Home› ICSE Revision› Grade 8› Biology› Ecosystems

Ecosystems

How organisms in an ecosystem interact with each other and with sunlight, air, water and soil — mainly to eat and be eaten.

Register

What this chapter covers

  1. Ecosystem and Its Components

    ▼
    • Ecosystem ConceptOrganisms interacting with their physical conditions.
    • Forest EcosystemDense trees, shrubs and grasses: autotrophs.
    • Biotic ComponentsProducers, consumers, scavengers, detritivores, decomposers.
    • Abiotic ComponentsSunlight, air, water, temperature and soil.

  2. Food Chains, Food Webs and Food Pyramids

    ▼
    • Food ChainsLinear sequence starting with a producer.
    • Food WebsInterconnecting chains; more stable than chains.
    • Food PyramidsPyramids of numbers and of biomass.

  3. Interdependence Between Organisms

    ▼
    • SymbiosisBoth partners benefit from living together.
    • ParasitismParasite takes food, shelter; host harmed.
    • PredationPredator catches and kills its prey.

  4. Flora and Fauna of Forest Ecosystem

    ▼
    • Types of ForestsTropical rain, temperate deciduous and coniferous.
    • Forests of IndiaGir, Jim Corbett and Jaladpara.
    • Ecosystem ConservationProtect wildlife, rivers, forests and resources.

Try a sample question

What is the chief advantage of a food web over a single food chain in an ecosystem?

Other Biology chapters

💉

Endocrine Systems

Hormones, pituitary gland, adolescence, hygiene and stress management.

 💓

Circulatory Systems

Heart, blood vessels, double circulation, lymph and ABO blood groups.

 🧠

Nervous System

Neurons, brain, spinal cord, reflex action and the autonomic nervous system.
See all Biology chapters

Revise Ecosystems with My Revision Deck

Create a free account to get access to quizzes, mind maps and printable test papers with answer keys, and subscribe for chapter worksheets. Selected chapters are free to try — no payment needed.

Create a free account