Primary 3 Science Human System Quiz

P3 Science Quiz: Human System (Body Parts & Functions)

Questions: 20
Time: 30 minutes
Total Marks: 40

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Section A: Multiple Choice (12 marks)

Choose the best answer and write 1, 2, 3 or 4 in the brackets. Each question carries 2 marks.

1. Which body system helps us breathe? (2 marks)

1. Digestive system
2. Respiratory system
3. Circulatory system
4. Muscular system

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2. The main function of the heart is to: (2 marks)

1. Help us think
2. Pump blood around the body
3. Digest food
4. Filter waste

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3. Which organ helps us digest food? (2 marks)

1. Lungs
2. Brain
3. Stomach
4. Heart

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4. We use our nose to: (2 marks)

1. See things
2. Hear sounds
3. Smell and breathe
4. Taste food

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5. Which body part protects our brain? (2 marks)

1. Skin
2. Skull
3. Ribs
4. Spine

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6. The five senses help us: (2 marks)

1. Digest food
2. Pump blood
3. Learn about our environment
4. Grow taller

( )

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Section B: Short Answer (14 marks)

Answer the questions clearly. Each question carries 2 marks unless stated.

7. Name the FIVE senses and the body part used for each. (5 marks)

Sense	Body Part
Sight	__________
Hearing	__________
Smell	__________
Taste	__________
Touch	__________

8. Match each body system to its main function: (4 marks)

Body System	Function
Respiratory	A. Digest and absorb food
Circulatory	B. Help us breathe
Digestive	C. Control body functions
Nervous	D. Transport blood and nutrients

Respiratory: _____ Circulatory: _____ Digestive: _____ Nervous: _____

9. Why is it important to exercise regularly? (2 marks)

Answer: _________________________________

10. What happens to food after we swallow it? (2 marks)

Answer: _________________________________

11. Name TWO ways we can take care of our teeth. (2 marks)

a) _________________________________

b) _________________________________

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Section C: Investigation & Application (14 marks)

Use your knowledge about human body systems to solve these problems.

12. Heart Rate Investigation: (6 marks)

Raj measured his heart rate (pulse) at different times:

Activity	Heart Rate (beats per minute)
Sitting quietly	70
Walking slowly	85
Running fast	120
After resting 5 minutes	75

Questions: a) When was Raj's heart rate the highest? Why? (2 marks)

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b) What happened to his heart rate after resting? Why? (2 marks)

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c) What does this tell us about how the heart works? (2 marks)

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13. Sense Investigation: (4 marks)

Mei Ling tested her senses with different objects:

Object	How she identified it
Apple	Sweet taste, crunchy sound when bitten
Perfume	_________________
Ice cube	Cold to touch, _________________
Music box	_________________

Complete the table by writing which senses were used. (4 marks)

14. Healthy Habits Challenge: (4 marks)

Ahmad wants to keep his body systems healthy. Give him advice for each system:

a) Respiratory system (breathing): (1 mark)

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b) Digestive system (food): (1 mark)

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c) Circulatory system (heart and blood): (1 mark)

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d) Nervous system (brain and nerves): (1 mark)

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Answer Key Summary:

1. Respiratory system (lungs help us breathe)
2. Pump blood around the body (heart's main function)
3. Stomach (main digestive organ)
4. Smell and breathe (nose functions)
5. Skull (protects brain like helmet)
6. Learn about our environment (gather information)
7. Eyes, Ears, Nose, Tongue, Skin
8. B, D, A, C
9. Keeps heart strong, muscles healthy, good for all body systems
10. Goes to stomach, gets digested, nutrients absorbed
11. Brush regularly, eat less sugary food, visit dentist 12a. Running - body needs more oxygen/energy 12b. Decreased - body doesn't need to work as hard 12c. Heart adjusts to body's needs
12. Sweet smell, see it melt, pleasant sound/melody 14a. Fresh air/exercise, b. Healthy food/balanced diet, c. Exercise regularly, d. Get enough sleep/learn new things

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~ End of Quiz ~

P3 Science Quiz: Human System (Body Parts & Functions) - ANSWERS

Questions: 20
Time: 30 minutes
Total Marks: 40

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Section A: Multiple Choice (12 marks)

Each question carries 2 marks.

1. Which body system helps us breathe? (2 marks)

Answer: 2 (Respiratory system)

Explanation: The respiratory system includes the lungs, nose, and windpipe that work together to help us breathe in oxygen and breathe out carbon dioxide.

2. The main function of the heart is to: (2 marks)

Answer: 2 (Pump blood around the body)

Explanation: The heart is a muscle that pumps blood to all parts of the body, carrying oxygen and nutrients to our organs and cells.

3. Which organ helps us digest food? (2 marks)

Answer: 3 (Stomach)

Explanation: The stomach is a main organ in the digestive system that breaks down food with stomach acid and digestive juices.

4. We use our nose to: (2 marks)

Answer: 3 (Smell and breathe)

Explanation: The nose has two functions - it helps us smell things and is also part of the respiratory system for breathing.

5. Which body part protects our brain? (2 marks)

Answer: 2 (Skull)

Explanation: The skull is hard bone that surrounds and protects our brain from injury, like a natural helmet.

6. The five senses help us: (2 marks)

Answer: 3 (Learn about our environment)

Explanation: Our senses (sight, hearing, smell, taste, touch) give us information about what's happening around us.

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Section B: Short Answer (14 marks)

Each question carries 2 marks unless stated.

7. Name the FIVE senses and the body part used for each. (5 marks)

Sense	Body Part
Sight	Eyes (1 mark)
Hearing	Ears (1 mark)
Smell	Nose (1 mark)
Taste	Tongue (1 mark)
Touch	Skin (1 mark)

8. Match each body system to its main function: (4 marks)

Respiratory: B (Help us breathe) (1 mark)
Circulatory: D (Transport blood and nutrients) (1 mark)
Digestive: A (Digest and absorb food) (1 mark)
Nervous: C (Control body functions) (1 mark)

9. Why is it important to exercise regularly? (2 marks)

Answer: Exercise keeps our heart strong, muscles healthy, and helps all body systems work better / Helps our body stay fit and healthy

Explanation: Exercise strengthens the heart, improves breathing, keeps muscles strong, and helps our body function properly.

10. What happens to food after we swallow it? (2 marks)

Answer: It goes to the stomach where it gets digested, then nutrients are absorbed by the body / The digestive system breaks it down and takes out nutrients

11. Name TWO ways we can take care of our teeth. (2 marks)

Possible answers (any 2): a) Brush teeth regularly / Brush twice daily (1 mark) b) Eat less sugary food / Visit dentist regularly / Floss teeth (1 mark)

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Section C: Investigation & Application (14 marks)

12. Heart Rate Investigation: (6 marks)

a) When was Raj's heart rate the highest? Why? (2 marks)

Answer: When running fast (120 bpm) because his body needed more oxygen and energy for exercise

b) What happened to his heart rate after resting? Why? (2 marks)

Answer: It decreased (to 75 bpm) because his body didn't need to work as hard when resting

c) What does this tell us about how the heart works? (2 marks)

Answer: The heart adjusts its pumping speed based on what the body needs / Heart beats faster when we need more oxygen

13. Sense Investigation: (4 marks)

Complete the table:

Object	How she identified it
Apple	Sweet taste, crunchy sound when bitten
Perfume	Sweet smell (sense of smell) (1 mark)
Ice cube	Cold to touch, can see it melting (sense of sight) (1 mark)
Music box	Pleasant sound/melody (sense of hearing) (2 marks)

14. Healthy Habits Challenge: (4 marks)

Advice for each system:

a) Respiratory system (breathing): (1 mark) Answer: Breathe fresh air / Exercise regularly / Avoid polluted air

b) Digestive system (food): (1 mark) Answer: Eat healthy, balanced diet / Eat fruits and vegetables / Drink enough water

c) Circulatory system (heart and blood): (1 mark) Answer: Exercise regularly / Eat healthy food / Avoid too much fatty food

d) Nervous system (brain and nerves): (1 mark) Answer: Get enough sleep / Learn new things / Keep brain active

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TOTAL: 40 MARKS

Scoring Guide:

• A: 32-40 marks (Excellent understanding of human body systems)
• B: 24-31 marks (Good understanding with minor gaps)
• C: 16-23 marks (Satisfactory, needs review of body functions)
• D: Below 16 marks (Requires additional support and practice)

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Key Learning Points:

Body Systems:

1. Respiratory: Lungs, nose, windpipe - for breathing
2. Circulatory: Heart, blood vessels - transport blood/nutrients
3. Digestive: Stomach, intestines - break down food
4. Nervous: Brain, nerves - control body functions

Five Senses:

• Sight: Eyes see shapes, colors, movement
• Hearing: Ears detect sounds and noises
• Smell: Nose detects different odors
• Taste: Tongue tastes sweet, sour, salty, bitter
• Touch: Skin feels hot, cold, rough, smooth

Healthy Habits:

• Exercise: Strengthens heart and muscles
• Balanced Diet: Provides nutrients for growth
• Good Hygiene: Prevents illness and infection
• Adequate Sleep: Helps body rest and repair
• Clean Environment: Protects respiratory system

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~ End of Answer Key ~