Hence, both A and R are true, and R is the correct explanation of the Assertion.