Coordination and response — Paper 2 · IGCSE Sciences - Co-ordinated (Double) 0654

13 The diagram shows a section through the front of the eye and a front view of the eye. Q P R pupil Which muscles contract when viewing a distant object in dim light? A P and R B P only C Q and R D Q only

1 marks

Answer: D

This question in 0654/22 May/June 2017

7 Which statement about how the eye views near objects (accommodation) is correct? ciliary suspensory lens shape muscles ligaments A contract slacken thick (fat) B contract stretch thin (narrow) C relax slacken thin (narrow) D relax stretch thick (fat)

1 marks

Answer: A

This question in 0654/23 May/June 2017

10 Why might auxins be used in the commercial growth of plants? A to increase uptake of carbon dioxide for increased photosynthesis B to reduce the amount of water needed by the plants C to regulate growth of particular parts of the plants D to stimulate production of chlorophyll for increased yield

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2017

10 In the geotropic and phototropic responses of a plant shoot, does the shoot grow towards or away from the stimulus? geotropism phototropism A away from away from B away from towards C towards away from D towards towards

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2017

7 The graph shows the diameter of the pupil in an eye at different times. X X pupil diameter Y time What is the eye doing at times X and Y? time X time Y A focusing on a distant object focusing on a nearby object B focusing on a nearby object focusing on a distant object C looking at a bright light looking at a dim light D looking at a dim light looking at a bright light

1 marks

Answer: D

This question in 0654/21 Oct/Nov 2018

8 To which environmental stimulus is a plant root responding when it grows downwards? A a decrease in soil water content B light falling on the leaves of the plant C rising temperature D the force of gravity

1 marks

Answer: D

This question in 0654/21 Oct/Nov 2018

8 To which environmental stimulus is a plant root responding when it grows downwards? A a decrease in soil water content B light falling on the leaves of the plant C rising temperature D the force of gravity

1 marks

Answer: D

This question in 0654/22 Oct/Nov 2018

8 To which environmental stimulus is a plant root responding when it grows downwards? A a decrease in soil water content B light falling on the leaves of the plant C rising temperature D the force of gravity

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2018

9 What occurs when our eyes look from a near object in dim light to a distant object in bright light? A Pupils constrict and lenses become thinner. B Pupils constrict and lenses become fatter. C Pupils dilate and lenses become thinner. D Pupils dilate and lenses become fatter.

1 marks

Answer: A

This question in 0654/21 May/June 2019

9 What occurs when our eyes look from a near object in dim light to a distant object in bright light? A Pupils constrict and lenses become thinner. B Pupils constrict and lenses become fatter. C Pupils dilate and lenses become thinner. D Pupils dilate and lenses become fatter.

1 marks

Answer: A

This question in 0654/22 May/June 2019

9 What occurs when our eyes look from a near object in dim light to a distant object in bright light? A Pupils constrict and lenses become thinner. B Pupils constrict and lenses become fatter. C Pupils dilate and lenses become thinner. D Pupils dilate and lenses become fatter.

1 marks

Answer: A

This question in 0654/23 May/June 2019

9 Auxin is a chemical involved in phototropism of plant shoots. When light shines on one side of a plant, the shoot will grow towards it. This is caused by the effect of auxin on cell elongation. Which row is correct? where most auxin effect on is found elongation A bright side inhibits B bright side stimulates C shaded side inhibits D shaded side stimulates

1 marks

Answer: D

This question in 0654/22 Oct/Nov 2019

9 Which actions are voluntary and which are involuntary? a change in pupil size due the lens in the eye changing to a change in light intensity shape during accommodation A involuntary involuntary B involuntary voluntary C voluntary involuntary D voluntary voluntary

1 marks

Answer: A

This question in 0654/23 Oct/Nov 2019

9 Which row is correct when looking at a near object? ciliary suspensory lens muscles ligaments A contracted slack fat B contracted tight thin C relaxed slack thin D relaxed tight fat

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2020

9 Which row correctly compares the hormonal and nervous systems in humans? hormonal nervous speed of length of speed of length of action response action response A fast long fast short B slow long fast long C slow long fast short D slow short slow short

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2020

9 During an experiment, auxin is applied to one side of a shoot just behind the tip. What will this stimulate? A decreased cell elongation in all cells B decreased cell elongation on the side with extra auxin C increased cell elongation in all cells D increased cell elongation on the side with extra auxin

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2020

9 The diagram shows structures in a section through the front of the eye. 1 2 3 When reading a book, how are the labelled structures involved in focusing the eye? 1 2 3 A contracts thicker slackens B contracts thinner tightens C relaxes thicker tightens D relaxes thinner slackens

1 marks

Answer: A

This question in 0654/22 Feb/March 2021

9 A student is in a dangerous situation and adrenaline is released into the blood. The table shows changes to pulse rate, breathing rate and pupil diameter. Which row correctly describes the effect of adrenaline? pulse rate breathing rate pupil diameter A decrease increase decrease B decrease decrease increase C increase increase increase D increase decrease decrease

1 marks

Answer: C

This question in 0654/22 May/June 2021

9 A plant was placed horizontally in complete darkness. The diagram shows how the plant had grown after one week. shoot Which response has the shoot made? A gravitropism away from gravity B gravitropism towards gravity C phototropism away from light D phototropism towards light

1 marks

Answer: A

This question in 0654/23 May/June 2021

9 A person touches a hot object with their hand. They quickly pull their hand away. Which statement is correct? A The effector is their hand. B The effector is the hot object. C The receptor is in the muscles of their arm. D The receptor is in the skin of their hand.

1 marks

Answer: D

This question in 0654/21 Oct/Nov 2021

9 The drug atropine is used to stop the pupil narrowing when a bright light is shone into the eye. Which statement explains how atropine stops the pupil narrowing? A Atropine prevents circular muscles contracting. B Atropine prevents radial muscles contracting. C Atropine causes circular muscles to contract. D Atropine causes radial muscles to relax.

1 marks

Answer: A

This question in 0654/23 Oct/Nov 2021

9 A person who is red-green colour blind cannot distinguish between red and green colours. Which part of the eye is responsible for this? A cornea B iris C lens D retina

1 marks

Answer: D

This question in 0654/22 May/June 2022

9 When a seed germinates in the soil, the root grows downwards. Which type of response is the root exhibiting? A negative gravitropism B negative phototropism C positive gravitropism D positive phototropism

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2022

9 When a person moves from a brightly lit room into a dark room, the pupils in their eyes change in size. Which row correctly describes the change in size and explains what causes this change? pupil size radial muscles circular muscles A decreases contract relax B decreases relax contract C increases contract relax D increases relax contract

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2022

1 The diagram shows how an aquatic carnivorous bladderwort plant reacts to tiny aquatic organisms that swim by. animal is digested aquatic carnivorous by juices produced bladderwort plant contains air animal swims in by the plant plant stalk Which characteristics of living organisms are shown by this plant? A excretion and growth B growth and sensitivity C nutrition and excretion D nutrition and sensitivity

1 marks

Answer: D

This question in 0654/22 Feb/March 2023

9 Which statement explains how the iris responds to an increase in light intensity? A The circular muscles contract and radial muscles relax causing the pupil to decrease in size. B The circular muscles relax and radial muscles contract causing the pupil to decrease in size. C The circular muscles contract and radial muscles relax causing the pupil to increase in size. D The circular muscles relax and radial muscles contract causing the pupil to increase in size.

1 marks

Answer: A

This question in 0654/22 Feb/March 2023

9 What is the function of the cornea? A It carries impulses to the brain. B It controls how much light enters the pupil. C It focuses light onto the retina. D It refracts light.

1 marks

Answer: D

This question in 0654/21 May/June 2023

9 The diagram shows an experiment using the shoots of seedlings. light control shoot shoot five at start days later light lightproof cover shoot five placed over shoot tip days later at start Which statement explains why the covered shoot tip does not grow towards the light? A The lightproof cover decreases auxin production by the shoot tip. B The lightproof cover keeps auxin distribution even on all sides of the shoot. C The lightproof cover prevents auxin from diffusing from the shoot tip. D The lightproof cover stimulates cell elongation without requiring auxin.

1 marks

Answer: B

This question in 0654/22 May/June 2023

9 During an experiment, auxin is applied to one side of a shoot just behind the tip. What will this stimulate? A decreased cell elongation in all cells B decreased cell elongation on the side with extra auxin C increased cell elongation in all cells D increased cell elongation on the side with extra auxin

1 marks

Answer: D

This question in 0654/21 Oct/Nov 2023

1 Which characteristics of living things are demonstrated by phototropism? 1 growth 2 nutrition 3 reproduction 4 sensitivity A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0654/22 Oct/Nov 2023

9 The diagram shows a section through the front of the eye and a front view of the eye. Q P R pupil Which muscles contract when viewing a distant object in dim light? A P and R B P only C Q and R D Q only

1 marks

Answer: D

This question in 0654/22 Oct/Nov 2023

9 The diagram shows a neurone and associated structures. muscle K J Which type of neurone is shown and in which direction do impulses travel? type of direction neurone of impulse A motor J to K B motor K to J C sensory J to K D sensory K to J

1 marks

Answer: A

This question in 0654/22 Feb/March 2024

9 A person looks at a tree in the distance and then starts to read a book. Which changes occur in the eye to enable the person to read their book? suspensory ciliary muscles lens ligaments A contract slacken becomes fatter B contract tighten becomes thinner C relax slacken becomes fatter D relax tighten becomes thinner

1 marks

Answer: A

This question in 0654/21 May/June 2024

9 A person touches a hot object and pulls their hand away. This is a reflex action. What is the pathway for the reflex action? A stimulus  motor neurone  relay neurone  sensory neurone  response B stimulus  relay neurone  motor neurone  sensory neurone  response C stimulus  sensory neurone  relay neurone  motor neurone  response D stimulus  sensory neurone  motor neurone  relay neurone  response

1 marks

Answer: C

This question in 0654/22 May/June 2024

9 A student looks at an object at a distance and then looks at an object close by. This ability to focus on both objects is brought about by changing the shape of the lens. What is this called? A accommodation B coordination C pupil reflex D transmission

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2024

1. Auxinis a chemical that is produced in shoot tips. With which characteristics of living things is auxin involved? growth movement sensitivity 0 OW PD «x Me \ \ x <x \ x

1 marks

Answer: A

This question in 0654/22 Oct/Nov 2024

9 A plant was placed horizontally in complete darkness. The diagram shows how the plant had grown after one week. shoot Which response has the shoot made? A gravitropism away from gravity B gravitropism towards gravity C phototropism away from light D phototropism towards light

1 marks

Answer: A

This question in 0654/22 Oct/Nov 2024

9 What are examples of involuntary actions? 1 widening of the pupil in dim light 2 increasing the pulse rate during exercise 3 contracting muscles to pick up a pencil A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2024

13 During physical activity, the rate and depth of breathing increases. This increase in breathing is caused by the detection of an increase in carbon dioxide concentration. Which row describes this detection? location where organ that increase is detects the detected increase A alveoli brain B alveoli lungs C blood brain D blood lungs

1 marks

Answer: C

This question in 0654/23 May/June 2025

1 When light shines from one direction only, a plant shoot bends towards the light. light Which row gives the characteristics of living organisms shown by the plant shoot? growth movement sensitivity A no yes yes B yes yes no C yes no yes D yes yes yes

1 marks

Answer: D

This question in 0654/21 Oct/Nov 2025

8 The diagram shows a simple reflex arc. spinal cord 1 2 muscle finger 4 pin 3 Which row gives the correct labels for the diagram? 1 2 3 4 A motor neurone sensory neurone receptor relay neurone B motor neurone relay neurone receptor effector C relay neurone motor neurone effector sensory neurone D relay neurone sensory neurone effector motor neurone

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2025