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Syllabus

Our Environment — Syllabus

CBSE · Class 10 · Science

What Our Environment covers in CBSE Class 10 Science: 4 topics, for the 2026-27 session. Part of the CBSE Class 10 Science syllabus.

59 questions64 flashcards5 concepts

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A diagram illustrating different trophic levels (T1, T2, T3, T4, T5) with examples of organisms at each level, often in a pyramid shape to hint at energy/biomass distribution.
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4 Topics · CBSE Class 10 Science · 2026-27

Topics in Our Environment

1

1. Ecosystem and Its Components

  • An ecosystem consists of biotic and abiotic components.
  • Biotic components are living organisms such as plants, animals, microorganisms, and human beings.
  • Abiotic components are non-living physical factors such as temperature, rainfall, wind, soil, and minerals.
2

2. Producers, Consumers, and Decomposers

  • Producers are autotrophs that make food from inorganic substances using solar energy in the presence of chlorophyll.
  • Green plants and certain bacteria are producers.
  • Producers occupy the first trophic level.
3

3. Food Chain, Trophic Levels, and Food Web

  • A food chain is a sequence of organisms where one organism is eaten by the next.
  • Each step or level in a food chain is called a trophic level.
  • Producers are at the first trophic level.
4

4. Energy Flow in an Ecosystem

  • Energy flow in an ecosystem is unidirectional.
  • Energy captured by autotrophs does not return to the Sun.
  • Energy passed to herbivores does not go back to autotrophs.

Key Concepts

Central concept: Environment as an interconnected system of biotic and abiotic components with energy flow, food relationships, chemical accumulation, ozone protection, and waste management

EcosystemProducersConsumersDecomposersFood chainFood webEnergy flowBiological magnification

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Frequently Asked Questions

What are the important topics in Our Environment for CBSE Class 10 Science?
Key topics in Our Environment include Ecosystem and Its Components, Producers, Consumers, and Decomposers, Food Chain, Trophic Levels, and Food Web, Energy Flow in an Ecosystem. Study these first, then practise questions on each for the CBSE Class 10 board exam.
How should I revise Our Environment for the CBSE Class 10 board exam?
Learn the core ideas first, then work through the 59 practice questions on Our Environment. 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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All CBSE Class 10 Science Syllabus

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