Q1
What is an ecosystem?
AOrganisms and environment interacting together
BOnly living organisms
COnly the physical environment
DNothing specific
ICSEClass 8 (ICSE)ScienceCh 21 · Topic 1
Ecosystems
An ecosystem includes living organisms and their physical environment interacting together, forming food chains, food webs, and nutrient cyc
Core concept
A food chain shows energy flow from one organism to another, like grass to a grasshopper to a frog to a snake.
How it works
A food web combines multiple food chains, showing more complex, realistic feeding relationships within an ecosystem.
Why it matters
Nutrient cycles, like the carbon cycle and nitrogen cycle, show how essential elements move through living things and the environment.
Key detail
Understanding ecosystems helps us see how all living things are interconnected and why protecting biodiversity is important.
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• An ecosystem includes organisms and environment interacting.
• A food chain shows energy flow between organisms.
• Example: grass to grasshopper to frog to snake.
• A food web combines multiple food chains.
• It shows more complex feeding relationships.
• Nutrient cycles include carbon and nitrogen cycles.
• These show element movement through nature.
• Ecosystems show interconnection and biodiversity importance.