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Syllabus

The Biosphere — Syllabus

ICSE · Class 11 · Geography

What The Biosphere covers in ICSE Class 11 Geography: 4 topics, for the 2026-27 session. Part of the ICSE Class 11 Geography syllabus.

65 questions36 flashcards5 concepts

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4 Topics · ICSE Class 11 Geography · 2026-27

Topics in The Biosphere

1

1. Biosphere: meaning, position, and extent

  • The biosphere is that part of the earth which supports life and is known as its organic realm.
  • It lies at the interfaces between the three inorganic realms of the earth: lithosphere, atmosphere, and hydrosphere.
  • The biosphere is the most important realm for life because it contains human, animal, and plant life.
2

2. Ecology and ecosystem

  • Ecology is the science studying interactions between life forms and environment.
  • These interactions involve exchanges of matter, energy, and stimuli.
  • An ecosystem is the complex system of interactions between organisms and the physical environment in any unit of area.
3

3. Components of an ecosystem

  • Three components of ecosystems are generally recognised: energy component, biotic component, and abiotic component.
  • Energy is the ability to do work.
  • Energy is the essence of life and without energy transfers there could be no life or ecological systems.
4

4. Cycling of matter in ecosystems

  • Matter moves from one component of the ecosystem to another in a cyclic manner following distinct and consistent pathways.
  • Carbon, oxygen, nitrogen, and water move between the atmosphere, lithosphere, hydrosphere, and biosphere.
  • These elements never leave the total system of the planet earth.

Key Concepts

Central concept: Biosphere as the organic realm of the earth where life exists through interactions among living organisms and the physical environment

BiosphereLithosphereAtmosphereHydrosphereEcologyEcosystemComponents of ecosystemEnergy component

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Frequently Asked Questions

What are the important topics in The Biosphere for ICSE Class 11 Geography?
Key topics in The Biosphere include Biosphere: meaning, position, and extent, Ecology and ecosystem, Components of an ecosystem, Cycling of matter in ecosystems. Study these first, then practise questions on each for Class 11 exams.
How should I revise The Biosphere for Class 11 exams?
Learn the core ideas first, then work through the 65 practice questions on The Biosphere. 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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