ZIMSEC O-Level Biology
8.10.2Natural ecosystem
Natural ecosystem in ZIMSEC O-Level Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic87 practice questions4 lessons
Overview
Form 3.
Learning objectives
What the syllabus expects you to be able to do.
- 8.10.2.1Construct and interpret food chains and food webs using trophic levels (producers, consumers, decomposers).
- 8.10.2.2Explain how energy is lost along food chains (respiration, heat) and interpret pyramids of numbers, biomass and energy.
- 8.10.2.3Describe the carbon and nitrogen cycles.
Lessons
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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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The carbon cycle
18 min
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The nitrogen cycle
18 min
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Sample question
A sample question on this topic. Answer it, check it, then read the worked answer.
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