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Primary 4 Science Systems Quiz

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

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Primary 4 Science From Real Exams Generated by Ox Alpha Updated 2026-08-27

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Questions

Primary 4 Science Quiz - Systems

Name: ______________________ Class: ____________ Date: ______________

Subject: Science | Level: Primary 4 | Topic: Systems (Plant System & Human Digestive System) Duration: 50 minutes | Total Marks: 45 | Score: ________ / 45

Instructions:

Answer ALL 20 questions in the spaces provided.
Section A: circle or underline ONE option (A–D) for each question.
The marks for each question are shown in brackets [ ].
Check your work before handing in your paper.

Section A: Multiple Choice (Questions 1–5) — 5 marks

Question 1.

Which part of the plant absorbs water and mineral salts from the soil?

A. Leaf B. Flower C. Root D. Stem

[1]

Question 2.

After food leaves the gullet, which organ does it enter next?

A. Mouth B. Stomach C. Small intestine D. Large intestine

[1]

Question 3.

In which organ is most of the digested food absorbed into the body?

A. Mouth B. Gullet C. Stomach D. Small intestine

[1]

Question 4.

Which body system gives our body its shape and protects organs such as the brain?

A. Digestive system B. Skeletal system C. Respiratory system D. Circulatory system

[1]

Question 5.

The stem of a plant mainly helps the plant to ______________.

A. absorb mineral salts from the soil B. make food for the plant C. hold the plant upright and carry water to the leaves D. take in carbon dioxide from the air

[1]

Section B: Short Answer (Questions 6–10) — 15 marks

Question 6.

Complete the table by writing ONE main function of each plant part.

Plant part	One main function
Leaf	(i) ________________________________________
Stem	(ii) _______________________________________
Root	(iii) ______________________________________

[3]

Question 7.

Study the diagram of the human digestive system. Write the name of each part labelled A, B, C and D.

Image pending generation: diagram for Q7.

Part A: ______________________ Part B: ______________________

Part C: ______________________ Part D: ______________________

[4]

Question 8.

Match each body system to its correct function. Write the correct letter (A–D) in each box.

System	Letter
1. Digestive system	______
2. Respiratory system	______
3. Circulatory system	______
4. Muscular system	______

Functions:

A. Takes in oxygen and removes carbon dioxide from the body
B. Works with the bones to move the body
C. Breaks down food into simpler substances
D. Carries digested food, water and oxygen around the body

[4]

Question 9.

Write T for True or F for False beside each statement.

(i) All the parts of a plant work together as a system to keep the plant alive. ______
(ii) The flower makes food for the plant. ______

[2]

Question 10.

Fill in each blank with a suitable word.

Digested food is absorbed into the blood through the walls of the ____________ intestine. The remaining undigested food then passes into the ____________ intestine, where most of the water is absorbed.

[2]

Section C: Structured Questions (Questions 11–20) — 25 marks

Question 11.

Study the flowering plant below. Write the name of each part labelled W, X, Y and Z.

Image pending generation: diagram for Q11.

Part W: ______________________ Part X: ______________________

Part Y: ______________________ Part Z: ______________________

[4]

Question 12.

Give ONE reason why the small intestine needs to be very long.

[2]

Question 13.

The flow chart shows the path of food through the digestive system.

Mouth → A → Stomach → B → Large Intestine

(i) Name part A: ______________________
(ii) Name part B: ______________________
(iii) State ONE thing that happens to food in the stomach.

[3]

Question 14.

Give TWO ways in which the roots help a plant.

[2]

Question 15.

Mei Ling put a stalk of celery with leaves into a jar of red-coloured water. After one day, she saw red streaks inside the stem and the leaves had turned slightly red.

(i) What does this experiment show about the function of the stem?
(ii) Which plant part took in the coloured water at first?

[3]

Question 16.

(i) In which organ of the digestive system is water absorbed from the undigested food? ______________________
(ii) In which organ is the waste (faeces) stored before it leaves the body? ______________________

[2]

Question 17.

Sort the following parts into the correct system in the table.

Parts: leaf, mouth, root, stomach, stem, small intestine, flower, gullet

Plant system	Human digestive system

[3]

Question 18.

Digestion breaks food down into smaller pieces before the body can use it. Give TWO reasons why chewing food well in the mouth helps digestion.

[2]

Question 19.

(i) Name the body system that works together with the digestive system to carry digested food to all parts of the body. ______________________
(ii) Name the liquid in the mouth that starts the digestion of starchy food. ______________________

[2]

Question 20.

Zoe says, "The stomach is the last stop for food in the digestive system."

Is Zoe correct? Explain your answer by giving the correct order of organs that food passes through after the mouth.

[2]

END OF PAPER

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Answers

Primary 4 Science Quiz - Systems — Answer Key

Total Marks: 45

Answer 1.

C. Root

Answer 2.

B. Stomach

Answer 3.

D. Small intestine

Answer 4.

B. Skeletal system

Answer 5.

C. Hold the plant upright and carry water to the leaves

Answer 6.

(i) Leaf: makes food for the plant (photosynthesis)
(ii) Stem: holds the plant upright and carries water and mineral salts between the roots and the leaves
(iii) Root: absorbs water and mineral salts from the soil and holds the plant firmly in the ground

Answer 7.

Part A: Gullet (food pipe / oesophagus)
Part B: Stomach
Part C: Small intestine
Part D: Large intestine

Answer 8.

1. Digestive system → C
1. Respiratory system → A
1. Circulatory system → D
1. Muscular system → B

Answer 9.

(i) T
(ii) F — the leaf makes food for the plant; the flower makes fruits and seeds

Answer 10.

First blank: small; Second blank: large

Answer 11.

Part W: Flower
Part X: Leaf
Part Y: Stem
Part Z: Root

Answer 12.

Any one of:

It gives a long surface area so there is more time and space to digest food and absorb digested food into the blood.
More digested food can be absorbed along its length.

Answer 13.

(i) A: Gullet (oesophagus)
(ii) B: Small intestine
(iii) Any one of: the stomach churns the food; the stomach mixes food with digestive juices; food is partly broken down into a thick liquid.

Answer 14.

Any two of:

They absorb water and mineral salts from the soil.
They hold the plant firmly in the ground.
Their branching shape lets them reach more water in the soil.

Answer 15.

(i) The stem carries water (and dissolved substances) from the roots up to the leaves and other parts of the plant.
(ii) The roots (root hairs).

Answer 16.

(i) Large intestine
(ii) Rectum

Answer 17.

Plant system: leaf, root, stem, flower
Human digestive system: mouth, stomach, small intestine, gullet

Answer 18.

Any two of:

Chewing cuts food into smaller pieces that are easier to swallow.
Smaller pieces have a bigger surface area, so digestive juices can break the food down faster and more completely.

Answer 19.

(i) Circulatory system
(ii) Saliva

Answer 20.

No, Zoe is not correct. After the mouth, food passes through the gullet, then the stomach, then the small intestine, and finally the large intestine. The stomach is only the third stop; most digested food is absorbed in the small intestine.