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Science Quiz - Digestion 01 (Questions)

Digestion breaks food into smaller parts your body can use. In KS3 Science, you’ll learn how enzymes, organs, and systems work together to process nutrients.

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(quiz starts below)

Fascinating Fact:

Digestion starts in the mouth, where enzymes in saliva begin breaking down food.

In KS3 Science, the digestive system is studied to understand how food is broken down into nutrients. These nutrients provide energy, repair tissues, and keep the body functioning well.

Key Terms

  • Enzyme: A protein that speeds up chemical reactions, such as breaking food into smaller molecules.
  • Nutrient: A substance from food that the body needs for energy, growth, and repair.
  • Absorption: The process where digested food passes into the blood to be used by the body.

Frequently Asked Questions (Click to see answers)

Where does digestion begin in KS3 Science?

Digestion begins in the mouth, where teeth break food into smaller pieces and enzymes in saliva start breaking down starch into sugar molecules.

What is the role of enzymes in digestion?

Enzymes act as biological catalysts that speed up digestion by breaking large food molecules, like proteins and carbohydrates, into smaller, absorbable ones.

How are nutrients absorbed into the body?

Nutrients are absorbed in the small intestine, where tiny villi transfer them into the bloodstream to supply energy and materials for growth and repair.

Try These Related Quizzes

1. Which of the following is NOT a type of tooth?
[ ] Canine
[ ] Feline
[ ] Incisor
[ ] Molar
2. Saliva is mixed with the food. It contains .......
[ ] acid
[ ] amylase
[ ] lipase
[ ] protease
3. Which of the following is NOT an enzyme?
[ ] Bile
[ ] Carbohydrase
[ ] Lipase
[ ] Protease
4. At which range of temperatures do enzymes work best?
[ ] 20-30°C
[ ] 30-40°C
[ ] 40-50°C
[ ] 60-70°C
5. Protease breaks down .......
[ ] fat
[ ] fibre
[ ] protein
[ ] starch
6. Lipase breaks down .......
[ ] fat
[ ] fibre
[ ] protein
[ ] starch
7. Starch is broken down into .......
[ ] amino acids
[ ] fatty acids
[ ] glucose
[ ] glycerol
8. Protein is broken down into .......
[ ] amino acids
[ ] fatty acids
[ ] glucose
[ ] glycerol
9. Which of the following organs is not part of the digestive system?
[ ] Heart
[ ] Liver
[ ] Pancreas
[ ] Stomach
10. Which of the following organs is not part of the digestive system?
[ ] Gut
[ ] Large intestine
[ ] Lungs
[ ] Small intestine

You can find more about this topic by visiting BBC Bitesize - Nutrition, digestion and excretion

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Science Quiz - Digestion 01 (Answers)
1. Which of the following is NOT a type of tooth?
[ ] Canine
[x] Feline
[ ] Incisor
[ ] Molar
Teeth break up food into smaller pieces
2. Saliva is mixed with the food. It contains .......
[ ] acid
[x] amylase
[ ] lipase
[ ] protease
Amylase starts the digestion of starch
3. Which of the following is NOT an enzyme?
[x] Bile
[ ] Carbohydrase
[ ] Lipase
[ ] Protease
Enzymes break down large molecules
4. At which range of temperatures do enzymes work best?
[ ] 20-30°C
[x] 30-40°C
[ ] 40-50°C
[ ] 60-70°C
Normal body temperature is 37°C
5. Protease breaks down .......
[ ] fat
[ ] fibre
[x] protein
[ ] starch
The names of enzymes usually ends in -ase
6. Lipase breaks down .......
[x] fat
[ ] fibre
[ ] protein
[ ] starch
They are broken down into fatty acids and glycerol
7. Starch is broken down into .......
[ ] amino acids
[ ] fatty acids
[x] glucose
[ ] glycerol
Glucose is a small molecule which is used by cells to release energy
8. Protein is broken down into .......
[x] amino acids
[ ] fatty acids
[ ] glucose
[ ] glycerol
These are required to make new cells for your body
9. Which of the following organs is not part of the digestive system?
[x] Heart
[ ] Liver
[ ] Pancreas
[ ] Stomach
The heart is part of the circulatory system
10. Which of the following organs is not part of the digestive system?
[ ] Gut
[ ] Large intestine
[x] Lungs
[ ] Small intestine
The lungs are part of the respiratory system
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