Year 7 - Science
Food webs
Ecosystems
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores the interdependence of organisms in ecosystems, including food webs and insect-pollinated crops. It examines how organisms interact with their environment and the impact of toxic materials. It also highlights the importance of biodiversity and preserving genetic material.
Lesson Summary
You will learn to explain what is shown by a food web diagram and explain the effects that a change in the size of a population could have on other populations in the same community.
Key Notes
- A community of organisms is made up of interacting populations of species.
- A food web diagram represents several interconnected food chains within a community of organisms.
- A change in the size of a population will affect other populations in the food web.
Vocabulary To Learn
- habitat: A habitat is the place where an organism lives. It must provide food, shelter and a place to reproduce.
- population: A group of organisms of the same type in the same place is called a population.
- community: A community is made up of all the organisms that live in the same place.
- food chain: A food chain diagram shows how food is transferred from one population of organisms to another.
- food web: A food web diagram shows how all food chains interact with each other.
Common Mistakes To Avoid
- Changes in population within a food web will only impact organisms within the same food chain.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
A community of organisms is made up of interacting populations of species. A food web diagram represents several interconnected food chains within a community of organisms.
2. Define this scientific word and use it in context. 'habitat'
A habitat is the place where an organism lives. It must provide food, shelter and a place to reproduce. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Changes in population within a food web will only impact organisms within the same food chain. Correction: Exemplify that disappearance of one population could affect populations in all parts of the food web (CfU questions address this also).
More Lessons In This Unit
Browse all guides in the Year 7 Science guide library.