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CIE iGCSE Co-Ordinated Science B7.1 Diet Exam Style Questions Paper 3

CIE iGCSE Co-Ordinated Science Paper 3 - All Chapters

Question

(a) Fig. 2.1 is a diagram of the human digestive system.
(i) Using letters A–G in Fig. 2.1, identify:
the anus 
the liver 
(ii) Using letters A–G in Fig. 2.1, identify an organ where these processes occur:
absorption 
digestion 
(b) Complete the sentences about digestion.
The breakdown of food into smaller pieces is called …………………… digestion.
This increases the surface area of the food.
The food is then broken down from large …………………… molecules to small …………………… molecules.
This is called …………………… digestion and produces molecules that can be absorbed.
(c) Table 2.1 shows the nutrition label from a bag of rice.
(i) Use Table 2.1 to calculate the percentage of protein in the rice.
(ii) Table 2.1 gives four types of nutrients needed for a healthy diet.
State one other type of nutrient needed for a healthy diet.

Most-appropriate topic codes (Cambridge IGCSE Co-ordinated Sciences 0654):

• Topic B7.2 — Digestive system (Part (a))
• Topic B7.3 — Digestion (Part (b))
• Topic B7.1 — Diet (Part (c))

▶️ Answer/Explanation

(a)(i) the anus: E ; the liver: G
The anus is the terminal opening of the alimentary canal, labelled E in the diagram. The liver is a large organ located above the stomach, labelled G.

(a)(ii) absorption: D or F ; digestion: A or B or F
Absorption of nutrients occurs mainly in the small intestine (D) and also in the large intestine (F). Digestion begins in the mouth (A), continues in the stomach and small intestine, and also occurs in the large intestine (F) where bacteria digest some material.

(b) physical / mechanical ; insoluble ; soluble ; chemical
Physical/mechanical digestion breaks food into smaller pieces, increasing surface area. Chemical digestion breaks down large insoluble molecules into small soluble molecules that can be absorbed through the intestinal wall into the blood.

(c)(i) Percentage of protein = (8.5 ÷ 235) × 100 = 3.6%
To calculate percentage, divide the mass of protein by the total mass of the rice and multiply by 100.

(c)(ii) Vitamins / minerals / water
A balanced diet requires vitamins, minerals (such as calcium and iron), and water in addition to carbohydrates, fats, proteins and fibre.

Question

(a) Fig. 7.1 is a diagram of the alimentary canal and associated organs.
(i) Identify the letter in Fig. 7.1 that represents the part:
where egestion occurs ………………………….
where most absorption of food molecules occurs ………………………….
that releases food into the small intestine ………………………….
(ii) State the names of parts A and C in Fig. 7.1.
(b) Circle the correct words in bold in the sentence to describe assimilation.
Assimilation is the movement of digested/insoluble food molecules into the cells/genes of the body where they are used.
(c) (i) The boxes on the left show principal sources of some nutrients. The boxes on the right show the names of some nutrients. Draw lines to link each principal source with the main nutrient it supplies.
(ii) List the chemical elements that make up carbohydrates.
(iii) Describe the importance of calcium in the diet.

Most-appropriate topic codes (Cambridge IGCSE Co-ordinated Sciences 0654):

• Topic B7.3 — Digestion (Parts (a), (b))
• Topic B7.1 — Diet (Part (c))

▶️ Answer/Explanation

(a)(i) F (egestion); D (absorption); B (releases food into small intestine)

Egestion (removal of undigested waste) occurs at the anus/rectum, labelled F.
Most absorption occurs in the small intestine, labelled D.
The stomach, labelled B, releases food into the small intestine.

(a)(ii) A – liver; C – pancreas

Part A is the liver, which produces bile.
Part C is the pancreas, which produces digestive enzymes.

(b) digested and cells

Assimilation is the movement of digested food molecules (not insoluble ones) into the cells of the body, where they are used.

(c)(i)

Butter is a fatty food, so it links to fat.
Rice is a starchy food, so it links to carbohydrate.
Tuna fish is a protein-rich food, so it links to protein.

(c)(ii) Carbon, hydrogen, oxygen

Carbohydrates are made up of only these three elements, in the ratio typically seen in sugars and starches.

(c)(iii) Calcium strengthens bones and teeth

Calcium is an important mineral required for building strong bones and teeth.
A deficiency can lead to weak or brittle bones.

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