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Syllabus

Sense Organs — Syllabus

ICSE · Class 10 · Biology

What Sense Organs covers in ICSE Class 10 Biology: 4 topics, for the 2026-27 session. Part of the ICSE Class 10 Biology syllabus.

42 questions44 flashcards5 concepts

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A flowchart illustrating the pathway from stimulus detection by a receptor (sense organ) to the brain's interpretation and the body's response via an effector.
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4 Topics · ICSE Class 10 Biology · 2026-27

Topics in Sense Organs

1

1. Sense Organs, Stimulus and Response

  • Sense organs receive external or internal changes and are called receptors.
  • A stimulus is a change in the environment or within the body which produces response.
  • An effector is a body part whose activity leads to a response. It may be muscles or glands.
2

2. Structure of the Eye

  • The eye is a hollow, spherical structure.
  • About one-fifth of an eyeball is visible externally.
  • Each eye is kept in a fixed position in its orbit by six muscles called ocular or eyeball muscles.
3

3. Photoreceptors and Image Formation

  • Eyes are photoreceptors.
  • Retina contains rods containing photosensitive pigment rhodopsin, also called visual purple.
  • Rods enable vision in darkness.
4

4. Common Defects of Vision

  • The eye is normal if parallel rays from an object at about 6 metres are focused on the retina.
  • Myopia is a defect in which near objects are seen clearly but distant objects are not seen clearly.
  • In myopia, the image of a distant object is formed in front of the retina.

Key Concepts

Central concept: Sense organs are specialized receptors that detect stimuli and help the body produce a suitable response through the brain and effectors.

Receptors, stimulus, response, effectorTypes of receptorsEyes as photoreceptorsStructure of the eyeImage formation and accommodationCommon defects of visionEar as statoacoustic organStructure of the ear

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Frequently Asked Questions

What are the important topics in Sense Organs for ICSE Class 10 Biology?
Key topics in Sense Organs include Sense Organs, Stimulus and Response, Structure of the Eye, Photoreceptors and Image Formation, Common Defects of Vision. Study these first, then practise questions on each for the ICSE Class 10 board exam.
How should I revise Sense Organs for the ICSE Class 10 board exam?
Learn the core ideas first, then work through the 42 practice questions on Sense Organs. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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