1. Which food is a good source of protein?
- Rice
- Lentils (daal)
- Sugar
- Butter
Answer: B) Lentils (daal)
Explanation: Pulses are rich in protein. O Level Biology · Topic 8 Human Nutrition · 8.1 Diet
MCQs / Biology / O Level Biology: Human Nutrition
O Level Biology: Human Nutrition MCQs — Biology
32 multiple-choice questions on O Level Biology: Human Nutrition from Biology, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.
2. Villi have walls one cell thick so that
- they make enzymes
- they can contract
- nutrients have a short distance to diffuse
- they store fat
Answer: C) nutrients have a short distance to diffuse
Explanation: Thin walls mean short diffusion distances. O Level Biology · Topic 8 Human Nutrition · 8.3 Absorption and assimilation
3. Pepsin and trypsin work best at different pH values because
- they work in different parts of the gut
- bile denatures pepsin
- they are both lipases
- they digest different foods
Answer: A) they work in different parts of the gut
Explanation: Stomach is acidic; duodenum is nearly neutral. O Level Biology · Topic 8 Human Nutrition · 8.2 Human digestive system
4. Amylase breaks down starch into
- amino acids
- fatty acids
- maltose
- glucose only
Answer: C) maltose
Explanation: Amylase produces maltose. O Level Biology · Topic 8 Human Nutrition · 8.2 Human digestive system
5. The hardest layer of a tooth is
- enamel
- dentine
- cement
- pulp
Answer: A) enamel
Explanation: Enamel covers the crown. O Level Biology · Topic 8 Human Nutrition · 8.2 Human digestive system
6. Fibre is important in the diet because it
- provides most of our energy
- builds muscle
- is needed to make haemoglobin
- helps food move along the gut and prevents constipation
Answer: D) helps food move along the gut and prevents constipation
Explanation: Fibre adds bulk for peristalsis. O Level Biology · Topic 8 Human Nutrition · 8.1 Diet
7. Vitamin D helps the body to
- make haemoglobin
- clot blood only
- digest starch
- absorb calcium
Answer: D) absorb calcium
Explanation: Vitamin D aids calcium absorption. O Level Biology · Topic 8 Human Nutrition · 8.1 Diet
8. Which enzyme breaks maltose into glucose?
- Lipase
- Amylase
- Pepsin
- Maltase
Answer: D) Maltase
Explanation: Maltase acts on maltose. O Level Biology · Topic 8 Human Nutrition · 8.2 Human digestive system
9. Egestion is the
- removal of urea
- removal of undigested food as faeces
- release of enzymes
- taking in of food
Answer: B) removal of undigested food as faeces
Explanation: Egestion happens through the anus. O Level Biology · Topic 8 Human Nutrition · 8.2 Human digestive system
10. Chemical digestion is
- the absorption of food
- the removal of faeces
- the breakdown of large molecules into small molecules by enzymes
- the breaking of food into smaller pieces
Answer: C) the breakdown of large molecules into small molecules by enzymes
Explanation: Chemical digestion changes molecules. O Level Biology · Topic 8 Human Nutrition · 8.2 Human digestive system
11. Physical digestion helps chemical digestion by
- increasing the surface area for enzymes
- adding enzymes
- absorbing nutrients
- killing bacteria
Answer: A) increasing the surface area for enzymes
Explanation: Smaller pieces give enzymes more surface. O Level Biology · Topic 8 Human Nutrition · 8.2 Human digestive system
12. A balanced diet is one that
- contains all nutrients in the correct proportions
- has as much fat as possible
- contains only proteins
- contains no carbohydrates
Answer: A) contains all nutrients in the correct proportions
Explanation: Definition of a balanced diet. O Level Biology · Topic 8 Human Nutrition · 8.1 Diet
13. Scurvy is caused by a lack of
- vitamin C
- iron
- calcium
- vitamin D
Answer: A) vitamin C
Explanation: Vitamin C deficiency causes scurvy. O Level Biology · Topic 8 Human Nutrition · 8.1 Diet
14. Microvilli increase
- the pH of the intestine
- the length of the colon
- the amount of bile
- the surface area for absorption
Answer: D) the surface area for absorption
Explanation: Microvilli are tiny folds on lining cells. O Level Biology · Topic 8 Human Nutrition · 8.3 Absorption and assimilation
15. Proteins are needed in the diet for
- preventing scurvy
- providing fibre
- growth and repair
- making bile only
Answer: C) growth and repair
Explanation: Proteins build new cells and tissues. O Level Biology · Topic 8 Human Nutrition · 8.1 Diet
16. The function of hydrochloric acid in the stomach is to
- emulsify fats
- absorb water
- kill bacteria and give the right pH for pepsin
- digest starch
Answer: C) kill bacteria and give the right pH for pepsin
Explanation: HCl kills microbes and suits pepsin. O Level Biology · Topic 8 Human Nutrition · 8.2 Human digestive system
17. Rickets can be caused by a lack of
- vitamin D or calcium
- iron only
- protein or fibre
- vitamin C or iron
Answer: A) vitamin D or calcium
Explanation: Both vitamin D and calcium are needed for strong bones. O Level Biology · Topic 8 Human Nutrition · 8.1 Diet
18. A person with pale skin who is always tired may have anaemia caused by lack of
- vitamin C
- water
- fibre
- iron
Answer: D) iron
Explanation: Anaemia = too little haemoglobin, from iron deficiency. O Level Biology · Topic 8 Human Nutrition · 8.1 Diet
19. Lipase digests lipids into
- fatty acids and glycerol
- glucose
- maltose
- amino acids
Answer: A) fatty acids and glycerol
Explanation: Lipase products are fatty acids and glycerol. O Level Biology · Topic 8 Human Nutrition · 8.2 Human digestive system
20. Fatty acids and glycerol are absorbed into the
- colon
- capillaries only
- lacteal
- hepatic artery
Answer: C) lacteal
Explanation: The lacteal absorbs products of fat digestion. O Level Biology · Topic 8 Human Nutrition · 8.3 Absorption and assimilation
21. Which nutrient is the main source of energy?
- Calcium
- Vitamin C
- Protein
- Carbohydrate
Answer: D) Carbohydrate
Explanation: Carbohydrates are the main energy source. O Level Biology · Topic 8 Human Nutrition · 8.1 Diet
22. Peristalsis is
- the digestion of protein
- waves of muscle contraction that move food along the gut
- chewing food
- the absorption of fat
Answer: B) waves of muscle contraction that move food along the gut
Explanation: Circular and longitudinal muscles contract in waves. O Level Biology · Topic 8 Human Nutrition · 8.2 Human digestive system
23. Where is bile made?
- Liver
- Pancreas
- Stomach
- Gall bladder
Answer: A) Liver
Explanation: Bile is made in the liver and stored in the gall bladder. O Level Biology · Topic 8 Human Nutrition · 8.2 Human digestive system
24. Which teeth are chisel-shaped for biting?
- Incisors
- Molars
- Premolars
- Canines
Answer: A) Incisors
Explanation: Incisors cut and bite. O Level Biology · Topic 8 Human Nutrition · 8.2 Human digestive system
25. The nerve and blood vessels of a tooth are found in the
- enamel
- cement
- crown
- pulp cavity
Answer: D) pulp cavity
Explanation: The pulp contains nerves and blood vessels. O Level Biology · Topic 8 Human Nutrition · 8.2 Human digestive system
Page 1 of 2 Next
Practise O Level Biology: Human Nutrition MCQs
More Biology chapters
- O Level Biology: Cells MCQs
- O Level Biology: Classification MCQs
- O Level Biology: Movement into and out of Cells MCQs
- O Level Biology: Biological Molecules MCQs
- O Level Biology: Enzymes MCQs
- O Level Biology: Plant Nutrition MCQs
- O Level Biology: Transport in Flowering Plants MCQs
- O Level Biology: Human Gas Exchange MCQs
- O Level Biology: Respiration MCQs
- O Level Biology: Transport in Humans MCQs
- O Level Biology: Disease and Immunity MCQs
- O Level Biology: Excretion MCQs