DP Biology (first assessment 2025)

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Question 23M.2.HL.TZ1.2d

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Date May 2023 Marks available [Maximum mark: 2] Reference code 23M.2.HL.TZ1.2d
Level HL Paper 2 Time zone TZ1
Command term Outline Question number d Adapted from N/A
d.
[Maximum mark: 2]
23M.2.HL.TZ1.2d
(d)

Outline the role of melatonin in humans.

[2]

Markscheme
  1. control/maintain/regulate circadian rhythms;
  2. secreted/released late evening/end of day/in dark/night time/dim light/absence of blue light;
  3. helps to induce sleep/sleepiness/influences timing of sleeping/waking/control sleep cycle;

Do not award mpb unless the answer is referring to secretion, not just correlations.

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