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ICSE Class 9 Environmental Science — Revision Notes

ICSE Class 9 Environmental Science revision notes, chapter by chapter across 11 chapters. Follows the ICSE / ISC syllabus.

How to Revise Effectively

  • Active recall: cover the notes, try to recall the key points, then check.
  • Spaced repetition: revise each chapter again after a day, then after a few days, then after a week or two.
  • Write, don't just read: writing key points and formulas out by hand helps them stick.
  • Teach someone: explaining an idea to a friend is a good test of whether you understand it.

Chapter-Wise Revision Notes — 11 Chapters

1

Overview of the Environment Around Us

4 topics
  • 1. Environment: Meaning and Scope
  • 2. Earth as a Life-Supporting Planet
  • 3. Major Components of the Environment
  • 4. Interaction Between Biotic and Abiotic Components
Environment includes all external conditionsEarth is the only known planetEarth revolves around the Sun atWater is known as the universalThe atmosphere is the envelope
Read the Overview of the Environment Around Us notes
2

Natural Processes and Biogeochemical Cycles

4 topics
  • 1. Biological Processes Supporting Life
  • 2. Photosynthesis
  • 3. Factors Affecting Photosynthesis
  • 4. Decomposition
Photosynthesis is the biological process byDecomposition is the biological process byAdaptation is the gradual evolutionary processCamel adaptations include a humpEvolution is the gradual genetic change
Read the Natural Processes and Biogeochemical Cycles notes
3

Biodiversity

4 topics
  • 1. Meaning and Types of Biodiversity
  • 2. Genetic Diversity and Conservation
  • 3. Species Diversity and Its Measurement
  • 4. Indicator Species, Keystone Species, and Ecosystem Health
Biodiversity refers to the total varietyGenetic diversity is the variationSpecies diversity is the varietyEcosystem diversity is the varietyIndicator species reflect ecosystem health
Read the Biodiversity notes

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Frequently Asked Questions

Where can I find ICSE Class 9 Environmental Science Revision Notes?

This page has revision notes for 11 chapters of ICSE Class 9 Environmental Science for the 2026-27 session. Each chapter links to its own page with the full set.

Go through the syllabus first, then work chapter by chapter: learn the ideas, practise questions, and revise with notes and flashcards. Leave time at the end to revise every chapter once more under timed conditions.

Browse Revision Notes by Chapter

11 chapters

1

Overview of the Environment Around Us

2

Natural Processes and Biogeochemical Cycles

3

Biodiversity

4

Ecosystems - Structure, Functions, and Services

5

India's Environmental Heritage

6

Human Development - Historical Perspective, Industrialisation, and Urbanisation

7

Modern Agriculture Practices

8

Consequences of Unsustainable Development

9

Triple Planetary Crisis

10

Sustainable Development: Introduction, Approach and Environment Ethics

11

Sustainable Handprint Actions

More Environmental Science Resources

ICSE Class 9

Practice Quiz

Test yourself with quick quizzes

Important Questions

Exam-style questions with answers

Chapter Summary

Understand each chapter at a glance

Concept Maps

Diagrams showing how topics connect

Study Plan

Week-by-week preparation schedule

Flashcards

Quick-fire cards for active recall practice

Syllabus

Chapter list and the topics in each

Other ICSE Class 9 Subjects

MathematicsPhysicsChemistryBiologyGeographyHistory & CivicsEnglish Language - ArcherEconomics