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Natural Processes and Biogeochemical Cycles — Revision Notes

ICSE · Class 9 · Environmental Science

Natural Processes and Biogeochemical Cycles revision notes for ICSE Class 9 Environmental Science: 4 topics in quick points.

65 questions52 flashcards5 concepts

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Key Topics to Revise

1

1. Biological Processes Supporting Life

  • Photosynthesis produces food and oxygen.
  • Decomposition recycles nutrients back into the environment.
  • Adaptation helps organisms survive in different habitats.
2

2. Photosynthesis

  • Photosynthesis takes place in chloroplasts which contain chlorophyll, a green pigment that absorbs sunlight.
  • During photosynthesis, water molecules split into hydrogen and oxygen through photolysis.
  • Oxygen released during photosynthesis exits through the stomata.
3

3. Factors Affecting Photosynthesis

  • Light intensity affects the rate of photosynthesis.
  • Carbon dioxide concentration affects the rate of photosynthesis.
  • Water availability is essential for photosynthesis.
4

4. Decomposition

  • Decomposition breaks dead organic matter into simpler inorganic substances.
  • Microorganisms such as bacteria and fungi carry out decomposition.
  • The stages of decomposition are fragmentation, leaching, catabolism, humification, and mineralisation.

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Full Notes

Key Concepts

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

Frequently Asked Questions

What are the important topics in Natural Processes and Biogeochemical Cycles for ICSE Class 9 Environmental Science?
Key topics in Natural Processes and Biogeochemical Cycles include Biological Processes Supporting Life, Photosynthesis, Factors Affecting Photosynthesis, Decomposition. Study these first, then practise questions on each for Class 9 exams.
How should I revise Natural Processes and Biogeochemical Cycles for Class 9 exams?
Learn the core ideas first, then work through the 65 practice questions on Natural Processes and Biogeochemical Cycles. 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 ICSE Class 9 Environmental Science Revision Notes

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