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NEET Biology: Human endocrine system-Pineal Practice Questions

14 free multiple-choice questions on Human endocrine system-Pineal (Chemical Coordination and Regulation) for NEET Biology, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.

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  1. Q1. Which thyroid hormone is generally involved in controlling the basal metabolic rate of the body?

    • ACalcitonin
    • BThyroxine (T4)
    • CParathyroid hormone
    • DMelatonin
    Show answer & explanation

    Correct answer: B — Thyroxine (T4)

    Thyroxine (T4) secreted by the thyroid gland is a major regulator of the body's overall metabolic rate.

  2. Q2. The timing mechanism that governs the secretion patterns involving the pineal gland is often referred to as the:

    • AInternal circadian clock
    • BHormonal feedback loop
    • CSomatic response
    • DPeripheral regulation
    Show answer & explanation

    Correct answer: A — Internal circadian clock

    The mechanism that dictates the cyclical timing of physiological processes, including those regulated by the pineal gland, is known as the internal circadian clock.

  3. Q3. The pineal gland is an endocrine gland primarily located in which region of the brain?

    • ACerebellum
    • BHypothalamus
    • CThalamus
    • DMedulla Oblongata
    Show answer & explanation

    Correct answer: B — Hypothalamus

    The pineal gland is situated within the epithalamus, which is a part of the diencephalon, specifically located in the region of the hypothalamus.

  4. Q4. Melatonin, secreted by the pineal gland, plays a key role in regulating which physiological process?

    • AProtein synthesis
    • BBlood clotting
    • CBlood pressure control
    • DSleep-wake cycles
    Show answer & explanation

    Correct answer: D — Sleep-wake cycles

    Melatonin is the hormone primarily responsible for regulating the sleep-wake cycles (circadian rhythm) in humans.

  5. Q5. Which of the following statements is correct regarding the pineal gland's role in the endocrine system?

    • AIt is an endocrine gland that secretes melatonin.
    • BIt is a exocrine gland that secretes hormones into the blood.
    • CIt is a parathyroid gland that controls calcium levels.
    • DIt is purely an exocrine gland that controls metabolism.
    Show answer & explanation

    Correct answer: A — It is an endocrine gland that secretes melatonin.

    The pineal gland is classified as an endocrine gland because it secretes hormones (melatonin) directly into the bloodstream to regulate body functions.

  6. Q6. If the pineal gland is exposed to bright light, what is the typical effect on melatonin secretion?

    • AMelatonin secretion stops
    • BMelatonin secretion decreases
    • CMelatonin secretion remains unchanged
    • DMelatonin secretion increases
    Show answer & explanation

    Correct answer: B — Melatonin secretion decreases

    Exposure to bright light suppresses the production of melatonin, helping to initiate wakefulness during the day.

  7. Q7. The pineal gland primarily functions as a sensor for which type of environmental cue to modulate its activity?

    • ATemperature fluctuation
    • BMechanical pressure
    • CBlood glucose levels
    • DLight exposure
    Show answer & explanation

    Correct answer: D — Light exposure

    The pineal gland's activity is primarily regulated by external light/dark cycles, which act as the primary environmental signal for circadian timing.

  8. Q8. The pineal gland is connected to the Hypothalamus through which major pituitary hormone pathway?

    • AProlactin pathway
    • BTSH pathway
    • CGH pathway
    • DACTH pathway
    Show answer & explanation

    Correct answer: B — TSH pathway

    The pineal gland is regulated by the suprachiasmatic nucleus (SCN) in the hypothalamus, which controls the release of hormones via the pituitary axis (involving TSH).

  9. Q9. The pineal gland is located in which part of the brain?

    • AHypothalamus
    • BCerebellum
    • CCerebrum
    • DMedulla oblongata
    Show answer & explanation

    Correct answer: C — Cerebrum

    The pineal gland is situated deep within the epithalamus region of the brain, often associated with the hypothalamus, governing circadian rhythms.

  10. Q10. Which hormone is primarily secreted by the pineal gland during the night?

    • AThyroxine
    • BAdrenalin
    • CMelatonin
    • DInsulin
    Show answer & explanation

    Correct answer: C — Melatonin

    Melatonin is the hormone secreted by the pineal gland, and its secretion increases during the dark phase to regulate sleep-wake cycles.

  11. Q11. What is the main function of melatonin in the human body?

    • ARegulating the sleep-wake cycle
    • BControlling glandular secretion
    • CRegulating blood pressure
    • DStimulating metabolism
    Show answer & explanation

    Correct answer: A — Regulating the sleep-wake cycle

    Melatonin plays a crucial role in regulating the sleep-wake cycle (circadian rhythm) by signaling the body when it is time to sleep.

  12. Q12. The primary function of the pineal gland is to regulate which physiological process?

    • ACircadian rhythm and sleep-wake cycle
    • BGrowth hormone secretion
    • CMetabolism rate
    • DBlood pressure regulation
    Show answer & explanation

    Correct answer: A — Circadian rhythm and sleep-wake cycle

    The pineal gland secretes melatonin, which plays a crucial role in regulating the body's internal clock (circadian rhythm) and sleep-wake cycles.

  13. Q13. The regulation of the pineal gland's activity is primarily controlled by which external environmental factor?

    • ATemperature
    • BPhotoperiod (day length)
    • CBlood Glucose level
    • DCircadian rhythm of peripheral tissues
    Show answer & explanation

    Correct answer: B — Photoperiod (day length)

    The activity of the pineal gland, and consequently melatonin secretion, is heavily regulated by the external environmental cue of photoperiod (the duration of day and night).

  14. Q14. Which major endocrine gland is situated in the epithalamus region of the brain and is crucial for regulating circadian rhythms?

    • AAdrenal gland
    • BPineal gland
    • CPituitary gland
    • DThyroid gland
    Show answer & explanation

    Correct answer: B — Pineal gland

    The Pineal gland is located in the epithalamus and is centrally involved in regulating the body's circadian rhythms through hormonal secretion.

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