From Real Exams Exam Paper
Primary 3 Science Semestral Assessment 2 (End of Year) Paper 5
Free Exam-Derived NVIDIA Nemotron 3 Ultra 550B A55B Free Primary 3 Science Semestral Assessment 2 (End of Year) Paper 5 practice paper 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
TuitionGoWhere Practice Paper - Science Primary 3
TuitionGoWhere Exam Practice (AI)
Subject: Science
Level: Primary 3
Paper: SA2 (Version 5)
Duration: 1 hour 15 minutes
Total Marks: 60
Name: ________________________
Class: Primary 3 _______
Date: _______________
Instructions to Candidates
- Do not open this booklet 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 and Section C, 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. Choose the correct answer and shade the corresponding oval (1, 2, 3, or 4) on the Optical Answer Sheet. Each question carries 2 marks.
Question 1
Which of the following groups contains only living things?
- Mushroom, yeast, mould
- Robot, toy car, doll
- Cloud, rain, wind
- Rock, sand, water
Question 2
Study the classification table below.
| Group X | Group Y |
|---|---|
| Rose plant | Mushroom |
| Hibiscus plant | Yeast |
| Bougainvillea plant | Bread mould |
What is the most suitable heading for Group X and Group Y?
| Group X | Group Y | |
|---|---|---|
| 1 | Flowering plants | Fungi |
| 2 | Non-flowering plants | Bacteria |
| 3 | Plants | Animals |
| 4 | Living things | Non-living things |
Question 3
Which of the following is not a characteristic of living things?
- Living things need air, food, and water to survive.
- Living things can grow and reproduce.
- Living things can move from place to place on their own.
- Living things respond to changes around them.
Question 4
Four objects are classified as shown below.
<image_placeholder> id: Q4-fig1 type: table linked_question: Q4 description: Classification table with two columns labeled Group A and Group B. Group A contains: Goldfish, Guppy, Angelfish. Group B contains: Dolphin, Whale, Seal. labels: Group A, Group B values: Goldfish, Guppy, Angelfish, Dolphin, Whale, Seal must_show: Clear separation of fish in Group A and mammals in Group B </image_placeholder>
Which of the following statements is correct?
- Animals in Group A lay eggs but animals in Group B give birth to young alive.
- Animals in Group A have scales but animals in Group B have hair.
- Animals in Group A breathe through gills but animals in Group B breathe through lungs.
- All of the above.
Question 5
Which of the following animals is an insect?
- Spider
- Butterfly
- Centipede
- Earthworm
Question 6
Study the flowchart below.
<image_placeholder> id: Q6-fig1 type: diagram linked_question: Q6 description: Flowchart for classifying animals. Start box: "Does it have feathers?" Yes arrow leads to "Bird". No arrow leads to "Does it have hair/fur?" Yes arrow leads to "Mammal". No arrow leads to "Does it have moist skin?" Yes arrow leads to "Amphibian". No arrow leads to "Does it have scales?" Yes arrow leads to "Reptile/Fish". No arrow leads to "Insect". labels: Feathers, Hair/Fur, Moist Skin, Scales, Bird, Mammal, Amphibian, Reptile/Fish, Insect values: None must_show: Clear decision diamonds and rectangular outcome boxes with arrows labeled Yes/No </image_placeholder>
Animal X has dry scales, lays eggs, and breathes through lungs. Which group does Animal X belong to?
- Amphibian
- Bird
- Reptile
- Fish
Question 7
Which of the following statements about fungi is correct?
- Fungi make their own food.
- Fungi reproduce by seeds.
- Fungi can be seen only under a microscope.
- Fungi reproduce by spores.
Question 8
Study the table below.
| Organism | Makes its own food | Reproduces by spores | Needs air, food, water |
|---|---|---|---|
| P | Yes | No | Yes |
| Q | No | Yes | Yes |
| R | No | No | No |
Which of the following correctly identifies P, Q, and R?
| P | Q | R | |
|---|---|---|---|
| 1 | Plant | Fungus | Non-living thing |
| 2 | Fungus | Plant | Non-living thing |
| 3 | Plant | Non-living thing | Fungus |
| 4 | Non-living thing | Plant | Fungus |
Question 9
A student observed a living thing. It has six legs, three body parts, and a pair of antennae. It lays eggs. What is this living thing most likely to be?
- A spider
- A beetle
- A centipede
- A snail
Question 10
Which of the following shows the correct classification of plants?
| Flowering Plants | Non-flowering Plants | |
|---|---|---|
| 1 | Rose, Hibiscus, Fern | Moss, Mushroom, Algae |
| 2 | Mango tree, Bougainvillea, Orchid | Fern, Moss, Algae |
| 3 | Grass, Balsam, Mould | Conifer, Fern, Yeast |
| 4 | Sunflower, Morning glory, Bacteria | Mushroom, Moss, Fern |
Question 11
Study the diagram below.
<image_placeholder> id: Q11-fig1 type: diagram linked_question: Q11 description: Diagram showing a plant with roots, stem, leaves, flowers, and fruits. Labels pointing to each part. labels: Roots, Stem, Leaves, Flowers, Fruits values: None must_show: Clear labels on a typical flowering plant structure </image_placeholder>
Which part of the plant helps it to reproduce?
- Roots
- Stem
- Leaves
- Flowers
Question 12
Four children made the following statements about bacteria.
- Ali: Bacteria are non-living things because they are too small to be seen.
- Bala: Bacteria are living things because they can reproduce.
- Cindy: Bacteria are fungi because they reproduce by spores.
- Devi: Bacteria are plants because they can be found in soil.
Who made the correct statement?
- Ali
- Bala
- Cindy
- Devi
Question 13
Which of the following groups of animals are all mammals?
- Bat, whale, penguin
- Dolphin, bat, kangaroo
- Seal, platypus, crocodile
- Kangaroo, dolphin, shark
Question 14
The diagram below shows a mushroom growing on a rotting log.
<image_placeholder> id: Q14-fig1 type: diagram linked_question: Q14 description: Diagram of a mushroom growing on a decaying log. Labels: Cap, Gills (under cap), Stem, Rotting log. labels: Cap, Gills, Stem, Rotting log values: None must_show: Mushroom structure with gills visible under cap, growing on decaying wood </image_placeholder>
What is the function of the gills found under the cap of the mushroom?
- To absorb water from the log
- To produce spores for reproduction
- To make food for the mushroom
- To support the mushroom upright
Section B: Structured Questions (22 marks)
Write your answers in the spaces provided. The number of marks is given in brackets [ ] at the end of each question or part question.
Question 15
The table below shows some characteristics of four things, A, B, C, and D. A tick (✓) shows that the thing has the characteristic.
| Characteristic | A | B | C | D |
|---|---|---|---|---|
| Needs air, food, and water | ✓ | ✓ | ✓ | ✗ |
| Can grow | ✓ | ✓ | ✓ | ✗ |
| Can reproduce | ✓ | ✓ | ✗ | ✗ |
| Can respond to changes | ✓ | ✓ | ✓ | ✗ |
| Can move on its own | ✓ | ✗ | ✗ | ✗ |
(a) Based on the table, which thing(s) is/are definitely living? Explain your answer. [2]
(b) Thing C cannot reproduce but has the other characteristics of living things. Give a possible reason why it cannot reproduce. [1]
(c) Thing D does not need air, food, or water. It cannot grow, reproduce, respond to changes, or move on its own. What is Thing D likely to be? [1]
Question 16
Study the classification chart below.
<image_placeholder> id: Q16-fig1 type: diagram linked_question: Q16 description: Classification chart. Top level: Living Things. Two branches: Plants and Animals. Plants branch to Flowering Plants and Non-flowering Plants. Animals branch to six groups: Mammals, Birds, Fish, Reptiles, Amphibians, Insects. labels: Living Things, Plants, Animals, Flowering Plants, Non-flowering Plants, Mammals, Birds, Fish, Reptiles, Amphibians, Insects values: None must_show: Clear hierarchical tree structure with all labels </image_placeholder>
(a) State two differences between flowering plants and non-flowering plants. [2]
Difference 1: ___________________________________________________________________
Difference 2: ___________________________________________________________________
(b) A student saw a plant with cones but no flowers. Which group does this plant belong to? [1]
(c) The student also saw a small green plant growing on a damp brick wall. It has no flowers, no cones, and no true roots. Which group does this plant most likely belong to? [1]
Question 17
The diagram below shows three animals: a frog, a lizard, and a salamander.
<image_placeholder> id: Q17-fig1 type: diagram linked_question: Q17 description: Three animal diagrams side by side. Left: Frog with smooth moist skin, webbed feet. Middle: Lizard with dry scaly skin, four legs with claws. Right: Salamander with smooth moist skin, long tail, four legs without claws. labels: Frog, Lizard, Salamander values: None must_show: Distinct skin textures (moist vs scaly), presence/absence of claws, tail visibility </image_placeholder>
(a) Which two of these animals are amphibians? [1]
(b) State one similarity and one difference between the frog and the salamander. [2]
Similarity: _____________________________________________________________________
Difference: _____________________________________________________________________
(c) The lizard is a reptile. State two characteristics of reptiles that the lizard shows. [2]
Characteristic 1: ________________________________________________________________
Characteristic 2: ________________________________________________________________
Question 18
Study the flowchart below.
<image_placeholder> id: Q18-fig1 type: diagram linked_question: Q18 description: Flowchart for classifying living things. Start: "Is it a living thing?" No -> Non-living thing. Yes -> "Does it make its own food?" Yes -> Plant. No -> "Is it a fungus?" Yes -> Fungus. No -> "Is it a bacterium?" Yes -> Bacterium. No -> Animal. labels: Living thing, Non-living thing, Make own food, Plant, Fungus, Bacterium, Animal values: None must_show: Clear decision diamonds and outcome boxes with Yes/No arrows </image_placeholder>
(a) Using the flowchart, classify the following organisms. Write "Plant", "Fungus", "Bacterium", "Animal", or "Non-living thing" in the blanks. [3]
(i) Mushroom: _______________________
(ii) Rose plant: _______________________
(iii) Yeast: _______________________
(iv) Cat: _______________________
(v) Virus (considered non-living by some scientists): _______________________
(vi) Metal toy car: _______________________
(b) Bacteria are different from fungi. State one difference. [1]
Question 19
A group of students went on a nature walk and recorded the animals they saw in the table below.
| Animal | Body Covering | Breathing Method | Reproduction |
|---|---|---|---|
| P | Feathers | Lungs | Lays eggs |
| Q | Scales | Gills | Lays eggs |
| R | Hair | Lungs | Gives birth to young alive |
| S | Moist skin | Lungs and skin | Lays eggs in water |
(a) Identify the animal group (Mammal, Bird, Fish, Reptile, Amphibian) for each animal. [4]
P: _______________________
Q: _______________________
R: _______________________
S: _______________________
(b) Animal R feeds its young with milk. What is this characteristic called? [1]
(c) Animal S lives both in water and on land at different stages of its life. Name the process where the young of Animal S changes form as it grows. [1]
Section C: Open-Ended Questions (10 marks)
Write your answers in the spaces provided. The number of marks is given in brackets [ ] at the end of each question or part question.
Question 20
The diagram below shows a terrarium set up by a student. It contains soil, a small fern, some moss, and a few mealworms. The terrarium is sealed with a lid that has small air holes.
<image_placeholder> id: Q20-fig1 type: experimental_setup linked_question: Q20 description: Terrarium diagram: Glass container with lid (small air holes). Inside: Layer of soil at bottom. Fern plant with fronds. Moss patches on soil. 3-4 mealworms on soil/plant. Water droplets visible on inner walls. labels: Glass container, Lid with air holes, Soil, Fern, Moss, Mealworms, Water droplets values: None must_show: Sealed environment with air holes, living organisms (fern, moss, mealworms), water cycle evidence (droplets) </image_placeholder>
(a) The student observed water droplets forming on the inner walls of the terrarium after a few hours. Explain how the water droplets were formed. [2]
(b) The mealworms are the only animals in the terrarium. They feed on the moss and fern. Classify the mealworm, moss, and fern as "Producer" or "Consumer". [2]
Mealworm: _______________________
Moss: _______________________
Fern: _______________________
(c) The student added a few bacteria and fungi to the soil in the terrarium. State the role of bacteria and fungi in the terrarium. [1]
(d) The terrarium is a self-sustaining system. Explain why the air holes on the lid are necessary even though the terrarium is sealed. [2]
(e) After two weeks, the student noticed that the mealworms had turned into beetles. What does this show about the characteristics of living things? [1]
End of Paper
Answers
TuitionGoWhere Practice Paper - Science Primary 3 (SA2 Version 5) - Answer Key
Subject: Science
Level: Primary 3
Paper: SA2 (Version 5)
Total Marks: 60
Section A: Multiple-Choice Questions (28 marks)
Question 1
Answer: 1
Explanation: Mushroom, yeast, and mould are all fungi, which are living things. They grow, reproduce (by spores), and need air, food, and water. Robots, toys, clouds, rain, wind, rocks, sand, and water are non-living things.
Question 2
Answer: 1
Explanation: Group X contains rose, hibiscus, and bougainvillea — all are flowering plants. Group Y contains mushroom, yeast, and bread mould — all are fungi. Option 1 correctly matches these headings.
Question 3
Answer: 3
Explanation: Not all living things can move from place to place on their own. Plants are living things but are generally rooted and cannot move from place to place (though they can move parts like leaves towards light). The other three statements are correct characteristics of all living things.
Question 4
Answer: 4
Explanation: Group A contains fish (goldfish, guppy, angelfish) and Group B contains marine mammals (dolphin, whale, seal). All three statements are correct: (1) Fish lay eggs; mammals give birth to live young. (2) Fish have scales; mammals have hair (even whales have some hair at birth). (3) Fish breathe through gills; mammals breathe through lungs.
Question 5
Answer: 2
Explanation: Butterfly is an insect (6 legs, 3 body parts, pair of antennae, wings). Spider is an arachnid (8 legs, 2 body parts). Centipede is a myriapod (many legs, many body segments). Earthworm is an annelid (segmented body, no legs).
Question 6
Answer: 3
Explanation: Following the flowchart: Animal X has dry scales (not feathers, not hair/fur, not moist skin) → "Does it have scales?" Yes → Reptile/Fish. Since it breathes through lungs (not gills), it is a reptile. Reptiles have dry scales, lay eggs, and breathe through lungs.
Question 7
Answer: 4
Explanation: Fungi reproduce by spores (not seeds). They cannot make their own food (they are decomposers, absorbing nutrients from dead/decaying matter). Some fungi like mushrooms are visible to the naked eye; only microscopic fungi like yeast need a microscope.
Question 8
Answer: 1
Explanation: P makes its own food → Plant. Q does not make food but reproduces by spores and needs air/food/water → Fungus. R lacks all characteristics of living things → Non-living thing.
Question 9
Answer: 2
Explanation: Six legs, three body parts (head, thorax, abdomen), pair of antennae, and lays eggs are defining characteristics of insects. Beetles are insects. Spiders have 8 legs and 2 body parts. Centipedes have many legs and many body segments. Snails are molluscs with a muscular foot and shell.
Question 10
Answer: 2
Explanation: Mango tree, bougainvillea, and orchid are flowering plants. Fern, moss, and algae are non-flowering plants. Option 1 incorrectly puts fern under flowering and mushroom under non-flowering (mushroom is fungus). Option 3 puts mould (fungus) and yeast (fungus) under plants. Option 4 puts bacteria (not plant) and mushroom (fungus) incorrectly.
Question 11
Answer: 4
Explanation: Flowers are the reproductive parts of flowering plants. They produce seeds and fruits after pollination and fertilisation. Roots absorb water/minerals, stem transports substances and supports, leaves make food.
Question 12
Answer: 2
Explanation: Bala is correct. Bacteria are living things — they reproduce (by binary fission), need air/food/water, grow, and respond to changes. They are not fungi (no spores, different cell structure), not plants (no chlorophyll, cannot make food), and their small size does not make them non-living.
Question 13
Answer: 2
Explanation: Dolphin, bat, and kangaroo are all mammals (have hair/fur, breathe through lungs, give birth to live young, feed young with milk). Penguin is a bird. Crocodile is a reptile. Shark is a fish.
Question 14
Answer: 2
Explanation: The gills under the mushroom cap produce spores for reproduction. They do not absorb water (the mycelium in the log does), make food (fungi are decomposers), or support the mushroom (the stem does).
Section B: Structured Questions (22 marks)
Question 15
(a) [2 marks]
Answer: Things A and B are definitely living things.
Explanation: Living things must show ALL characteristics: need air/food/water, grow, reproduce, respond to changes. A and B have ticks for all five characteristics. Thing C cannot reproduce (so not definitely living — could be a sterile organism or young organism). Thing D has no characteristics of living things.
Marking notes: 1 mark for identifying A and B; 1 mark for correct explanation referencing all characteristics.
(b) [1 mark]
Answer: Thing C could be a young organism that has not reached reproductive maturity, or a sterile organism (e.g., a mule, or a plant grown from cutting that hasn't flowered yet).
Explanation: Some living things cannot reproduce at certain life stages (too young) or due to biological reasons (sterility), but they are still living.
Marking notes: Accept any reasonable explanation related to life stage or sterility.
(c) [1 mark]
Answer: Non-living thing (e.g., a rock, toy, water, air).
Explanation: Thing D lacks all characteristics of living things.
Question 16
(a) [2 marks]
Answer:
Difference 1: Flowering plants produce flowers and fruits; non-flowering plants do not produce flowers or fruits.
Difference 2: Flowering plants reproduce by seeds (inside fruits); non-flowering plants reproduce by spores (e.g., ferns, mosses) or cones (e.g., conifers).
Marking notes: 1 mark per valid difference. Accept: "Flowering plants have seeds enclosed in fruits; non-flowering plants have naked seeds (cones) or spores."
(b) [1 mark]
Answer: Non-flowering plant (specifically, a conifer / gymnosperm).
Explanation: Conifers (like pine trees) produce cones instead of flowers.
(c) [1 mark]
Answer: Non-flowering plant (specifically, a moss / bryophyte).
Explanation: Mosses are small, non-flowering, have no true roots (have rhizoids), grow in damp places, and reproduce by spores.
Question 17
(a) [1 mark]
Answer: Frog and salamander.
Explanation: Both have smooth, moist skin, lay eggs in water, and undergo metamorphosis. Lizard has dry scaly skin and claws — it is a reptile.
(b) [2 marks]
Answer:
Similarity: Both have smooth, moist skin / both are amphibians / both lay eggs in water / both undergo metamorphosis.
Difference: Frog has no tail (as adult) and has webbed feet for swimming; salamander has a long tail and no webbed feet (or less webbing).
Marking notes: 1 mark for valid similarity, 1 mark for valid difference.
(c) [2 marks]
Answer:
Characteristic 1: Dry, scaly skin.
Characteristic 2: Breathes through lungs only / lays eggs with leathery shells on land / has claws on toes.
Marking notes: 1 mark per valid reptile characteristic shown by lizard in diagram.
Question 18
(a) [3 marks]
Answer:
(i) Mushroom: Fungus
(ii) Rose plant: Plant
(iii) Yeast: Fungus
(iv) Cat: Animal
(v) Virus: Non-living thing (or Bacterium — but viruses are generally considered non-living as they cannot reproduce independently)
(vi) Metal toy car: Non-living thing
Marking notes: 0.5 marks each. For (v), accept "Non-living thing" with explanation, or "Bacterium" if student follows flowchart strictly (but scientifically, viruses are non-living).
(b) [1 mark]
Answer: Bacteria are single-celled (unicellular) microorganisms without a nucleus; fungi can be unicellular (yeast) or multicellular (mould, mushroom) and have a nucleus. OR Bacteria reproduce by binary fission; fungi reproduce by spores. OR Bacteria are prokaryotes; fungi are eukaryotes.
Marking notes: Accept any one clear structural or reproductive difference.
Question 19
(a) [4 marks]
Answer:
P: Bird (feathers, lungs, lays eggs)
Q: Fish (scales, gills, lays eggs)
R: Mammal (hair, lungs, gives birth to live young)
S: Amphibian (moist skin, lungs and skin, lays eggs in water)
Marking notes: 1 mark each.
(b) [1 mark]
Answer: Mammary glands / milk production / lactation.
Explanation: Mammals feed their young with milk produced by mammary glands.
(c) [1 mark]
Answer: Metamorphosis.
Explanation: Amphibians like frogs and salamanders undergo metamorphosis — the young (tadpole/larva) looks very different from the adult and changes form as it grows.
Section C: Open-Ended Questions (10 marks)
Question 20
(a) [2 marks]
Answer: Water from the soil is absorbed by the plants (fern and moss) through their roots. The plants release water vapour through their leaves by transpiration. The water vapour rises, cools upon contact with the cooler inner walls of the glass container, and condenses into water droplets.
Marking notes: 1 mark for transpiration/evaporation from plants/soil; 1 mark for condensation on cooler walls.
(b) [2 marks]
Answer:
Mealworm: Consumer
Moss: Producer
Fern: Producer
Explanation: Producers (plants) make their own food by photosynthesis. Consumers (animals) eat other organisms for food. Mealworms eat moss and fern, so they are consumers. Moss and fern are plants that photosynthesise, so they are producers.
Marking notes: 1 mark for all three correct; 0.5 marks for 1-2 correct.
(c) [1 mark]
Answer: Bacteria and fungi are decomposers. They break down dead organisms and waste matter (like mealworm droppings, dead leaves) into simpler substances, returning nutrients to the soil for plants to use.
Marking notes: Must mention "decomposers" and "break down dead matter/waste" and "return nutrients".
(d) [2 marks]
Answer: The air holes allow exchange of gases between the terrarium and the outside environment. Living things (plants, mealworms, bacteria, fungi) need oxygen for respiration continuously. While plants produce oxygen during photosynthesis (in light), they also respire all the time (day and night), consuming oxygen and releasing carbon dioxide. The air holes ensure a continuous supply of oxygen and prevent buildup of excess carbon dioxide.
Marking notes: 1 mark for gas exchange / oxygen for respiration; 1 mark for explaining why plants alone cannot sustain it (respire at night, or balance needed).
(e) [1 mark]
Answer: It shows that living things grow and reproduce / undergo life cycle changes.
Explanation: The mealworm (larva) grew and transformed into a beetle (adult), demonstrating growth and development — key characteristics of living things.
Marking notes: Accept "living things grow" or "living things reproduce" or "living things have life cycles".
Total Marks: 60
End of Answer Key