Other Glands & Mechanism — NEET Biology MCQs with Solutions
Free NEET Biology Other Glands & Mechanism MCQs with step-by-step solutions (6 questions). Part of Chemical Coordination and Integration. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Other Glands & Mechanism · easy · theory
The gland that secretes melatonin and regulates the sleep-wake (diurnal) cycle is the:
A. Thyroid
B. Pineal gland ✓ Correct
C. Thymus
D. Adrenal
Solution: The pineal gland secretes melatonin, which maintains the body's circadian rhythm and sleep-wake cycle.
Q2 — Other Glands & Mechanism · easy · theory
The gland that plays a major role in the development of the immune system (T-lymphocytes) is the:
A. Pituitary
B. Pancreas
C. Pineal
D. Thymus ✓ Correct
Solution: The thymus secretes thymosins that promote differentiation of T-lymphocytes; it degenerates with age.
Q3 — Other Glands & Mechanism · medium · theory
The male sex hormones (androgens like testosterone) are secreted by the ______ of the testis:
A. Sperm
B. Germ cells
C. Sertoli cells
D. Leydig (interstitial) cells ✓ Correct
Solution: Leydig cells produce androgens (testosterone) that develop male secondary sexual characters.
Q4 — Other Glands & Mechanism · medium · theory
The hormones estrogen and progesterone are secreted mainly by the:
A. Ovary ✓ Correct
B. Adrenal medulla
C. Thymus
D. Testis
Solution: The ovary secretes estrogen (follicle) and progesterone (corpus luteum), regulating the female reproductive cycle.
Q5 — Other Glands & Mechanism · hard · theory
Steroid hormones and thyroxine can enter the target cell and act by:
A. Using cyclic AMP as a second messenger
B. Being broken down immediately
C. Binding intracellular receptors and regulating gene (DNA) transcription ✓ Correct
D. Staying outside the cell membrane
Solution: Lipid-soluble hormones (steroids, thyroxine) cross the membrane, bind nuclear/cytoplasmic receptors and alter gene expression.
Q6 — Other Glands & Mechanism · hard · theory
Protein/peptide hormones like insulin act through the second-messenger mechanism because they:
A. Do not need receptors
B. Directly change DNA
C. Cannot enter the cell, so they bind surface receptors and generate second messengers (e.g. cAMP) ✓ Correct
D. Are lipid soluble and enter the nucleus
Solution: Being water-soluble, peptide hormones bind membrane receptors and trigger intracellular second messengers to produce the response.