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Primary 4 Science Semestral Assessment 2 (End of Year) Paper 1
Free P4 Science SA2 Paper 1, Nemo3 Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.
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Questions
TuitionGoWhere Practice Paper - Science Primary 4
TuitionGoWhere Exam Practice (AI)
Subject: Science
Level: Primary 4
Paper: SA2 (Semestral Assessment 2) - Version 1
Duration: 1 hour 30 minutes
Total Marks: 60
Name: ________________________
Class: Primary 4 _______
Date: ________________________
INSTRUCTIONS TO CANDIDATES
- Do not turn over this page until you are told to do so.
- Follow all instructions carefully.
- Answer all questions.
- For Section A, shade your answers on the Optical Answer Sheet (OAS) provided.
- For Section B, write your answers in the spaces provided in this booklet.
- The number of marks is given in brackets [ ] at the end of each question or part question.
- The total marks for this paper is 60.
SECTION A: Multiple-Choice Questions (28 marks)
For each question from 1 to 14, four options are given. One of them is the correct answer. Make your choice (1, 2, 3 or 4) and shade the correct oval on the Optical Answer Sheet.
1. Which of the following groups of living things are classified correctly? [2]
| Group A | Group B | Group C |
|---|---|---|
| (1) Mushroom, Yeast, Mould | Rose plant, Hibiscus, Balsam | Parrot, Bat, Penguin |
| (2) Bacteria, Virus, Amoeba | Fern, Moss, Algae | Whale, Dolphin, Shark |
| (3) Mould, Yeast, Bacteria | Pine tree, Coconut tree, Bamboo | Frog, Toad, Salamander |
| (4) Moss, Fern, Mushroom | Hibiscus, Bougainvillea, Orchid | Guppy, Goldfish, Whale |
2. Study the classification chart below.
Generated diagram for Q2.
Based on the chart, which of the following statements is correct? [2]
(1) All flowering plants produce fruits. (2) Bacteria and fungi are non-living things. (3) A whale is classified under vertebrates. (4) Mosses are classified under flowering plants.
3. The diagram below shows a plant.
Generated diagram for Q3.
Which part, W, X, Y or Z, makes food for the plant? [2]
(1) W (2) X (3) Y (4) Z
4. Which of the following statements about the functions of plant parts is incorrect? [2]
(1) The roots absorb water and mineral salts from the soil. (2) The stem transports water and food to all parts of the plant. (3) The leaves take in carbon dioxide and give out oxygen only at night. (4) The flowers develop into fruits which protect the seeds.
5. Four pupils made the following statements about fungi and bacteria.
| Pupil | Statement |
|---|---|
| Ali | Fungi and bacteria reproduce by spores. |
| Bala | Fungi and bacteria can be seen with the naked eye. |
| Cindy | Fungi and bacteria are decomposers. |
| Devi | Fungi and bacteria need air, food and water to survive. |
Which two pupils made correct statements? [2]
(1) Ali and Bala (2) Ali and Cindy (3) Bala and Cindy (4) Cindy and Devi
6. The diagram below shows the life cycle of a mosquito.
Generated diagram for Q6.
Which of the following animals has a similar life cycle to the mosquito? [2]
(1) Butterfly (2) Grasshopper (3) Cockroach (4) Chicken
7. Study the flowchart below.
Generated diagram for Q7.
Animal X has 3 body parts and no wings. Animal Y has 8 legs. Which of the following correctly identifies Animal X and Animal Y? [2]
| Animal X | Animal Y | |
|---|---|---|
| (1) | Ant | Spider |
| (2) | Butterfly | Snail |
| (3) | Ant | Earthworm |
| (4) | Butterfly | Spider |
8. Which of the following shows the correct order of stages in the life cycle of a flowering plant? [2]
(1) Seed → Seedling → Adult plant → Flower → Fruit (2) Seed → Adult plant → Seedling → Flower → Fruit (3) Seed → Flower → Seedling → Adult plant → Fruit (4) Seed → Fruit → Flower → Seedling → Adult plant
9. The diagram below shows a human digestive system.
Generated diagram for Q9.
In which part, A, B, C, D or E, is digested food absorbed into the blood? [2]
(1) A (2) B (3) C (4) D
10. Ravi placed a magnet near a steel paper clip. The paper clip moved towards the magnet and stuck to it. Which of the following statements explains this observation? [2]
(1) The magnet exerted a frictional force on the paper clip. (2) The magnet exerted a magnetic force on the paper clip. (3) The paper clip exerted a gravitational force on the magnet. (4) The paper clip exerted an elastic spring force on the magnet.
11. Four objects A, B, C and D were tested with a magnet. The results are shown in the table below.
| Object | Observation |
|---|---|
| A | Attracted by magnet |
| B | Not attracted by magnet |
| C | Attracted by magnet |
| D | Not attracted by magnet |
Which of the following could the objects be made of? [2]
| Object A | Object B | Object C | Object D | |
|---|---|---|---|---|
| (1) | Iron | Copper | Steel | Plastic |
| (2) | Steel | Iron | Copper | Plastic |
| (3) | Copper | Plastic | Iron | Steel |
| (4) | Plastic | Steel | Copper | Iron |
12. The diagram below shows a simple circuit.
Generated diagram for Q12.
What will happen to the bulbs when the switch is closed? [2]
(1) Only B1 will light up. (2) Only B2 will light up. (3) Both B1 and B2 will light up. (4) Neither B1 nor B2 will light up.
13. Matter is anything that has mass and occupies space. Which of the following is not matter? [2]
(1) Air in a balloon (2) Water in a cup (3) Shadow of a tree (4) Ice cube in a freezer
14. The diagram below shows the water cycle.
Generated diagram for Q14.
Which process, A, B, C or D, represents condensation? [2]
(1) A (Evaporation) (2) B (Condensation) (3) C (Precipitation) (4) D (Collection)
SECTION B: Open-Ended Questions (32 marks)
Write your answers in the spaces provided.
15. The diagram below shows three living things: a mushroom, a fern, and a butterfly. [3]
Generated diagram for Q15.
(a) Classify the three living things into the groups "Plants", "Animals" and "Fungi" in the table below. [2]
| Group | Living Thing |
|---|---|
| Plants | ___________________ |
| Animals | ___________________ |
| Fungi | ___________________ |
(b) State one characteristic of fungi that is different from plants. [1]
16. The diagram below shows a plant. [3]
Image pending generation: diagram for Q16.
(a) State the function of part P. [1]
(b) The stem is cut at part Q. Explain what will happen to the leaves after a few days. [2]
17. The flowchart below shows the classification of four animals: Guppy, Frog, Butterfly, and Bat. [4]
Generated diagram for Q17.
(a) Based on the flowchart, state one similarity between the frog and the guppy. [1]
(b) Based on the flowchart, state one difference between the butterfly and the bat. [1]
(c) The bat is a mammal. State one characteristic of mammals (other than not laying eggs). [1]
(d) The guppy breathes through gills. State the function of gills. [1]
18. The diagram below shows the life cycle of a mealworm beetle. [4]
Generated diagram for Q18.
(a) Name the type of metamorphosis shown by the mealworm beetle. [1]
(b) At which stage does the mealworm beetle cause the most damage to stored grains? Explain your answer. [2]
(c) State one difference between the life cycle of a mealworm beetle and a grasshopper. [1]
19. The diagram below shows the human digestive system. [5]
Generated diagram for Q19.
(a) In which part, A, B, C, D, E or F, is water removed from undigested food? [1]
(b) Digestion is completed in part D. What happens to the digested food in part D? [1]
(c) The gullet (B) does not secrete any digestive juices. State the function of the gullet. [1]
(d) Explain why digestion does not take place in the gullet (B). [1]
(e) Name the digestive juice secreted in the mouth (A) and state its function. [1]
20. The diagram below shows a bar magnet and a compass. [4]
Generated diagram for Q20.
(a) The compass needle moves away from the North pole of the magnet. What does this show about the interaction between the two North poles? [1]
(b) The compass is now moved to the South pole of the magnet. Draw the direction of the compass needle in the diagram below. [1]
Generated diagram for Q20.
(c) Suggest one way to make the magnet stronger. [1]
(d) The magnet is cut into two pieces as shown. Label the poles of the two pieces in the diagram below. [1]
Generated diagram for Q20.
END OF PAPER
Answers
TuitionGoWhere Practice Paper - Science Primary 4 (SA2 Version 1) - Answer Key
Subject: Science
Level: Primary 4
Paper: SA2 (Semestral Assessment 2) - Version 1
Total Marks: 60
SECTION A: Multiple-Choice Questions (28 marks)
1. Answer: (3) [2]
- Reasoning: Group A (Mould, Yeast, Bacteria) are all microorganisms (Fungi and Bacteria). Group B (Pine tree, Coconut tree, Bamboo) are all non-flowering plants (Gymnosperms/Monocots - non-flowering in primary context). Group C (Frog, Toad, Salamander) are all amphibians.
- Why others are wrong: (1) Mushroom/Yeast/Mould are fungi, not plants; Bat is a mammal, not a bird. (2) Virus is non-living; Shark is a fish, not a mammal. (4) Mushroom is fungi, not a plant; Whale is a mammal, not a fish.
2. Answer: (3) [2]
- Reasoning: The chart shows "Animals" -> "Vertebrates" -> "Mammals". A whale is a mammal, hence a vertebrate.
- Why others are wrong: (1) Not all flowering plants produce fruits (some are sterile/horticultural varieties, though typically they do; but the chart doesn't show this link explicitly as a rule). (2) Bacteria and Fungi are living things (3rd branch). (4) Mosses are under "Non-flowering" plants.
3. Answer: (2) [2]
- Reasoning: Part X is the leaf. Leaves contain chlorophyll and make food for the plant through photosynthesis.
4. Answer: (3) [2]
- Reasoning: Leaves take in carbon dioxide and give out oxygen during the day (photosynthesis). At night, they typically take in oxygen and give out carbon dioxide (respiration). The statement says "only at night", which is incorrect.
5. Answer: (4) [2]
- Reasoning: Cindy is correct: Fungi and bacteria are decomposers (break down dead organisms). Devi is correct: They are living things, so they need air, food, and water. Ali is incorrect: Bacteria reproduce by binary fission, not spores (though some form endospores, primary syllabus teaches binary fission). Bala is incorrect: Bacteria are microscopic; only some fungi (mould/mushrooms) are visible.
6. Answer: (1) [2]
- Reasoning: Mosquito has a 4-stage life cycle: Egg → Larva → Pupa → Adult (Complete Metamorphosis). Butterfly has the same 4-stage cycle: Egg → Caterpillar (Larva) → Chrysalis (Pupa) → Adult.
- Why others are wrong: Grasshopper and Cockroach have 3-stage cycles (Incomplete Metamorphosis: Egg → Nymph → Adult). Chicken has a 3-stage cycle (Egg → Chick → Adult).
7. Answer: (1) [2]
- Reasoning: Animal X: 3 body parts (Yes) -> Wings (No) -> Ant. Animal Y: 3 body parts (No) -> 8 legs (Yes) -> Spider.
8. Answer: (1) [2]
- Reasoning: The life cycle of a flowering plant: Seed germinates → Seedling grows → Adult plant matures → Flowers bloom → Pollination/Fertilisation → Fruit develops (containing seeds).
9. Answer: (4) [2]
- Reasoning: Part D is the Small Intestine. Its walls have villi to absorb digested nutrients into the bloodstream.
10. Answer: (2) [2]
- Reasoning: A magnet attracts magnetic materials (like steel/iron) via magnetic force. The paper clip is made of steel (magnetic).
11. Answer: (1) [2]
- Reasoning: Objects attracted (A, C) must be magnetic materials (Iron, Steel, Nickel, Cobalt). Objects not attracted (B, D) must be non-magnetic (Copper, Plastic, Wood, Glass). Option (1): Iron (Magnetic), Copper (Non-magnetic), Steel (Magnetic), Plastic (Non-magnetic). Matches perfectly.
12. Answer: (3) [2]
- Reasoning: Closing the switch completes the circuit. It is a series circuit. Current flows through both bulbs, so both light up.
13. Answer: (3) [2]
- Reasoning: Matter has mass and occupies space. Air, water, ice have mass and volume. A shadow is an absence of light; it has no mass and does not occupy space.
14. Answer: (2) [2]
- Reasoning: Condensation is the process where water vapour loses heat and changes into liquid water droplets (clouds). Label B points to cloud formation.
SECTION B: Open-Ended Questions (32 marks)
15. [3] (a) [2]
| Group | Living Thing |
|---|---|
| Plants | Fern |
| Animals | Butterfly |
| Fungi | Mushroom |
- Marking: 1 mark for each correct row (max 2 marks). All 3 correct = 2 marks. 1-2 correct = 1 mark.
(b) [1]
- Answer: Fungi cannot make their own food / Fungi are decomposers / Fungi reproduce by spores / Fungi do not have chlorophyll / Fungi do not have roots, stems, leaves.
- Accept any one valid difference.
- Teaching Note: Plants are food producers (photosynthesis); Fungi are decomposers (external digestion and absorption).
16. [3] (a) [1]
- Answer: Part P (Roots) absorbs water and mineral salts from the soil. / Anchors the plant firmly to the ground.
- Accept either function.
(b) [2]
- Answer: The leaves will wither / dry up / die.
- Explanation: The stem (Part Q) transports water from the roots to the leaves. When the stem is cut, water cannot reach the leaves. Without water, the leaves cannot carry out photosynthesis and will lose turgidity, causing them to wither.
- Marking: 1 mark for "wither/die", 1 mark for explanation linking cut stem -> no water transport -> leaves wither.
17. [4] (a) [1]
- Answer: Both lay eggs. / Both live in water at some stage (Guppy always, Frog lays eggs in water/tadpole stage). Best answer from flowchart: Both lay eggs.
- Teaching Note: Flowchart first question: "Does it lay eggs?" -> Yes for both Guppy and Frog.
(b) [1]
- Answer: Butterfly lays eggs but Bat does not (Bat gives birth to young alive). / Butterfly has 3 body parts (insect) but Bat has fur/hair (mammal). / Butterfly has wings (chitinous) but Bat has wings (skin membrane). Best answer from flowchart: Butterfly lays eggs, Bat does not.
(c) [1]
- Answer: Mammals have hair/fur on their bodies. / Mammals feed their young with milk. / Mammals breathe with lungs. / Mammals are warm-blooded.
- Accept any one characteristic other than "do not lay eggs".
(d) [1]
- Answer: Gills allow the guppy to take in dissolved oxygen from water / breathe underwater.
18. [4] (a) [1]
- Answer: Complete metamorphosis.
- Reasoning: 4 distinct stages (Egg, Larva, Pupa, Adult). Young (larva) looks very different from adult.
(b) [2]
- Answer: Larva (Mealworm) stage.
- Explanation: The larva is the eating and growing stage. It moults several times and consumes a large amount of food (stored grains) to store energy for the pupa stage. The adult beetle eats very little or not at all.
- Marking: 1 mark for "Larva/Mealworm", 1 mark for explanation (eating/growing stage, moults, consumes most food).
(c) [1]
- Answer: Mealworm beetle has a pupa stage (4 stages) but grasshopper has no pupa stage (3 stages: Egg, Nymph, Adult). / Mealworm beetle undergoes complete metamorphosis; grasshopper undergoes incomplete metamorphosis. / Young mealworm (larva) looks very different from adult; young grasshopper (nymph) resembles a small adult without wings.
19. [5] (a) [1]
- Answer: Part E (Large Intestine).
- Reasoning: The large intestine absorbs water and mineral salts from undigested food, forming faeces.
(b) [1]
- Answer: The digested food is absorbed into the bloodstream / blood vessels (through the villi in the small intestine).
- Teaching Note: Digestion ends in small intestine; absorption happens there.
(c) [1]
- Answer: The gullet transports food from the mouth to the stomach (by peristalsis / muscular contractions).
- Teaching Note: No digestion occurs here; it is a muscular tube for transport.
(d) [1]
- Answer: Food does not stay in the gullet long enough for digestion to occur / The gullet does not secrete digestive juices / Food moves quickly to the stomach via peristalsis.
- Teaching Note: Digestion requires time and enzymes (digestive juices).
(e) [1]
- Answer: Saliva. It contains enzymes (amylase) that digests starch into simpler sugars / moistens food for swallowing.
- Marking: Must name "Saliva" and state function (digest starch OR moisten/soften food). 1 mark total.
20. [4] (a) [1]
- Answer: Like poles repel / North pole repels North pole.
- Teaching Note: Fundamental law of magnetism: Like poles repel, Unlike poles attract.
(b) [1]
- Answer: (Drawing in diagram) The compass needle's South pole (usually white/silver) points towards the magnet's South pole. The North pole (red) points away from the magnet's South pole.
- Visual Check: Needle orientation: S (compass) facing S (magnet) -> Attraction. N (compass) facing out.
- Marking: Correct pole attraction shown (Unlike poles attract).
(c) [1]
- Answer: Stroke the magnet with another strong magnet in the same direction repeatedly (Stroking method). / Place the magnet inside a solenoid carrying direct current (Electrical method). / Stack multiple magnets together with like poles aligned.
- Accept any valid method to increase magnetic strength. (Note: Heating or hammering weakens it).
(d) [1]
- Answer:
- Piece 1 (Left half): N (left end), S (right end / cut end).
- Piece 2 (Right half): N (left end / cut end), S (right end).
- Reasoning: Cutting a magnet creates two smaller magnets, each with its own North and South poles. The poles at the cut ends become opposite poles (S on left piece, N on right piece).
- Marking: Both pieces correctly labelled with N and S at correct ends. 1 mark for both correct.
TOTAL: 60 MARKS
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