From Real Exams Quiz
Primary 4 Science Systems Quiz
Free Exam-Derived Owl Alpha Primary 4 Science Systems quiz with questions and answers for Singapore students. This page is rendered as a direct URL so the questions and answers can be discovered without pressing in-page buttons.
These static practice materials are generated from the site's syllabus and paper-generation workflow, with source and model context shown so students and parents can evaluate the material before use.
Questions
Primary 4 Science Quiz - Systems
Name: ___________________________
Class: ___________________________
Date: ___________________________
Score: ______ / 40
Duration: 40 minutes
Total Marks: 40
Instructions
- Answer ALL questions.
- Write your answers in the spaces provided.
- Read each question carefully before answering.
- The number of marks for each question is shown in brackets [ ].
Section A: Multiple Choice Questions (10 marks)
Questions 1–10: Choose the most correct answer. Write the letter (A, B, C, or D) in the space provided.
1. Which part of the plant makes food for the plant?
(A) Root (B) Stem (C) Leaf (D) Flower
Answer: ___________ [1]
2. The stem of a plant does NOT
(A) hold the plant upright. (B) carry water from the roots to the leaves. (C) absorb water from the soil. (D) carry food from the leaves to other parts.
Answer: ___________ [1]
3. Which of the following is the correct function of the root?
(A) It makes food for the plant. (B) It absorbs water and minerals from the soil. (C) It transports food to the leaves. (D) It holds the flower in place.
Answer: ___________ [1]
4. In the human digestive system, food is broken down into
(A) energy. (B) nutrients. (C) oxygen. (D) carbon dioxide.
Answer: ___________ [1]
5. Which organ is where most of the food is digested and nutrients are absorbed?
(A) Mouth (B) Stomach (C) Small intestine (D) Large intestine
Answer: ___________ [1]
6. The mouth is important in the digestive system because
(A) water is absorbed there. (B) food is broken down by the teeth and mixed with saliva. (C) nutrients pass into the blood there. (D) waste is removed there.
Answer: ___________ [1]
7. A system is best described as
(A) a single object that works alone. (B) parts that work together as a whole. (C) only found in machines. (D) something that cannot be broken down.
Answer: ___________ [1]
8. Which of the following is NOT part of the human digestive system?
(A) Stomach (B) Heart (C) Small intestine (D) Large intestine
Answer: ___________ [1]
9. Water and minerals absorbed by the roots are transported to the leaves through the
(A) leaf veins. (B) flower. (C) stem. (D) soil.
Answer: ___________ [1]
10. In a plant system, the leaf, stem, and root
(A) each work on their own without helping each other. (B) only the leaf is important. (C) work together to keep the plant alive. (D) do not need each other.
Answer: ___________ [1]
Section B: Short Answer Questions (20 marks)
Questions 11–18: Write your answers in the spaces provided.
11. Match each plant part to its function. Write the correct letter in each blank. [3]
| Plant Part | Function |
|---|---|
| Leaf | ___________ |
| Stem | ___________ |
| Root | ___________ |
Functions:
- (P) Absorbs water and minerals from the soil; anchors the plant
- (Q) Makes food for the plant
- (R) Transports water and food; supports the plant
12. The diagram below shows a simple plant system. Label parts X, Y, and Z. [3]
_____
| |
| X | ← (makes food)
|_____|
|
|
| Y | ← (long tube-like structure)
|
/ \
/ \
/ Z \ ← (under the ground)
/_______\
X = ___________________________
Y = ___________________________
Z = ___________________________
13. State two functions of the human stomach in the digestive system. [2]
(i) _______________________________________________________________________________
(ii) _______________________________________________________________________________
14. Put the organs of the digestive system in the correct order, from first to last. Write the numbers 1 to 4 in the boxes. [2]
| Organ | Order |
|---|---|
| Stomach | _______ |
| Mouth | _______ |
| Large intestine | _______ |
| Small intestine | _______ |
15. Explain why the stem is important to the plant system. [2]
16. A student says: "The root only holds the plant in the soil. It does not do anything else." Do you agree? Explain your answer. [2]
17. Complete the table below to show what happens to food at each stage of the digestive system. [3]
| Organ | What happens to food here |
|---|---|
| Mouth | _________________________________________________________ |
| Stomach | _________________________________________________________ |
| Small intestine | _________________________________________________________ |
18. Give one reason why we can say that a plant is a "system." [1]
Section C: Structured / Application Questions (10 marks)
Questions 19–20: Answer in complete sentences where required.
19. The diagram shows a human digestive system with parts labelled A, B, C, and D.
┌───┐ ┌───┐ ┌─────────────┐ ┌──────────┐
│ A │────▶│ B │────▶│ C │────▶│ D │
└───┘ └───┘ └─────────────┘ └──────────┘
(tube) (sac-like) (long coiled tube) (wider tube)
(a) Name parts B and C. [2]
B = ___________________________
C = ___________________________
(b) In which part (A, B, C, or D) are nutrients absorbed into the blood? [1]
Answer: ___________
(c) What happens to the undigested food that enters part D? [1]
20. Priya set up an experiment with two similar potted plants.
- Plant 1: All leaves were removed.
- Plant 2: All leaves were left intact.
Both plants were placed in a sunny spot and given the same amount of water every day. After two weeks, Plant 1 looked weak and droopy, while Plant 2 was healthy and green.
(a) Why did Plant 1 look weak and droopy? [2]
(b) What does this experiment tell us about the importance of leaves in the plant system? [2]
(c) If Priya had removed the roots instead of the leaves, predict what would happen to the plant. Give a reason. [1]
Answers
Primary 4 Science Quiz - Systems
Answer Key
Total Marks: 40
Section A: Multiple Choice Questions (10 marks)
1. C [1]
- The leaf makes food for the plant through photosynthesis.
- Common mistake: Students may choose B (stem) because the stem "carries" things, but making food is the leaf's role.
2. C [1]
- The stem holds the plant upright, transports water and food, but does NOT absorb water from the soil — that is the root's function.
3. B [1]
- The root absorbs water and minerals from the soil and anchors the plant.
- Common mistake: Choosing A (making food) — that is the leaf's function.
4. B [1]
- In the digestive system, food is broken down into nutrients that the body can absorb and use.
5. C [1]
- The small intestine is where most digestion and nutrient absorption occurs.
- Common mistake: Choosing B (stomach) — the stomach breaks down food but does not absorb most nutrients.
6. B [1]
- In the mouth, teeth break down food into smaller pieces and saliva begins the chemical breakdown of food.
7. B [1]
- A system is made up of parts that work together as a whole.
8. B [1]
- The heart is part of the circulatory system, not the digestive system.
9. C [1]
- Water and minerals absorbed by the roots are transported upward through the stem to the leaves.
10. C [1]
- The leaf, stem, and root each have their own function, but they all work together to keep the plant alive.
Section B: Short Answer Questions (20 marks)
11. [3 — 1 mark each]
- Leaf → Q (Makes food for the plant)
- Stem → R (Transports water and food; supports the plant)
- Root → P (Absorbs water and minerals from the soil; anchors the plant)
12. [3 — 1 mark each]
- X = Leaf
- Y = Stem
- Z = Root
13. [2 — 1 mark each]
- (i) The stomach churns and mixes the food with digestive juices.
- (ii) The stomach breaks down food into a semi-liquid form (partially digests food).
- Accept any two valid functions: churning, mixing with acid/juices, breaking down food, partial digestion.
14. [2 — ½ mark each]
- Mouth → 1
- Stomach → 2
- Small intestine → 3
- Large intestine → 4
15. [2]
- The stem is important because it transports water and minerals from the roots to the leaves [1], and it also transports food made in the leaves to other parts of the plant [1]. Additionally, it supports/holds the plant upright.
- Award 1 mark for transport function, 1 mark for support or second transport function.
16. [2]
- I do not agree [1]. The root not only anchors/holds the plant in the soil, but it also absorbs water and minerals from the soil for the plant to use [1].
- Award 1 mark for disagreeing, 1 mark for stating the additional function (absorption of water/minerals).
17. [3 — 1 mark each]
- Mouth: Food is chewed/broken into smaller pieces by the teeth and mixed with saliva.
- Stomach: Food is churned and mixed with digestive juices/acid to break it down further.
- Small intestine: Nutrients from the digested food are absorbed into the blood.
18. [1]
- A plant is a system because it is made up of different parts (leaf, stem, root) that work together to keep the plant alive.
- Accept any valid explanation showing parts working together.
Section C: Structured / Application Questions (10 marks)
19. (a) [2 — 1 mark each]
- B = Stomach
- C = Small intestine
(b) [1]
- C (Small intestine)
(c) [1]
- Undigested food in the large intestine (D) has water removed from it, and the remaining waste is stored before being removed from the body.
- Accept: Water is absorbed/removed; waste is passed out of the body.
20. (a) [2]
- Plant 1 had no leaves, so it could not make food [1]. Without food, the plant became weak and droopy [1].
- Award 1 mark for stating no food could be made, 1 mark for consequence (weak/droopy/no energy).
(b) [2]
- This experiment shows that leaves are essential because they make food for the plant [1]. Without leaves, the plant cannot make food and will not survive well [1].
- Award 1 mark for identifying the leaf's role (making food), 1 mark for explaining the consequence of removing leaves.
(c) [1]
- The plant would die or become very weak because without roots, the plant cannot absorb water and minerals from the soil [1].
- Accept any reasonable prediction with a valid reason related to the root's function.