IB Biology SL Theme C: Interaction and interdependence questions

Exam-style multiple choice and written questions with full markschemes. Check multiple choice answers straight away, or type, photograph or draw a written answer and get it marked.

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Question 1

Paper 2Easy5 marks

A healthy adult’s pineal gland secretes melatonin. The table shows relative melatonin secretion over 24 hours. A student walks along a narrow beam while catching a ball.

TimeRelative melatonin secretion / arbitrary units
08:002
14:001
20:005
02:009
08:00 next day2
(a)

Describe the pattern of melatonin secretion shown in the table.

[1]
(b)

Explain how this pattern helps establish a cycle of sleeping and waking.

[2]
(c)

State two roles of the cerebellum in the student’s movements.

[2]

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