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Revision Notes

Understanding Ecosystems and Ecological Relationships

ICSE · Class 11 · Environmental Science

Quick revision notes for Understanding Ecosystems and Ecological Relationships — ICSE Class 11 Environmental Science. Key concepts, formulas, and definitions for last-minute revision.

65 questions49 flashcards5 concepts

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Key Topics to Revise

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1. Ecology, Ecosystem, and Components of an Ecosystem

  • Ecology is the branch of biology that deals with the study of interactions among organisms and between organisms and their environment.
  • An ecosystem is a functional and self-sustaining unit of nature in which living organisms interact with the non-living components of the environment.
  • An ecosystem can be natural or artificial.
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2. Trophic Levels, Food Chains, and Food Webs

  • Trophic relationships describe feeding connections in an ecosystem.
  • Each step in the transfer of food and energy is called a trophic level.
  • Producers form the first trophic level.
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3. Examples of Food Chains and Energy Flow

  • Grassland ecosystem: Grass → Grasshopper → Frog → Snake → Hawk.
  • Pond ecosystem: Phytoplankton → Zooplankton → Small fish → Large fish → Kingfisher.
  • Detritus food chain: Dead leaves → Earthworm → Frog → Snake → Eagle.
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4. 10% Law of Lindeman and Ecological Pyramids

  • The 10% Law of Lindeman is a principle that describes the inefficiency of energy transfer in ecosystems.
  • Only about 10% of the energy at one trophic level is passed on to the next trophic level.
  • About 90% of energy is lost at each trophic level due to metabolic processes, respiration, movement, heat loss, and excretion.

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Full Notes

Key Concepts

Ecology is the study of interactionsBiotic components include producersTrophic levels are the positions organismsA food chain is a linearA food web is a network

Frequently Asked Questions

What are the important topics in Understanding Ecosystems and Ecological Relationships for ICSE Class 11 Environmental Science?
Understanding Ecosystems and Ecological Relationships covers several key topics that are frequently asked in ICSE Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Understanding Ecosystems and Ecological Relationships — ICSE Class 11 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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