O-LevelBiologyCoordination & Response5090/21 · Oct/Nov 2019 · Q610 Marks
The diagrams show a man fishing. [Figure 6.1]
- (a)In diagram K, his fishing rod bends downwards when he catches a fish. Explain how his nervous system is made aware that the rod is bending.[5]
- (b)Diagram L shows him raising the rod further after catching the fish. Explain how named structures in his right arm have caused the arm to bend in the way shown.[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 2019). The mark or mark type is shown in brackets.
- [1] stimulus;
- [1] receptors / named receptor;
- [1] in skin / eyes / retina;
- [1] impulses;
- [1] sensory / afferent neurone ;
- [1] synapse;
- [1] relay / inter/ intermediate ;
- [1] spinal cord / brain / CNS ;
- [1] biceps;
- [1] contracts;
- [1] triceps;
- [1] relaxes;
- [1] antagonistic;
- [1] pulls on ulna / ulna moves closer to humerus ;
- [1] hinge joint + elbow ;
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