At a polar research station, blackout blinds exclude all outside light from a volunteer's room. At 22:00, the room's lamps are switched off, leaving the room dark. At 07:00, the lamps are switched on at a bright setting and their light reaches the volunteer's eyes.
Which statement about the volunteer's melatonin release and alertness after 07:00 is correct?
The bright light will switch melatonin release off, so alertness will rise.
The bright light will increase melatonin release, so alertness will rise.
The bright light will switch melatonin release off, so alertness will fall.
The bright light will increase melatonin release, so alertness will fall.
53 exam-style questions on OCR GCSE Psychology 6.1 Key Concepts, covering 6.1.1 Functions, features and benefits of sleep, 6.1.2 Causes of sleep disorders, and 6.1.3 Endogenous pacemakers and exogenous zeitgebers. Each one has a worked solution and a mark scheme showing where the marks go.