ZIMSEC O-Level Biology
8.6.1Nutrition
Nutrition in ZIMSEC O-Level Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic159 practice questions7 lessons
Overview
Form 3. Includes digestion, teeth, absorption and assimilation (no separate 8.6.2 heading was found).
Learning objectives
What the syllabus expects you to be able to do.
- 8.6.1.1Describe a balanced diet, the sources and functions of nutrients, and how nutrient requirements vary with age, sex and activity.
- 8.6.1.2Describe malnutrition, including deficiency diseases and the effects of too much fat and carbohydrate.
- 8.6.1.3Identify the regions of the alimentary canal and the associated organs, state their functions and describe ingestion, mechanical digestion, peristalsis, chemical digestion, absorption, assimilation and egestion.
- 8.6.1.4Describe the actions of amylase, protease and lipase and the roles of hydrochloric acid, rennin and bile.
- 8.6.1.5Describe how the small intestine is adapted for absorption, absorption by diffusion and active uptake, the role of the hepatic portal vein and the roles of the large intestine.
- 8.6.1.6Define assimilation and outline the roles of the liver in metabolism, such as regulating glucose and amino acids, breaking down alcohol and toxins, and storing glycogen, fat and vitamins A and D.
- 8.6.1.7Describe the types, functions and structure of teeth, the causes of tooth decay and how teeth are cared for.
Lessons
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Absorption and assimilation
20 min
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Chemical digestion and digestive enzymes
18 min
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Diffusion and active transport
24 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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Teeth and physical digestion
22 min
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The digestive system
18 min
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Sample question
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