O-LevelBiologyCoordination & Response5090/21 · Oct/Nov 2022 · Q710 Marks

Humans have receptors to detect stimuli in their environment and a nervous system to coordinate responses to these stimuli.

(a)Complete the table showing different parts of the nervous system, their location in the human body and some of their functions. One row has already been completed. [Table with columns: part of the nervous system, location in the body, function. Rows for medulla, nerve in body, brain (problem solving), brain (regulates body temp), relay neurone, cerebellum][5]
(b)A man is threading a needle. [Figure of an eye threading a needle] To do this, each of the man's eyes produces a focused image of the needle. Explain how different parts of the eye function to produce a focused image of a near object.[5]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2022). The mark or mark type is shown in brackets.

[1] motor neurone ;
[1] cerebrum ;
[1] hypothalamus ;
[1] CNS / brain / spinal cord + transfers nerve impulses from sensory to motor neurones ;
[1] brain;
[1] light is refracted / bent by cornea ;
[1] ciliary muscles / body contract ;
[1] suspensory ligaments become slack ;
[1] lens becomes fatter AW ;
[1] light refracted / bent (more) by lens ;
[1] light / image focused / formed on retina ;
[1] light detected by light receptors in retina / rods / cones ;
[1] nerve impulses triggered ;

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