Q. Hormones are secreted by :

Correct Answer: d) Endocrine glands

Explanation:
– Hormones are chemical messengers released directly into the bloodstream.
– Endocrine glands (like pituitary, thyroid, adrenals, pancreas [islets], and gonads) secrete hormones without ducts.
– Exocrine glands use ducts to release substances like enzymes, sweat, or saliva (not hormones).
– Sebaceous glands secrete sebum (oil) into hair follicles/skin.
– While reproductive glands (gonads) do produce hormones, they are considered part of the endocrine system; the general term for hormone-secreting glands is “endocrine glands.”