ZIMSEC O-Level Combined Science
7.1.2.3Ecosystems
Ecosystems in ZIMSEC O-Level Combined Science: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic150 practice questions7 lessons
Overview
Form 4.
Learning objectives
What the syllabus expects you to be able to do.
- 7.1.2.3.1Explain the term ecosystem and list its physical and biological components.
- 7.1.2.3.2Explain natural and artificial ecosystems such as forests, ponds, gardens and plantations.
- 7.1.2.3.3Construct food chains, food webs and pyramids of biomass.
- 7.1.2.3.4Explain how energy is lost along food chains and food webs.
- 7.1.2.3.5Describe the carbon and nitrogen cycles.
- 7.1.2.3.6Explain biodiversity, its advantages and the problems caused when it is limited.
Lessons
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Conservation and sustainable resources
20 min
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Energy flow and ecological pyramids
20 min
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Food chains and food webs
18 min
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Natural and artificial ecosystems and their management
19 min
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Populations, communities and ecosystems
20 min
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The carbon cycle
18 min
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The nitrogen cycle
18 min
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Sample question
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