ZIMSEC O-Level Biology
10Ecosystems
Ecosystems in ZIMSEC O-Level Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Topic150 practice questions7 lessons
In this topic
Lessons
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Ecosystems and soil
25 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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The carbon cycle
18 min
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The nitrogen cycle
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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