Skip to main content
Super TutorResources
Chapter 2 of 11
Syllabus

Natural Processes and Biogeochemical Cycles — Syllabus

ICSE · Class 9 · Environmental Science

What Natural Processes and Biogeochemical Cycles covers in ICSE Class 9 Environmental Science: 4 topics, for the 2026-27 session.

65 questions52 flashcards5 concepts

Interactive on Super Tutor

Studying Natural Processes and Biogeochemical Cycles? Get the full interactive chapter.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for syllabus and more.

Try Super Tutor — Free

Free trial, no card needed.

4 Topics · ICSE Class 9 Environmental Science · 2026-27

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

Work through every topic in Natural Processes and Biogeochemical Cycles with notes and quizzes

Start This Chapter

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.

More resources for Natural Processes and Biogeochemical Cycles

All ICSE Class 9 Environmental Science Syllabus

For serious students

Get the full Natural Processes and Biogeochemical Cycles chapter — start free.

Quizzes, flashcards, an AI doubt solver and a study plan for ICSE Class 9 Environmental Science. Free to start, no card needed.

Try Super Tutor Free
Try this chapter free