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STD 11 - 19. Chemical coordination and integration — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 19. Chemical coordination and integration1 Mark
MCQ
$P$ is a small, round, reddish structure located on the dorsal side of forebrain. It contains a stalk and releases a hormone $Q$ which controls diurnal rhythm of the body. $P$ and $Q$ are
  • A
    Hypothalamus, $MSH$ respectively
  • B
    Pineal gland, melanin respectively
  • ✓
    Pineal gland, melatonin respectively
  • D
    Pituitary gland, $MSH$ respectively
✓

Answer

Correct option: C.
Pineal gland, melatonin respectively
c
Pineal gland is a small, round reddish structure located on the dorsal side of forebrain. It releases the hormone called melatonin which controls the diurnal rhythm of the body.
Light reduces melatonin formation and hence maintains the normal rhythm of sleep-wake cycle.

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