Which halogen element is necessary for the making of thyroxine hormone by the thyroid gland ?

What is essential for the production of thyroxine hormone by the thyroid gland?

Name the substance which is needed continuously by the thyroid gland to make thyroxine hormone.

Question 26
Which statement is not true about thyroxin?

(a) Iron is essential for the synthesis of thyroxin
(b) It regulates carbohydrate, protein and fat metabolism in the body
(c) Thyroid gland requires iodine to synthesise thyroxin
(d) Thyroxin is also called thyroid hormone

Which one term in each of the following includes the other three?

(a) thyroid, ductless gland, thymus, pituitary, ovary

(b) adrenalin, insulin, hormone, thyroxine, estrogen