Sense organs
Cambridge IGCSE Biology (0610) · Unit 14: Coordination and response · 12 flashcards
Sense organs is topic 14.2 in the Cambridge IGCSE Biology (0610) syllabus , positioned in Unit 14 — Coordination and response , alongside Coordination and response, Hormones and Homeostasis. In one line: Sense organs are groups of receptor cells that respond to specific stimuli such as light, sound, touch, temperature, and chemicals.
This topic is examined in Paper 1 (multiple-choice) and Papers 3/4 (theory), plus Paper 5 or Paper 6 (practical / alternative to practical). Past papers from 2022 to 2025 show this topic across 7 questions worth 87 marks (around 1.3% of all Biology marks in those years).
The deck below contains 12 flashcards — 1 definition, 7 key concepts, 3 process cards and 1 identification card — covering the precise wording mark schemes reward. Use the definition card to lock down command-word answers (define, state), then move on to the concept and application cards to handle explain, describe and compare questions.
The general function of sense organs
Sense organs are groups of receptor cells that respond to specific stimuli such as light, sound, touch, temperature, and chemicals.
What the Cambridge 0610 syllabus says
2026-2028 syllabus, in our wordsWhat the syllabus expects you to be able to do in this topic, in plain English. Match the command word (Describe, Explain, State, etc.) in your answer to score full marks. For the exact wording, see the official syllabus (PDF).
- Describe Describe a sense organ as a group of receptor cells that respond to specific stimuli; the stimuli to know are chemicals, light, sound, temperature and touch.
- Identify Identify the parts of the eye on diagrams and images; only the blind spot, cornea, iris, lens, optic nerve, pupil and retina are required.
- Describe Describe what each of these parts of the eye does, limited to: (a) cornea: bends (refracts) light (b) iris: controls the amount of light entering the pupil (c) lens: focuses light onto the retina (d) retina: holds the light receptors, some of which respond to different colours of light (e) optic nerve: takes impulses to the brain
- Explain Explain the pupil reflex only in terms of how pupil diameter changes with light intensity.
- Explain Explain the pupil reflex using the antagonistic action of the radial and circular muscles of the iris. Supplement
- Explain Explain how the eye accommodates to see distant and near objects, in terms of: the ciliary muscles contracting or relaxing, the tension in the suspensory ligaments, the lens shape, and how light is refracted. Supplement
- Describe Describe how rods and cones are distributed across the human retina. Supplement
- Outline Outline what rods and cones do, limited to: (a) rods are more sensitive than cones, which suits them to night vision (b) there are three kinds of cone, each absorbing a different colour of light, which together give colour vision Supplement
- Identify Identify where the fovea is on diagrams and images, and state what it does. Supplement
What is the general function of sense organs?
Sense organs are groups of receptor cells that respond to specific stimuli such as light, sound, touch, temperature, and chemicals.
Name the structures of the eye.
The structures of the eye include: cornea, iris, pupil, lens, retina, optic nerve, and blind spot. Each structure has a specific role in vision.
What is the function of the cornea?
The cornea refracts (bends) light as it enters the eye, helping to focus the image onto the retina. The cornea is the first point of refraction in the eye.
What is the function of the iris?
The iris controls the amount of light entering the pupil by adjusting its size. In bright light, the iris constricts the pupil; in dim light, it dilates the pupil.
What is the function of the lens?
The lens focuses light onto the retina to create a clear image. It changes shape to allow focus on both near and distant objects, a process called accommodation.
What is the function of the retina?
The retina contains photoreceptor cells (rods and cones) that detect light and convert it into electrical signals. These signals are then sent to the brain via the optic nerve.
What is the function of the optic nerve?
The optic nerve carries electrical impulses from the retina to the brain, where they are interpreted as images. It connects the eye to the visual cortex.
Describe the pupil reflex in response to increased light intensity.
In bright light, circular muscles in the iris contract and radial muscles relax, causing the pupil to constrict. This reduces the amount of light entering the eye and protects the retina.
How does the eye accommodate for viewing near objects?
To focus on near objects, the ciliary muscles contract, reducing tension on the suspensory ligaments, making the lens thicker and more curved. This increases refraction of light.
How does the eye accommodate for viewing distant objects?
To focus on distant objects, the ciliary muscles relax, increasing tension on the suspensory ligaments, making the lens thinner and less curved. This reduces the refraction of light.
What is the function of rod cells in the retina?
Rod cells are highly sensitive to light and are responsible for night vision. They detect shades of gray and enable us to see in dim light conditions but do not detect colour.
What is the function of cone cells in the retina?
Cone cells are responsible for colour vision and function best in bright light. There are three types of cones, each sensitive to different wavelengths of light (red, green, or blue).
Key Questions: Sense organs
What is the general function of sense organs?
Sense organs are groups of receptor cells that respond to specific stimuli such as light, sound, touch, temperature, and chemicals.
Tips to avoid common mistakes in Sense organs
- ● Know the seven characteristics of living organisms (MRSGREN) inside and out, and don't confuse them with cell structures.
More topics in Unit 14 — Coordination and response
Sense organs sits alongside these Biology decks in the same syllabus unit. Each uses the same spaced-repetition system, so progress in one informs the next.
Cambridge syllabus keywords to use in your answers
These are the official Cambridge 0610 terms tagged to this section. Mark schemes credit responses that use the exact term — weave them into your answers verbatim rather than paraphrasing.
Key terms covered in this Sense organs deck
Every term below is defined in the flashcards above. Use the list as a quick recall test before your exam — if you can't define one of these in your own words, flip back to that card.
Related Biology guides
Long-read articles that go beyond the deck — cover the whole subject's common mistakes, high-yield content and revision pacing.
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