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Revision Notes

Our Environment

CBSE · Class 10 · Science

Quick revision notes for Our Environment — CBSE Class 10 Science. Key concepts, formulas, and definitions for last-minute revision.

55 questions20 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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Key Topics to Revise

1

Ecosystem Components

  • An ecosystem consists of biotic components (living organisms) and abiotic components (physical factors like temperature, rainfall, wind, soil)
  • Biotic components include producers (green plants), consumers (herbivores, carnivores, omnivores), and decomposers (bacteria and fungi)
  • Producers make their own food through photosynthesis using sunlight, water, and carbon dioxide
2

Food Chains and Food Webs

  • Food chain shows the flow of energy from one organism to another through feeding relationships
  • Each step in a food chain is called a trophic level
  • Trophic levels: Producers (1st) → Primary consumers (2nd) → Secondary consumers (3rd) → Tertiary consumers (4th)
3

Ozone Layer Depletion

  • Ozone (O₃) is formed by three oxygen atoms and is poisonous at ground level
  • Ozone layer in upper atmosphere protects Earth from harmful UV radiation
  • UV radiation can cause skin cancer and damage to living organisms
4

Waste Management

  • Human activities generate various types of waste materials daily
  • Biodegradable substances can be broken down by biological processes
  • Non-biodegradable substances cannot be broken down by living organisms

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Full Notes

Key Concepts

An ecosystem is a selfA food chain shows the linearTrophic levels represent the positionOnly about 10% of energyThe concentration of harmful chemicals like

Frequently Asked Questions

What are the important topics in Our Environment for CBSE Class 10 Science?
Our Environment covers several key topics that are frequently asked in CBSE 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 Our Environment — CBSE Class 10 Science?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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 13 chapters — CBSE Class 10 Science Revision Notes

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