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Primary 4 Science Systems Quiz

Free P4 Science Systems quiz, HY3 Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.

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Primary 4 Science From Real Exams Generated by Tencent HY3 Free Updated 2026-07-10

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Questions

Primary 4 Science Quiz - Systems

Name: ___________________________
Class: ___________________________
Date: ___________________________
Score: ___________ / 40

Duration: 50 minutes
Total Marks: 40

Instructions:

This quiz has 20 questions on the topic of Systems (Plant System and Human Digestive System).
Section A: 10 multiple-choice questions (1 mark each).
Section B: 6 short-answer questions (2 marks each).
Section C: 4 structured questions with subparts (total 8 marks).
Write your answers clearly in the spaces provided.

Section A (Questions 1–10, 1 mark each)

Which of the following is NOT a part of a plant system?
A) Leaf
B) Stem
C) Root
D) Stomach
The root of a plant helps to
A) make food
B) absorb water and minerals from the soil
C) carry food to the leaves
D) hold the plant up only
Which human body system breaks down food into small pieces that the body can use?
A) Respiratory system
B) Digestive system
C) Circulatory system
D) Skeletal system
Food passes from the mouth to the stomach through the
A) small intestine
B) large intestine
C) gullet
D) liver
Which part of the plant uses sunlight to make food?
A) Root
B) Stem
C) Leaf
D) Flower
The stomach is part of the
A) plant system
B) human digestive system
C) respiratory system
D) muscular system
Which of the following is a function of the stem?
A) Absorb water from the soil
B) Carry water and food to different parts of the plant
C) Make food using sunlight
D) Release oxygen into the air
The small intestine’s main job is to
A) store waste
B) absorb nutrients from digested food
C) chew food
D) push food to the mouth
Which of these is NOT one of the five human body systems named in Primary 4?
A) Digestive
B) Respiratory
C) Excretory
D) Skeletal
A bean plant has a short stem and green leaves. Which part keeps it from falling over?
A) Leaf
B) Root
C) Flower
D) Seed

Section B (Questions 11–16, 2 marks each)

State the function of the leaf in a plant system.
Name two human body systems (other than the digestive system) and state one function of each.
(a) ___________________________________________________
(b) ___________________________________________________
Arrange these parts of the human digestive system in the correct order from start to end:
stomach, mouth, small intestine, gullet, large intestine
Explain why the root is important for a plant to survive.
The diagram below shows a plant.

Diagram for Q15 (P4 Science)

Generated diagram for Q15.

Label the parts that absorb water and the part that makes food. (2 marks)  
Water absorber: _________________  
Food maker: ___________________

16. State one function of the large intestine.
_______________________________________________________
_______________________________________________________

Section C (Questions 17–20, structured)

(a) Name the human system that includes the mouth, stomach and intestines. (1 mark)

(b) State why this system is important for the body. (1 mark)
(a) Identify two parts of a plant system. (1 mark)

(b) For each part identified in (a), state its function. (1 mark)
The picture shows the human digestive system.

Diagram for Q19 (P4 Science)

Generated diagram for Q19.

(a) Name the part that connects the mouth to the stomach. (1 mark)  
_________________________  
(b) Which part absorbs most nutrients from food? (1 mark)  
_________________________

20. (a) List three human body systems learnt in Primary 4. (1 mark)
___________________________________________________
(b) State one way the skeletal and muscular systems work together. (1 mark)
___________________________________________________

Answers

Primary 4 Science Quiz - Systems (Answer Key)

Total Marks: 40
Topic: Systems (Plant System & Human Digestive System)

Section A Answers (1 mark each)

D) Stomach
Teaching note: Stomach is part of the human digestive system, not a plant part. Plant system parts are leaf, stem, root.
B) absorb water and minerals from the soil
Teaching note: Roots anchor the plant and take in water and dissolved minerals from the soil for the plant to use.
B) Digestive system
Teaching note: The digestive system breaks food down so the body can absorb and use it for energy and growth.
C) gullet
Teaching note: After chewing in the mouth, food goes down the gullet (also called food pipe) into the stomach.
C) Leaf
Teaching note: Leaves contain green material that uses sunlight to make food for the plant (simple understanding at P4).
B) human digestive system
Teaching note: Stomach is an organ in the human digestive system, not in plants or other systems listed.
B) Carry water and food to different parts of the plant
Teaching note: Stem acts like a transport tube between roots and leaves.
B) absorb nutrients from digested food
Teaching note: Small intestine absorbs useful nutrients into the body after stomach breaks food down.
C) Excretory
Teaching note: P4 names five systems: digestive, respiratory, circulatory, skeletal, muscular. Excretory is not in the P4 list.
B) Root
Teaching note: Roots hold the plant firmly in the soil so it does not fall.

Section B Answers (2 marks each)

Function of leaf: Makes food for the plant (using sunlight). (2 marks)
Marking: 1 mark for "makes food", 1 mark for mention of sunlight or general food production.
Teaching note: Leaf is the food-making factory of the plant system.
Two systems and functions (2 marks, 1 per correct pair):
Example: Respiratory – helps us breathe (take in air). Circulatory – carries blood around body. Skeletal – supports body. Muscular – helps us move.
Teaching note: Choose any two from digestive, respiratory, circulatory, skeletal, muscular and give a correct function.
Correct order: mouth → gullet → stomach → small intestine → large intestine (2 marks)
Marking: 1 mark for first three correct, 1 mark for last two correct.
Teaching note: Food travels in this sequence in the digestive system.
Explanation: Root absorbs water and minerals from soil and holds plant in ground, so plant gets what it needs and stays upright. (2 marks)
Marking: 1 mark for absorb water/minerals, 1 mark for anchor/support.
Water absorber: root (1 mark); Food maker: leaf (1 mark)
Teaching note: Diagram shows root below soil (absorbs water), leaf above (makes food). Must match labels in placeholder Q15-fig1.
Function of large intestine: Absorbs water from undigested food / stores waste before it leaves body. (2 marks)
Marking: 1 for water absorption, 1 for waste storage mention.

Section C Answers

(a) Digestive system (1 mark)
(b) It breaks food into small nutrients the body can use for energy and growth. (1 mark)
Teaching note: Without it, body cannot get food energy.
(a) Any two: leaf, stem, root (1 mark total)
(b) Functions: e.g. leaf–makes food; stem–carries water/food; root–absorbs water (1 mark for correct matching)
Marking: 0.5 each if two functions correct.
(a) Gullet (1 mark)
(b) Small intestine (1 mark)
Teaching note: Use Q19-fig1 labels; gullet links mouth to stomach, small intestine is long coiled part after stomach.
(a) Any three: digestive, respiratory, circulatory, skeletal, muscular (1 mark)
(b) Muscles pull on bones to help us move / bones give support while muscles contract. (1 mark)
Teaching note: Skeletal and muscular systems work as a team for movement.

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