DP Biology (last assessment 2024)

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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.

Examiners report

This was relatively well answered, with points related to circadian rhythms and induction of sleep. The commonest error was to confuse melatonin and melanin.

Syllabus sections