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Nutrient Cycles, Ecological Succession, and Biomes — Syllabus

ICSE · Class 11 · Environmental Science

What Nutrient Cycles, Ecological Succession, and Biomes covers in ICSE Class 11 Environmental Science: 4 topics, for the 2026-27 session.

65 questions38 flashcards5 concepts

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4 Topics · ICSE Class 11 Environmental Science · 2026-27

Topics in Nutrient Cycles, Ecological Succession, and Biomes

1

Nutrient Cycles

  • Nutrient cycling is also called biogeochemical cycling.
  • Nutrient cycles refer to the continuous movement and recycling of essential chemical elements between the biotic components and the abiotic components of the environment.
  • Every ecosystem has three main nutrient pools: reservoir pool, exchange pool, and biotic pool.
2

Major Nutrient Cycles

  • The main nutrient cycles are carbon, nitrogen, hydrological, and phosphorus cycles.
  • The carbon cycle controls the movement of carbon between the atmosphere, living organisms, soil, and oceans.
  • Carbon cycle processes are biological: photosynthesis, respiration, and decomposition; and geological: fossilisation and volcanic activity.
3

Law of Tolerance and Human Impact

  • The Law of Tolerance states that every species can only survive within a specific range of environmental conditions.
  • The main conditions include temperature, pH, water availability, and nutrient levels.
  • If conditions go beyond tolerance limits, a species may fail to survive in that environment.
4

Ecological Succession

  • Ecological succession is the natural, gradual process by which ecosystems change and develop over time.
  • There are two main types of succession: primary succession and secondary succession.
  • Primary succession occurs in an area where no soil or living organisms exist initially.

Key Concepts

Central concept: Ecological organisation and change in ecosystems through nutrient cycling, succession, and biomes

Nutrient CyclesEcological SuccessionBiomesEcosystem Services

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Frequently Asked Questions

What are the important topics in Nutrient Cycles, Ecological Succession, and Biomes for ICSE Class 11 Environmental Science?
Key topics in Nutrient Cycles, Ecological Succession, and Biomes include Nutrient Cycles, Major Nutrient Cycles, Law of Tolerance and Human Impact, Ecological Succession. Study these first, then practise questions on each for Class 11 exams.
How should I revise Nutrient Cycles, Ecological Succession, and Biomes for Class 11 exams?
Learn the core ideas first, then work through the 65 practice questions on Nutrient Cycles, Ecological Succession, and Biomes. 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 11 Environmental Science Syllabus

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