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Natural Processes and Biogeochemical Cycles

ICSE · Class 9 · Environmental Science

Complete topic list for Natural Processes and Biogeochemical Cycles in ICSE Class 9 Environmental Science. Key concepts, sub-topics, and what to focus on for board exams.

65 questions52 flashcards5 concepts

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4 Topics · ICSE Class 9 Environmental Science

Topics in Natural Processes and Biogeochemical Cycles

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.

Key Concepts

Central concept: Life on Earth is sustained by interconnected natural biological processes and biogeochemical cycles

PhotosynthesisDecompositionAdaptationEvolutionCo-evolutionCoexistenceExtinction and extirpationCarbon cycle

Frequently Asked Questions

What are the important topics in Natural Processes and Biogeochemical Cycles for ICSE Class 9 Environmental Science?
Natural Processes and Biogeochemical Cycles covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Natural Processes and Biogeochemical Cycles — ICSE Class 9 Environmental Science?
Understand the core concepts first, then work through the 65 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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All 11 chapters — ICSE Class 9 Environmental Science Syllabus

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