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CIE iGCSE Co-Ordinated Science B13.1 Coordination and response Exam Style Questions Paper 1

CIE iGCSE Co-Ordinated Science Paper 1 - All Chapters

Question

The diagram shows three types of neurone.

Which order do impulses pass through the neurones in a reflex action?

A. P → R → Q
B. Q → P → R
C. R → P → Q
D. R → Q → P

▶️ Answer/Explanation
In a reflex action, impulses travel in the following order: sensory neurone → relay neurone → motor neurone. The diagram shows R as the sensory neurone (with the cell body at the side and dendrites connecting to the receptor), P as the relay neurone, and Q as the motor neurone. Therefore, the correct order is R → P → Q.
✅ Answer: (C)

Question

Which structures make up the mammalian nervous system?

A. brain, muscles, impulses
B. brain, nerves, spinal cord
C. effectors, muscles, spinal cord
D. impulses, effectors, nerves

▶️ Answer/Explanation
The nervous system is made up of the central nervous system (brain and spinal cord) and the peripheral nervous system (nerves that connect the CNS to the rest of the body). Muscles are effectors, and impulses are electrical signals – they are not structural components.
✅ Answer: (B)

Question

In which order does an impulse pass along neurones during a reflex action?

A. motor → relay → sensory
B. motor → sensory → relay
C. sensory → motor → relay
D. sensory → relay → motor

▶️ Answer/Explanation
The reflex arc pathway is: receptor → sensory neurone → relay neurone (in spinal cord/CNS) → motor neurone → effector; this pathway allows a fast, automatic response without involving the brain consciously.
The relay (connector) neurone is always in the middle — between the sensory and motor neurones — so the sequence must be sensory → relay → motor.
✅ Answer: (D)

Question

A plant is placed in a box. The box has a hole so that the plant is illuminated from one side. The plant is observed after one week. The result is shown.

What explains the growth of the plant after one week?

A. Plant shoots grow towards light, showing phototropism.
B. Plant shoots grow towards gravity, showing gravitropism.
C. Plant shoots grow towards light, showing gravitropism.
D. Plant shoots grow towards gravity, showing phototropism.

▶️ Answer/Explanation
The plant shoot bends towards the light source because auxin accumulates on the shaded side, causing faster cell elongation there — this directional growth response to light is called phototropism.
Gravitropism refers to growth in response to gravity, not light, so options B, C, and D are incorrect.
✅ Answer: (A)

Question

The graphs show the pupil diameter and heart rate of a person over a period of 30 minutes. The person was given an unexpected shock at one point during the 30 minutes.

At which time did the person experience a shock causing them to release adrenaline?

A. 5 minutes
B. 10 minutes
C. 15 minutes
D. 25 minutes

▶️ Answer/Explanation
Adrenaline release causes an increase in heart rate and pupil dilation (increased pupil diameter) as part of the “fight or flight” response.
The correct time point is the one where both graphs show a sudden simultaneous increase.
This matches the point at 25 minutes on both graphs.
✅ Answer: (D)
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