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Sense Organs

ICSE · Class 10 · Biology

Quick revision notes for Sense Organs — ICSE Class 10 Biology. Key concepts, formulas, and definitions for last-minute revision.

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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Key Topics to Revise

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.
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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.
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3. Photoreceptors and Image Formation

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

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Full Notes

Key Concepts

Sense organs receive external or internalA stimulus is a changeExteroceptors are present outside the bodyThe eye has three coatsThe retina contains rods and cones

Frequently Asked Questions

What are the important topics in Sense Organs for ICSE Class 10 Biology?
Sense Organs covers several key topics that are frequently asked in ICSE Class 10 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Sense Organs — ICSE Class 10 Biology?
Understand the core concepts first, then work through the 42 practice questions available for this chapter. Revise formulas and 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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