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Primary 4 Science Systems Quiz
Free P4 Science Systems quiz, LongCat Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.
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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.