Table 7.1 Shows the energy and nutrients contained in 100 g of five foods.

Food	Energy / KJ	Protein / g	Fat / g	Carbohydrate / g	Calcium / mg	Iron / mg	Vitamin C / mg	Vitamin D / mg
Apple	150	0.2	0.0	9.0	0	0.2	2	0.0
Chicken, roast	630	25.0	5.0	0.0	0	0.8	0	0.0
Egg, scrambled	1050	10.0	23.0	0.0	60	2.0	0	1.8
Rice, boiled	500	2.0	0.3	30.0	0	0.0	0	0.0
Spinach, boiled	130	5.0	0.5	1.5	600	4.0	25	0.0

Scrambled egg has the highest energy content per gram of all of the foods in the table. What data in Table 7.1 could explain why the energy content of scrambled egg is so high?

Table 7.1 shows the energy and nutrients contained in 100 g of the foods.

 A girl has anaemia. Which foods from the table would be most helpful for her to include in her diet? Explain your answer.

Table 7.1 shows the energy and nutrients contained in 100g of five foods.

Use the data in Table 7.1 to determine which of the five foods contains the greatest mass of water per 100 g. Show your working?

Figure shows the human digestive system.

Add each label to the appropriateness of the diagram. Some labels should be written in two places.

Labels to add

• Physical digestion, increases the surface area of food (two places)
• The gall bladder
• Amylase is secreted (two places)
• Amylase acts on starch (two places)
• Lipase breaks down fats
• Absorption happens
• Secretes a liquid with a low pH, which kills bacteria
• Protease is secreted (two places)

In an investigation into the absorption of vitamin D from the alimentary canal, a volunteer ate a measured quantity of vitamin D on a piece of roast. Blood samples were then taken from him at intervals over a period of 72 hours, and the concentration of vitamin D in each blood sample was measured.

The results are shown in the graph in figure 7.2.

Describe the changes in the concentration of vitamin D in the blood over the 72-hour period.