Human Nutrition

Worked examples (12)extended set

• 1Matching a deficiency disease to its cause and a food source (multiple choice)
• 2Sources and importance of the main nutrients
• 3Why water is essential in the diet
• 4Comparing a diet with recommended intakes (multiple choice)
• 5Spotting what a restricted diet is missing
• 6Using a food label
• 7Using a DCPIP calibration graph to compare fresh and stored juice
• 8Making standard vitamin C solutions and estimating a drink
• 9Why rickets cases rise in winter
• 10Fibre and the time food takes to pass through the gut
• 11Evaluating a teenager's day of meals
• 12Analysing a trial of scurvy treatments

Model answers (6)

• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) extended-response style

Worked examples (12)extended set

• 1Naming organs on a diagram of the digestive system
• 2Absorption or assimilation? (multiple choice)
• 3Completing a table of structures, letters and functions
• 4Locating functions on a lettered diagram
• 5Where each process happens (multiple choice)
• 6Which organs release secretions into the duodenum? (multiple choice)
• 7Classifying the five processes and egestion versus excretion
• 8What happens to absorbed amino acids
• 9Interpreting a bar chart of time spent in each region
• 10The gall bladder and ducts: a suggest question
• 11Gut length data from four mammals
• 12Effects of losing most of the ileum

Model answers (6)

• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) extended-response style

Worked examples (12)extended set

• 1Matching tooth types to their functions (multiple choice)
• 2What physical digestion is and why it helps
• 3Labelling a section through a tooth
• 4Teeth in an upper jaw: identify, count and give functions
• 5Where physical digestion happens (multiple choice)
• 6Surface area of food before and after chewing
• 7Which statement about physical digestion is correct? (multiple choice)
• 8Explaining how bile helps the digestion of fat
• 9Losing the back teeth: suggest the effects
• 10Investigating the effect of bile on fat digestion
• 11Cube size and time for digestion: graph and evaluation
• 12How much does emulsification increase surface area?

Model answers (6)

• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) extended-response style

Worked examples (12)extended set

• 1What chemical digestion is and why it is needed
• 2Enzyme, substrate and product (multiple choice)
• 3Maltase: substrate, product and site (multiple choice)
• 4Where digestive enzymes are secreted and where they act
• 5Pepsin and trypsin: reading an activity–pH graph
• 6pH along the gut: acid in the stomach, bile in the duodenum
• 7The two steps of starch digestion
• 8Why trypsin works in the duodenum but not the stomach
• 9A spotting tile experiment on amylase and pH
• 10Choosing food tests to show digestion
• 11Planning an investigation into pH and trypsin
• 12A blocked pancreatic duct: effects on digestion

Model answers (6)

• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) extended-response style

Worked examples (12)extended set

• 1Which molecule can be absorbed straight away? (multiple choice)
• 2Where water is absorbed: bar chart and percentages
• 3Labelling the structure of a villus
• 4The advantage of microvilli (multiple choice)
• 5Microvilli and lacteals on a drawing of the villus lining
• 6The roles of capillaries and lacteals in villi
• 7Where glucose is most concentrated in a villus (multiple choice)
• 8Why protein molecules are not absorbed
• 9Villus height data: percentage change and effects
• 10A Visking tubing model of absorption
• 11Modelling the surface area added by villi and microvilli
• 12Fat in the lymph after a fatty meal

Model answers (6)

• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) extended-response style