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Ecosystems - Structure, Functions, and Services — Revision Notes

ICSE · Class 9 · Environmental Science

Ecosystems - Structure, Functions, and Services revision notes for ICSE Class 9 Environmental Science: 4 topics in quick points.

80 questions40 flashcards5 concepts

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Key Topics to Revise

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1. Concept and Hierarchy of Ecology

  • Ecology is the branch of science studying interactions between living organisms and their physical environment, and their interdependence maintaining ecological balance.
  • The term ecology was first used in 1866 by Ernst Haeckel.
  • Ecology is derived from Greek words: oikos meaning house or environment, and logos meaning study.
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2. Habitat and Ecological Niche

  • Habitat is the natural place where an organism lives and gets food, water, shelter, and suitable conditions.
  • Habitat refers to the physical surroundings such as a forest, desert, pond, or ocean.
  • Ecological niche is the functional role or position of an organism within its habitat.
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3. Ecological Disturbance and Threats

  • Ecosystem threats are long-term pressures causing permanent damage to ecosystems and biodiversity.
  • Major threats include habitat destruction, over-exploitation of resources, pollution, climate change, and invasive species.
  • These threats cause loss of species, disruption of food chains, reduced ecosystem services, and ecological imbalance.
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4. Types of Natural Ecosystems

  • Ecosystems are broadly classified into terrestrial and aquatic ecosystems.
  • Forests are classified into tropical forests, temperate forests, and taiga forests.
  • Grasslands are classified into tropical grasslands and temperate grasslands.

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Full Notes

Key Concepts

Ecology is the branch of scienceLiving systems are arranged from organismHabitat is the natural place whereEcosystem threats are longForests are dominated by trees

Frequently Asked Questions

What are the important topics in Ecosystems - Structure, Functions, and Services for ICSE Class 9 Environmental Science?
Key topics in Ecosystems - Structure, Functions, and Services include Concept and Hierarchy of Ecology, Habitat and Ecological Niche, Ecological Disturbance and Threats, Types of Natural Ecosystems. Study these first, then practise questions on each for Class 9 exams.
How should I revise Ecosystems - Structure, Functions, and Services for Class 9 exams?
Learn the core ideas first, then work through the 80 practice questions on Ecosystems - Structure, Functions, and Services. 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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