Which of the following statements about hormones is not correct?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Insulin hormone regulates blood sugar and is secreted by pituitary gland
Hormones are chemical messengers made by ductless (endocrine) glands and carried by the blood to their target organs. Insulin and glucagon together keep the blood glucose within a narrow range.
Option (1) They are secreted in the blood stream or lymph by ductless glands — A correct statement about hormones. Endocrine glands have no ducts; they pour hormones directly into the blood, which carries them to the site of action.
Option (2) They stimulate the activity of certain organs — A correct statement about hormones. Hormones act as intercellular messengers and change the activity of their target organs.
Option (3) They may be proteins, steroids or amino acid derivatives — A correct statement about hormones. Insulin is a polypeptide, the sex hormones are steroids, and thyroxine and adrenaline are amino acid derivatives.
Option (4) Insulin hormone regulates blood sugar and is secreted by pituitary gland — Not a correct statement about hormones. Insulin does regulate the blood glucose level, but it is secreted by the pancreas (the β-cells of the islets of Langerhans), not by the pituitary gland.
NCERT (2026-27 edition):
Hormones
