CIE iGCSE Co-Ordinated Science B13.1 Coordination and response Exam Style Questions Paper 3
Question
Fig. 4.1 shows the pathway and the structures involved in a reflex action when you touch a hot object.
When a very hot object is touched you immediately remove your hand.
(a) (i) Identify the part labelled Y in Fig. 4.1.
Y …………………………………………………..
(ii) Identify the direction of impulses in parts X and Z by drawing two arrows on Fig. 4.1.
(iii) State the names of the stimulus and effector in this reflex action.
stimulus ……………………………
effector ……………………………..
(iv) State two characteristics of living things that are involved in this reflex action.
(b) The spinal cord is part of the central nervous system.
(i) State the name of the other part of the central nervous system.
(ii) State the name of the other nervous system in humans.
▶Answer/Explanation
Ans:
4(a)(i) relay neurone ;
4(a)(ii) arrow drawn towards the spinal cord at X and one towards the muscle at Z ;
4(a)(iii) stimulus – (change in) temperature ;
effector – muscle / named arm muscle ;
4(a)(iv) sensitivity ;
movement ;
4(b)(i) brain ;
4(b)(ii) peripheral (nervous system) ;