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) ;
Question
(a) Table 9.1 shows the highest and lowest frequencies that five animals can hear.
(i) State which animals from Table 9.1 can hear sounds with a pitch higher than a rat can hear.
Explain your answer.
……………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………….
(ii) A bat emits a high frequency sound.
State the range of frequencies emitted by a bat that a healthy human ear can hear.
highest frequency …………………………………………………Hz
lowest frequency …………………………………………………Hz
(b) (i) A bat flies at a constant speed of 40m/ s.
Calculate the time taken by the bat to travel 200m.
time = ……………………………………. s
(ii) Bats and birds often fly into wind turbines and are killed.
State one other disadvantage of using wind turbines to generate electrical energy.
…………………………………………………………………………………………………………………..
……………………………………………………………………………………………………………………
(iii) Wind energy is an example of a renewable energy source.
State one other renewable energy source.
…………………………………………………………………………………………………………………….
(c) (i) Some bats are able to detect ultraviolet radiation. Ultraviolet radiation is part of the electromagnetic spectrum.
Fig. 9.1 shows an incomplete electromagnetic spectrum.
Write ultraviolet in the correct position in the electromagnetic spectrum.
(ii) State one danger of ultraviolet radiation to humans.
…………………………………………………………………………………………………………………….
▶️Answer/Explanation
Ans: 9(a)(i) bat and dolphin ;
pitch is frequency ;
9(a)(ii) highest 20 000 Hz ;
lowest 2000 Hz ;
9(b)(i) time = distance/speed (in any form) or 200 ÷ 40 ;
= 5 (s) ;
9(b)(ii) unreliable / depends on the wind blowing ;
9(b)(iii) HEP /solar / tides / waves / geothermal ;
9(c)(i) ultraviolet in box between X-rays and visible light ;
9(c)(ii) skin cancer / sunburn ;
Question
(a) A person touches a hot pan and instantly removes their hand.
This is a reflex action.
The reflex arc is shown in Fig. 10.1.
(i) State the names of the stimulus and the effector in this reflex arc.
stimulus …………………………………………………………………………
effector …………………………………………………………………………
(ii) State the name of the neurone labelled X in Fig. 10.1.
(iii) The spinal cord is one part of the central nervous system.
State the name of the other part of the central nervous system.
(b) Neurones are the longest cells in the body.
One neurone measures 1.5 m in length.
One plant cell measures 0.1 mm in length.
Calculate how many times longer the neurone is than the plant cell.
(c) Hormones and nerve impulses both carry information around the body.
Identify if each statement is about hormones or nerve impulses.
They are carried in the blood. …………………………………………………………………………………….
They are produced by glands. …………………………………………………………………………………….
They are electrical signals. ………………………………………………………………………………………….
(d) Adrenaline is a hormone released in ‘fight or flight’ situations.
Describe two effects of adrenaline on the body.
1 …………………………………………………………………………
2 …………………………………………………………………………
▶️Answer/Explanation
Ans : 10(a)(i) stimulus – (change in) temperature ;
effector – muscle (in arm) ;
10(a)(ii) X – motor neurone ;
10(a)(iii) brain ;
10(b) evidence of conversion ;
(1500 / 0.1 or 1.5 / 0.0001) = 15000 / 1.5 × 104 ;
10(c) hormone
hormone
nerve impulse ;;
10(d) any two from:
increased depth of breathing / breathing rate ;
increased pulse rate / heart rate ;
widened pupils ;
AVP ;;
Question
(a) Complete the definition of the term hormone.
A hormone is a chemical substance, produced by a ………………………………………..and carried by
the blood. It alters the activity of one or more specific target …………………………………. .
(b) State the name of the component of blood that transports hormones.
……………………………………………………………………………………………………………………………
(c) A person experiences a scary event whilst wearing a heart rate monitor.
Fig. 4.1 shows her heart rate before, during and after the event.
(i) Use Fig. 4.1 to suggest the time that the scary event takes place.
time = …………………………………….. minutes
(ii) Use Fig. 4.1 to identify the maximum heart rate of this person.
heart rate = ………………………………………….. bpm
(iii) State the name of the hormone that causes the increase in heart rate seen in Fig. 4.1.
…………………………………………………………………………………………………………………….
(iv) State two other effects of this hormone.
1 ……………………………………………………………………………………………………………………….
2 ……………………………………………………………………………………………………………………….
(d) Complete these sentences about the human nervous system.
The nervous system consists of the central nervous system and the ……………………………………….. nervous system.
The central nervous system has two parts: the ………………………………………..
and the ……………………………………….. .
▶️Answer/Explanation
Ans: 4(a) gland ;
organs ;
4(b) plasma ;
4(c)(i) 4 (minutes) ;
4(c)(ii) 109 (bpm) ;
4(c)(iii) adrenaline ;
4(c)(iv) widened pupils ;
increased breathing rate ;
any valid point ;;
4(d) peripheral ;
brain ;
spinal cord ;