ZIMSEC O-Level Combined Science
7.1Biology
In this topic
Lessons
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Inspired and expired air, and breathing during exercise
18 min
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Tests for gases
25 min
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The breathing system and ventilation
18 min
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Carbohydrates, proteins and lipids
22 min
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Food tests
25 min
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Malnutrition and deficiency diseases
22 min
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Nutrients and a balanced diet
22 min
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Health, hygiene and the spread of disease
25 min
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Pathogens, transmission and disease control
20 min
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Waste disposal, reuse and recycling
35 min
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Apparatus and measurement in the chemistry laboratory
30 min
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Laboratory safety and hazard symbols
18 min
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Plant, animal and bacterial cells
22 min
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Specialised cells and levels of organisation
20 min
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Asexual and sexual reproduction
30 min
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Fertilisation and germination in flowering plants
25 min
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Flowers and pollination
30 min
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Seed structure and dispersal
22 min
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Diffusion and active transport
24 min
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Osmosis
25 min
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