Sense organs — Paper 2 · IGCSE Biology (9-1) 0970

25 The diagram shows the structure of human skin. Y X Z What are X, Y and Z? X Y Z A receptor sensory neurone sweat gland B sensory neurone hair erector muscle receptor C sweat gland hair erector muscle sensory neurone D sweat gland receptor blood vessel

1 marks

Answer: C

This question in 0970/21 May/June 2018

26 Which statement about light receptors in the retina of a normal human eye is correct? A The cones only work in dim light. B The rods are found in the fovea. C There are three types of cone. D There are three types of rod.

1 marks

Answer: C

This question in 0970/21 May/June 2019

26 The diagram shows a cross-section of the human eye. Which label points to the spot in the eye where vision is the sharpest? D C B A

1 marks

Answer: C

This question in 0970/22 May/June 2019

23 The diagram shows the muscles that control the size of the pupil in an eye. iris circular muscles radial muscles pupil How do the muscles make the pupil smaller? circular muscles radial muscles A contract contract B contract relax C relax contract D relax relax

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2019

25 Which row shows the actions needed for the eye to focus on a distant object? ciliary suspensory lens becomes muscles ligaments A contract slacken thicker B relax slacken thicker C contract tighten thinner D relax tighten thinner

1 marks

Answer: D

This question in 0970/21 May/June 2020

24 Which responses occur in the iris of the eye when a person walks from a brightly lit area to a dimly lit area? circular muscle radial muscle A contract contract B contract relax C relax contract D relax relax

1 marks

Answer: C

This question in 0970/22 May/June 2020

26 The diagram shows the appearance of an eye when in bright light. bright light Which row gives the correct states of the iris muscles in bright light? radial muscles circular muscles A contracted contracted B contracted relaxed C relaxed contracted D relaxed relaxed

1 marks

Answer: C

This question in 0970/21 May/June 2021

27 Which row shows the pupil reflex in bright light? muscles in iris size of pupil circular radial A contracts relaxes larger B contracts relaxes smaller C relaxes contracts larger D relaxes contracts smaller

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2021

24 Where in the eye is the greatest concentration of cells that allow humans to see colour? A B C D

1 marks

Answer: C

This question in 0970/21 May/June 2022

25 What occurs during accommodation to focus on distant objects? ciliary lens suspensory muscle shape ligaments A contracts fat slack B relaxes thin tight C contracts fat tight D relaxes thin slack

1 marks

Answer: B

This question in 0970/21 May/June 2023

25 During the pupil reflex in bright light, what describes the actions of the muscles in the iris? A The circular muscles of the iris contract and the radial muscles relax. B The circular muscles of the iris contract and the radial muscles contract. C The circular muscles of the iris relax and the radial muscles contract. D The circular muscles of the iris relax and the radial muscles relax.

1 marks

Answer: A

This question in 0970/22 May/June 2023

26 What would be the pupil size and lens shape of a person reading a mobile phone text message in a brightly lit room? pupil size lens shape A large fat B large thin C small fat D small thin

1 marks

Answer: C

This question in 0970/21 May/June 2024

27 Which responses occur in the iris of the eye when a person walks from a brightly lit area to a dimly lit area? circular muscles radial muscles A contract contract B contract relax C relax contract D relax relax

1 marks

Answer: C

This question in 0970/22 Oct/Nov 2024

28 Which statements about hormones are correct? 1 Adrenaline decreases pupil diameter. 2 Adrenaline increases pupil diameter. 3 Insulin decreases blood glucose concentration. 4 Insulin increases blood glucose concentration. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: C

This question in 0970/22 Oct/Nov 2024

22 Which row shows the function of rod cells? night vision colour vision A yes yes B yes no C no yes D no no

1 marks

Answer: B

This question in 0970/21 May/June 2025

24 The diagram shows a vertical section through part of a human eye. A fly is coming nearer to the eye. The eye begins to focus the image of the fly on the retina. Q fly R S How do the labelled parts of the diagram change? Q R S A contracts becomes thinner becomes tighter B relaxes becomes fatter becomes slacker C contracts becomes fatter becomes slacker D relaxes becomes thinner becomes tighter

1 marks

Answer: C

This question in 0970/22 May/June 2025

19 A person looks at a distant object in a dark area. The person then moves to a bright area and looks at a near object. Which statement describes some of the changes that take place in the person’s eyes? A The circular muscles of the iris contract, the pupil constricts, the ciliary muscles relax and the lens gets thicker. B The radial muscles of the iris relax, the circular muscles of the iris contract, the pupil constricts and the lens gets thinner. C The radial muscles of the iris relax, the pupil constricts, the ciliary muscles contract and the lens gets thicker. D The radial muscles of the iris relax, the pupil dilates, the ciliary muscles relax and the lens gets thicker.

1 marks

Answer: C

This question in 0970/22 Oct/Nov 2025