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Ecosystems

ICSE · Class 8 · Biology

Quick revision notes for Ecosystems — ICSE Class 8 Biology. Key concepts, formulas, and definitions for last-minute revision.

44 questions30 flashcards5 concepts

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A diagram illustrating the biotic and abiotic components of an ecosystem and their interactions.
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Key Topics to Revise

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1. Ecosystem and Its Components

  • An ecosystem is a self-contained area composed of all the different organisms living in it, interacting with each other, as well as interacting with the physical conditions such as sunlight, air, wate
  • The term ecosystem is derived from the Greek word Oikos, meaning house.
  • A forest ecosystem contains living components and non-living components.
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2. Trophic Levels, Producers, and Consumers

  • Food in an ecosystem moves through trophic levels, which are food-obtaining steps in a food chain.
  • Trophic level 1 consists of green plants, which are producers.
  • Trophic level 2 consists of herbivores or primary consumers.
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3. Food Chains

  • Food chain is the linear sequence of organisms in which each organism eats the lower member and is itself eaten by the next higher member.
  • A food chain may have 2 to 5 steps, very rarely 6, but never 7.
  • Some examples of food chains are Rice → Man, Grass → Rabbit → Fox, Maize → Goat → Man, Maize → Goat → Lion, Grass → Grasshopper → Lizard → Crow, and Grass → Buffalo → Leech.
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4. Food Webs and Their Importance

  • Food web is a network of several interconnecting food chains.
  • Food webs are complex and show many alternative feeding links.
  • The food web allows organisms to have more than one food source or more than one predator.

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Full Notes

Key Concepts

An ecosystem is a selfBiotic components are living partsGreen plants are producers because theyAll organisms other than autotrophsA food chain is the linear

Frequently Asked Questions

What are the important topics in Ecosystems for ICSE Class 8 Biology?
Key topics in Ecosystems include Mind map showing the two main categories of ecosystem components—biotic (living) and abiotic (non-living)—with examples of each., Flowchart showing how green plants capture sunlight and convert it into food energy through photosynthesis, forming the base of the food chain., Flowchart showing how primary consumers (herbivores) eat plants and form the first step of the food chain.. These are the concepts ICSE Class 8 examiners draw on most — study them first, then practise related questions.
How to score full marks in Ecosystems — ICSE Class 8 Biology?
Understand the core concepts first, then work through the 44 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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All 9 chapters — ICSE Class 8 Biology Revision Notes

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