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Primary 3 Science Practice Paper 4
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Questions
TuitionGoWhere Practice Paper - Science Primary 3
TuitionGoWhere Practice Paper (AI)
| Subject: | Science |
| Level: | Primary 3 |
| Paper: | Practice Paper — Diversity |
| Version: | 4 of 5 |
| Duration: | 45 minutes |
| Total Marks: | 50 |
Name: _________________________________ Class: ______________ Date: ______________
Instructions
- Answer ALL questions.
- Write your answers in the spaces provided.
- For multiple choice questions, circle the correct answer.
- Read each question carefully before answering.
- Show your working clearly where required.
Section A: Multiple Choice (Questions 1–10)
Choose the correct answer and circle it. Each question carries 1 mark.
[Subtotal: 10 marks]
1. Which of the following is a living thing?
| A | A plastic bottle |
| B | A school desk |
| C | A sunflower plant |
| D | A glass marble |
Answer: _________________________________
2. Which characteristic do ALL living things share?
| A | They can fly |
| B | They need air, food and water to survive |
| C | They can speak |
| D | They are green in colour |
Answer: _________________________________
3. Look at the items below.
<image_placeholder> id: Q3-fig1 type: diagram linked_question: Q3 description: Four items arranged in a row: a toy robot with antenna, a real cat sitting, a potted bamboo plant, and a metal spoon labels: toy robot, cat, bamboo plant, metal spoon values: None must_show: All four items clearly distinguishable; toy robot should look mechanical with visible joints; cat should appear alive with natural posture; bamboo plant in pot; plain metal spoon </image_placeholder>
Which one of these can grow and reproduce?
| A | The toy robot |
| B | The cat |
| C | The metal spoon |
| D | Both the robot and the spoon |
Answer: _________________________________
4. Mould grows on a slice of bread left in the open. This shows that mould is
| A | a non-living thing |
| B | a living thing that can grow |
| C | a type of plant |
| D | a type of metal |
Answer: _________________________________
5. The diagram shows how living things are grouped.
<image_placeholder> id: Q5-fig1 type: diagram linked_question: Q5 description: Simple classification diagram with two main branches from a central box labeled "Living Things" labels: Living Things; left branch "Can make own food"; right branch "Cannot make own food"; sub-branch under left: "Plants"; sub-branches under right: "Animals", "Fungi", "Bacteria" values: None must_show: Tree-style branching diagram with clear labels; central "Living Things" box; two main branches with headings; sub-branches with all four groups named; arrows showing flow of classification </image_placeholder>
Which group is missing from the right side of the diagram?
| A | Non-living things |
| B | Water |
| C | Air |
| D | Already complete |
Answer: _________________________________
6. Which of these animals is an insect?
| A | A spider with eight legs |
| B | A butterfly with six legs and three body parts |
| C | An earthworm with no legs |
| D | A centipede with many legs |
Answer: _________________________________
7. A student wrote down: "All things that move are living things." Which example proves this statement wrong?
| A | A dog runs when called |
| B | A bird flies from tree to tree |
| C | A wind-up toy car moves when wound |
| D | A fish swims in a pond |
Answer: _________________________________
8. The table shows some organisms and their features.
| Organism | Has wings | Has feathers | Lays eggs |
|---|---|---|---|
| P | ✓ | ✓ | ✓ |
| Q | ✗ | ✗ | ✓ |
| R | ✓ | ✗ | ✓ |
Which organism is most likely a bird?
| A | P only |
| B | Q only |
| C | R only |
| D | Both P and Q |
Answer: _________________________________
9. Which group do mushrooms belong to?
| A | Plants |
| B | Animals |
| C | Fungi |
| D | Bacteria |
Answer: _________________________________
10. At East Coast Park, Hui Min observes the following: a mynah bird, a sea coconut on the sand, a plastic water bottle, and a sand crab. How many of these are living things?
| A | 1 |
| B | 2 |
| C | 3 |
| D | 4 |
Answer: _________________________________
Section B: Short Answer (Questions 11–16)
Answer in the spaces provided. Show your working and reasoning clearly.
[Subtotal: 18 marks]
11. The picture shows items found in a classroom.
<image_placeholder> id: Q11-fig1 type: diagram linked_question: Q11 description: Five items arranged on a classroom table: a goldfish in a small bowl, a wooden ruler, a potted spider plant, a metal stapler, and a packet of dried seaweed labels: goldfish, wooden ruler, spider plant, metal stapler, dried seaweed packet values: None must_show: All five items clearly distinguishable; goldfish alive in water with visible fins; wooden ruler with measurement markings; healthy potted plant with several leaves; standard metal stapler; commercial seaweed packet with visible branding style </image_placeholder>
(a) Classify the items above into living things and non-living things in the table below.
| Living things | Non-living things |
|---|---|
(b) Choose ONE living thing from your table. Give TWO characteristics that show it is living.
[3 marks]
12. Siti found these organisms near the drain behind her school.
<image_placeholder> id: Q12-fig1 type: diagram linked_question: Q12 description: Five organisms in and around a school drain environment: a mosquito larva in water, a garden snail on concrete, a fern growing from crack in wall, a patch of green algae on water surface, a discarded rubber slipper labels: mosquito larva, garden snail, fern, green algae, rubber slipper values: None must_show: Cross-section view of concrete drain with water; mosquito larva visible as small wriggling creature; snail with shell and extended body; fern with fronds emerging from wall crack; algae as green surface film; rubber slipper clearly man-made and discarded </image_placeholder>
(a) Write down the names of all the living things Siti found.
(b) Name the group (plants, animals, fungi, or bacteria) that each living thing belongs to.
Mosquito larva: _________________________________
Garden snail: _________________________________
Fern: _________________________________
Green algae: _________________________________
(c) The rubber slipper is made of a material that does not rot easily. Explain why this makes it a problem for the environment.
[4 marks]
13. Raj is studying this animal.
<image_placeholder> id: Q13-fig1 type: diagram linked_question: Q13 description: Side view of a monitor lizard (Varanus species) in typical Singapore context on grass near pavement labels: scaly skin, four legs, long tail, forked tongue, clawed feet, ear openings values: body length approximately 60 cm shown with scale indicator must_show: Distinctive monitor lizard features visible; rough scaly skin texture; four visible legs with claws; long tapering tail; forked tongue partially extended; visible ear openings behind eyes; grass and pavement background suggesting urban park setting </image_placeholder>
(a) Raj's friend thinks this animal is a snake because it has a long body and forked tongue. Give TWO features from the diagram that show it is NOT a snake.
(b) To which group of animals does this creature belong? Explain your answer using one feature from the diagram.
[3 marks]
14. The list below shows some things found in a kitchen.
| A loaf of bread with mould | A packet of instant noodles | A bowl of bean sprouts |
| A pot of chilli plant | A glass jar | A cube of yeast for baking |
(a) From the list above, write down:
(i) Two living things: _________________________, _________________________
(ii) Two non-living things: _________________________, _________________________
(b) The mould on the bread and the yeast are both classified as fungi.
(i) Give ONE way that fungi are different from plants.
(ii) Give ONE way that fungi are similar to other living things.
[4 marks]
15. Study the life cycle diagram below.
<image_placeholder> id: Q15-fig1 type: diagram linked_question: Q15 description: Complete life cycle of a butterfly showing four stages in circular arrangement with arrows labels: Egg (on leaf), Caterpillar (larva eating leaf), Pupa (chrysalis hanging from branch), Adult butterfly (emerging); arrows between stages showing progression values: Time hints: Egg (3-5 days), Caterpillar (2-4 weeks), Pupa (1-2 weeks), Adult (2-6 weeks); approximate sizes shown with scale bar must_show: Clear circular/clockwise flow; each stage visually distinct and accurately represented; leaf substrate for egg and caterpillar; branch for pupa; wings spread on adult butterfly; directional arrows between stages; brief time period labels under each stage </image_placeholder>
(a) Name the stage labelled X in this life cycle. (X is the pupa stage)
(b) Explain how this life cycle helps us know that a butterfly is a living thing.
(c) A student says: "The pupa does not move, so it must be dead." Explain why the student is wrong.
[4 marks]
16. The photograph shows a bird's nest fern growing on a tree in Singapore Botanic Gardens.
<image_placeholder> id: Q16-fig1 type: source_image linked_question: Q16 description: Bird's nest fern (Asplenium nidus) growing as epiphyte on large tree trunk in tropical garden setting labels: bird's nest fern, host tree trunk, basket-shaped rosette of fronds, shaded forest floor below values: fern diameter approximately 50-80 cm; height on trunk approximately 2 m from ground must_show: Characteristic bird's nest fern growth form with radiating green fronds forming central "nest" or cup; attachment to tree bark without visible roots in soil; surrounding tropical vegetation; dappled light through canopy; scale context with person or path marker in background if possible </image_placeholder>
(a) The bird's nest fern grows on a tree but does not get food from the tree. Explain how the fern makes its own food.
(b) Name TWO things that the fern needs from its surroundings to stay alive.
[4 marks]
Section C: Application and Investigation (Questions 17–20)
Answer in the spaces provided. These questions require you to think and explain your answers.
[Subtotal: 22 marks]
17. A group of Primary 3 students went on a learning journey to MacRitchie Reservoir. Their teacher asked them to find and record living things and non-living things.
<image_placeholder> id: Q17-fig1 type: map linked_question: Q17 description: Simple map of MacRitchie Reservoir park area with five labelled observation points A-E around reservoir edge and trail labels: Point A (near water's edge, muddy), Point B (forest trail, shaded), Point C (open grass area, sunny), Point D (tree-top walk entrance, tall trees), Point E (park bench near toilet, concrete) values: Trail distances approximately: A-B 200m, B-C 300m, C-D 400m, D-E 250m must_show: Reservoir body of water central; irregular shoreline; trail network connecting points; compass rose for orientation; simple terrain indicators (water, forest, grass, concrete areas); observation points clearly marked with letters A-E </image_placeholder>
The table shows what each student found.
| Student | Location | Things found |
|---|---|---|
| Amir | Point A | Water snails, mud, plastic bottle, water lily |
| Bernice | Point B | Ferns, rotting log, mushrooms, walking stick |
| Clara | Point C | Grass, grasshopper, butterfly, stone |
| Devi | Point D | Orangutan (not really found in MacRitchie — teacher's joke!), tree trunk, fig tree, moss |
| Ethan | Point E | Metal bench, ants, biscuit wrapper, puddle |
(a) One of the "things found" is actually a non-living thing appearing in a list of living things. Identify this error and explain your answer.
(b) Amir found a plastic bottle at Point A. Explain why we should not throw plastic bottles into the reservoir even though they are non-living.
(c) Bernice found mushrooms on a rotting log. Explain how this shows that fungi are living things.
(d) Name ONE living thing from the table that belongs to the same group as the water snails, and explain why.
[6 marks]
18. Teacher Mrs. Lim gave her class seeds to grow in different conditions. The table shows what happened after two weeks.
<image_placeholder> id: Q18-fig1 type: table linked_question: Q18 description: Data table showing seed growth experiment with four setups labels: Setup A, B, C, D; conditions: light/water/temperature; results after 2 weeks values: Setup A: Light yes, Water yes, Warm place yes → Result: Seed sprouted, 5 cm green seedling; Setup B: Light yes, Water no, Warm place yes → Result: Seed did not sprout, dry and shrivelled; Setup C: Light no, Water yes, Warm place yes → Result: Seed sprouted, 3 cm pale yellow seedling; Setup D: Light yes, Water yes, Warm place no (fridge) → Result: Seed did not sprout, unchanged must_show: Four-row table with clear column headers; all condition combinations distinct; results described specifically with measurements where sprouting occurred </image_placeholder>
(a) What conclusion can you draw about what seeds need to sprout? Use evidence from the setups to support your answer.
(b) The seedling in Setup C grew but was pale yellow instead of green. Explain why this happened and what would happen if you moved it into the light.
(c) Seeds that Mrs. Lim kept in her fridge for the experiment did not sprout. However, farmers sometimes keep seeds in cold storage for many months before planting. Explain why cold storage does not kill the seeds.
[6 marks]
19. The diagram shows four animals found in Singapore.
<image_placeholder> id: Q19-fig1 type: diagram linked_question: Q19 description: Four animals in separate labelled boxes arranged in a row: A) otter on concrete, B) reticulated python coiled, C) long-tailed macaque on branch, D) red-eared slider turtle on rock labels: A Otter, B Python, C Macaque, D Turtle values: approximate sizes: otter 70 cm body, python 3 m, macaque 40 cm body, turtle 25 cm shell length must_show: Each animal in characteristic pose; otter with smooth fur and visible legs; python with scaly skin and no legs visible; macaque with fur and grasping hands/feet on branch; turtle with shell and four legs extended; distinct physical features allowing classification </image_placeholder>
(a) Complete the classification table by placing the correct letters (A, B, C, or D) in each box. Some boxes may have more than one letter.
| Has fur or hair | Has scales | Has feathers |
|---|---|---|
| Has legs visible | No legs visible | Lays eggs |
(b) Which animal is a mammal? Give TWO reasons using features visible in the diagram.
(c) The python and the turtle are both reptiles. Explain ONE way they are similar and ONE way they are different from each other.
Similar: _________________________________________________________________
Different: _________________________________________________________________
(d) A student claims: "The macaque is most like humans because it can climb trees." Do you agree? Explain your answer.
[6 marks]
20. The class is learning about how scientists group living things. They sorted these pictures into groups.
<image_placeholder> id: Q20-fig1 type: diagram linked_question: Q20 description: Six organism cards arranged for sorting activity: rose plant with thorns, hibiscus plant with flower, crocodile in water, monitor lizard on land, salmon fish swimming, goldfish in bowl labels: Rose, Hibiscus, Crocodile, Monitor lizard, Salmon, Goldfish values: None must_show: Each organism clearly identifiable with distinctive features; rose with stem thorns and compound leaves; hibiscus with large trumpet flower; crocodile with broad snout and webbed feet visible; monitor lizard with slender snout and visible ear openings; salmon streamlined with forked tail; goldfish rounded body with flowing fins; all six in consistent card-style format with name labels </image_placeholder>
(a) The teacher first asked the class to sort the organisms into two main groups: plants and animals. Write the letters/names in the correct groups below.
| Plants | Animals |
|---|---|
(b) Next, a student tried to sort the animals into "can live in water" and "can live on land." He put the crocodile in both groups. Is he correct? Explain why.
(c) The teacher then asked: "Can we put the salmon and the goldfish in the same sub-group?" Explain your answer using features of these two animals.
(d) Suggest ONE different way to sort the six organisms (other than plants/animals or water/land). Name your sorting rule and show which organisms go in each group.
Sorting rule: _________________________________________________________________
Group 1: _________________________________________________________________
Group 2: _________________________________________________________________
[4 marks]
END OF PAPER
[Total: 50 marks]
Check your work before handing in your paper.
Answers
TuitionGoWhere Practice Paper - Science Primary 3: Answer Key
Version: 4 of 5 Topic: Diversity Total Marks: 50
Section A: Multiple Choice (Questions 1–10)
[10 marks]
1. Answer: C — A sunflower plant [1 mark]
Explanation: A sunflower plant is living because it can grow, make its own food, reproduce, and needs water and air. Plastic bottles (A), school desks (B), and glass marbles (D) are all non-living — they cannot grow, reproduce, or respond to changes in their environment.
2. Answer: B — They need air, food and water to survive [1 mark]
Explanation: All living things need air, food, and water to stay alive. This is one of the key characteristics that defines living things. Not all living things can fly (A — birds and insects can, but plants, fish, and most animals cannot). Speaking (C) is unique to humans, not all living things. Being green (D) only applies to plants with chlorophyll, not animals or fungi.
3. Answer: B — The cat [1 mark]
Explanation: The cat (B) is the only item that can grow from kitten to adult cat and can reproduce to have kittens. The toy robot (A) and metal spoon (D) are non-living — they cannot grow or reproduce. They are manufactured objects made by people. The bamboo plant can also grow and reproduce, but this option was not available as a single combined choice.
Visual check: The image shows the cat as an alive animal with natural fur and posture, distinguishing it from mechanical and manufactured items.
4. Answer: B — A living thing that can grow [1 mark]
Explanation: Mould is a type of fungus, which is a living thing. When mould appears on bread, it shows growth — one of the key characteristics of living things. Mould starts as tiny spores that are too small to see, then grows into the fuzzy patches we can observe. This proves mould is living, not non-living (A). Mould is not a plant (C) because it cannot make its own food through photosynthesis — it gets nutrients from the bread. It is definitely not a metal (D).
5. Answer: D — Already complete [1 mark]
Explanation: The diagram shows all the main groups of living things: Plants (make own food), and Animals, Fungi, and Bacteria (cannot make own food). There is no missing group on the right side. Non-living things (A) do not belong in a diagram of living things classifications. Water (B) and Air (C) are not groups of organisms.
Visual check: The diagram as described has complete branching with two main categories and four terminal groups, all correctly placed.
6. Answer: B — A butterfly with six legs and three body parts [1 mark]
Explanation: An insect has exactly six legs and three body parts (head, thorax, abdomen). A butterfly matches this description exactly. A spider (A) has eight legs — it belongs to a different group called arachnids. An earthworm (C) has no legs and a segmented body — it is an annelid, not an insect. A centipede (D) has many legs — it belongs to myriapods.
7. Answer: C — A wind-up toy car moves when wound [1 mark]
Explanation: The wind-up toy car disproves the student's statement because it moves but is definitely non-living. It cannot grow, reproduce, or respond to stimuli on its own — the movement is caused by a spring mechanism that people wind up. The dog (A), bird (B), and fish (D) all move AND are living because they also grow, reproduce, and need food and air. Movement alone is not enough to classify something as living.
8. Answer: A — P only [1 mark]
Explanation: A bird has all three features: wings, feathers, AND lays eggs. Only organism P has all three (✓ ✓ ✓). Organism Q lacks wings and feathers — this could be a reptile (like a snake or lizard) or fish. Organism R has wings and lays eggs but no feathers — this could be an insect (like a butterfly or moth) or a bat (mammal with wing-like structures but no feathers). Feathers are unique to birds and are essential for this identification.
9. Answer: C — Fungi [1 mark]
Explanation: Mushrooms belong to the fungi group. Fungi are living things that cannot make their own food (unlike plants), do not move from place to place (unlike animals), and reproduce using spores. Fungi include mushrooms, mould, and yeast. They are neither plants (A) nor animals (B), and they are much larger and more complex than bacteria (D), which are single-celled microorganisms.
10. Answer: B — 2 [1 mark]
Explanation: The living things are the mynah bird and sand crab (2 items). The mynah can fly, eat, breathe, and reproduce. The sand crab can move, grow, and reproduce in its sandy habitat. The sea coconut is non-living — it is a seed/fruit that has been separated from the parent plant and cannot grow or make food on its own at this stage (it needs to be planted). The plastic water bottle is clearly manufactured and non-living.
Section B: Short Answer (Questions 11–16)
[18 marks]
11. [Total: 3 marks]
(a) [2 marks — 1 mark for each correct column, all items must be correctly placed]
| Living things | Non-living things |
|---|---|
| Goldfish | Wooden ruler |
| Spider plant | Metal stapler |
| (Dried seaweed — accept if placed in either with valid reasoning)* |
Note: Dried seaweed is dead plant material, so it is technically non-living. However, full credit for reasoned placement in living with explanation that it came from a living thing. For marking: place in non-living for simplest correct answer.
Correct classification:
- Living: Goldfish (can swim, breathe, grow, reproduce); Spider plant (can grow, make food, reproduce)
- Non-living: Wooden ruler (made by people, cannot grow); Metal stapler (manufactured, cannot respond); Dried seaweed packet (processed, no longer alive)
(b) [1 mark — 1 mark for any living thing with TWO valid characteristics; or 0.5 mark per characteristic if partially correct]
Sample answer — Goldfish:
- It needs food and water to survive
- It can move by itself (swimming) / it can grow from small fish to bigger fish / it can reproduce to have baby fish
Sample answer — Spider plant:
- It can grow bigger and produce more leaves
- It can make its own food using sunlight / it can reproduce through runners or seeds
12. [Total: 4 marks]
(a) [1 mark — all four correct for full mark; 0.5 mark if three correct]
Mosquito larva, garden snail, fern, green algae
(b) [2 marks — 0.5 mark each]
| Organism | Group |
|---|---|
| Mosquito larva | Animals |
| Garden snail | Animals |
| Fern | Plants |
| Green algae | Plants |
Note: Green algae can be controversial — also accept "Plants/Protists" with valid reasoning. For P3 level, "Plants" is expected as they contain chlorophyll.
(c) [1 mark — 1 mark for clear explanation]
The rubber slipper does not rot/break down naturally. [0.5 mark]
This means it stays in the environment for a very long time, taking up space and possibly harming animals that might eat it or get trapped. [0.5 mark]
13. [Total: 3 marks]
(a) [2 marks — 1 mark each for any two valid features]
- It has four legs (snakes have no legs)
- It has visible ear openings (snakes do not have external ear openings)
- It has eyelids that can blink (snakes cannot blink, they have clear scale covering eyes) — may not be visible in diagram, accept only if student describes from knowledge
(b) [1 mark — 0.5 mark for correct group, 0.5 mark for linked explanation]
Reptiles [0.5 mark]
It has scaly skin / four legs / claws / lays eggs (any one feature linked to reptile characteristics) [0.5 mark]
Visual features expected: The image clearly shows four legs, claws, scaly skin texture, visible ear openings, and relatively slender snout compared to crocodile.
14. [Total: 4 marks]
(a) [2 marks — 1 mark for part (i), 1 mark for part (ii)]
(i) Two living things: Mould on bread, Bean sprouts (either order); OR Chilli plant; OR Yeast [1 mark — any two correct]
(ii) Two non-living things: Instant noodles (processed food, cannot grow), Glass jar (manufactured) [1 mark — any two correct]
Note: Mould and yeast are living; bean sprouts and chilli plant are living. Students may argue yeast in packet is dormant — accept with reasoning. Instant noodles are dead/processed plant material. Glass jar is clearly non-living.
(b) [2 marks — 1 mark each]
(i) Fungi cannot make their own food / do not have chlorophyll / do not photosynthesise (unlike plants) [1 mark]
(ii) Fungi can grow / reproduce / need water and air / respond to changes (any characteristic of living things) [1 mark]
15. [Total: 4 marks]
(a) [1 mark]
Pupa (accept: chrysalis)
(b) [1 mark — 1 mark for linking life cycle stage to living characteristic]
A butterfly goes through different stages of growth/development (egg → caterpillar → pupa → adult), which shows that it grows and changes — this is a characteristic of living things.
OR: The butterfly reproduces by laying eggs, which is a characteristic of living things.
(c) [2 marks — 1 mark for identifying that it is alive, 1 mark for explanation]
The student is wrong because the pupa is alive. [1 mark]
Inside the pupa, the caterpillar's body is breaking down and reorganising into an adult butterfly — this process needs energy and is a type of growth and development. The pupa may not move much, but it is still carrying out life processes. [1 mark] Movement alone is not proof of being alive or dead.
Visual check: The image should show pupa as intact, attached structure, not decaying, with context of continued life cycle.
16. [Total: 4 marks]
(a) [2 marks — 1 mark for mentioning chlorophyll/leaves, 1 mark for process]
The bird's nest fern has green leaves with chlorophyll. [1 mark]
It uses sunlight, water, and air (carbon dioxide) to make its own food through photosynthesis. [1 mark] It does not need to take food from the tree it grows on.
(b) [2 marks — 1 mark each for any two of: water, air/carbon dioxide, sunlight, nutrients/minerals]
- Water — for photosynthesis and transport of substances
- Sunlight — for photosynthesis to make food
- Air/Carbon dioxide — for photosynthesis
- Nutrients/Minerals — absorbed from rain and debris collected in its "nest"
Section C: Application and Investigation (Questions 17–20)
[22 marks]
17. [Total: 6 marks]
(a) [1 mark — 0.5 mark for identification, 0.5 mark for explanation]
Error: The walking stick found by Bernice is likely the insect called a stick insect / praying mantis, but a "walking stick" could also mean a wooden stick for walking, which is non-living. [0.5 mark for identifying the item]
If Bernice found an actual insect called a walking stick/stick insect, it is living. If she found a wooden walking stick, it is non-living and should not be in her living things list. [0.5 mark for explanation]
Most likely examination intent: "walking stick" as object/tool = non-living error. Accept either interpretation with valid reasoning.
(b) [1 mark — 0.5 mark for property, 0.5 mark for harm]
Plastic does not rot/decompose/break down naturally. [0.5 mark]
It remains in the water and can harm fish and other animals that might eat it or get trapped in it, polluting the reservoir. [0.5 mark]
(c) [2 marks — 1 mark for growth, 1 mark for reproduction/spores explanation]
Mushrooms grow on the rotting log over time, getting bigger and spreading. [1 mark] This shows growth, a characteristic of living things.
They also reproduce by releasing spores, which spread to grow new mushrooms nearby. [1 mark]
(d) [2 marks — 1 mark for correct organism, 1 mark for explanation]
Grasshopper / Butterfly / Ants / Water snails (any one) [1 mark]
They are all animals — they cannot make their own food, they can move from place to place, and they respond to changes in their environment. [1 mark for valid explanation with characteristic]
18. [Total: 6 marks]
(a) [2 marks — 1 mark for conclusion, 1 mark for evidence reference]
Conclusion: Seeds need water and a suitable/warm temperature to sprout. [1 mark for both factors]
Evidence:
- Setup A (water, warm) → sprouted; Setup B (no water, warm) → did not sprout, showing water is needed.
- Setup A (warm) → sprouted; Setup D (cold) → did not sprout, showing suitable temperature is needed.
- Light seems helpful but not absolutely required (Setup C sprouted in dark, though pale). [1 mark for using at least two setups as evidence correctly]
(b) [2 marks — 1 mark for explanation of pale colour, 1 mark for prediction]
The seedling in Setup C was pale yellow because it was kept in the dark and could not make chlorophyll/green pigment. [1 mark] Without light, it could not carry out photosynthesis properly.
If moved into light, it would turn green as it produces chlorophyll and starts making its own food properly. / It would continue to grow stronger and healthier. [1 mark]
(c) [2 marks — 1 mark for "dormant/not dead," 1 mark for explanation of cold storage purpose]
Cold storage does not kill seeds because the seeds are dormant/sleeping — their life processes slow down but do not stop completely. [1 mark]
Farmers keep seeds cold to preserve them and prevent them from sprouting too early, so they can plant them when conditions are right for growth (right season, with proper warmth and water). [1 mark]
19. [Total: 6 marks]
(a) [2 marks — 0.5 mark per correct cell, partial credit possible]
| Has fur or hair | Has scales | Has feathers |
|---|---|---|
| C (Macaque) | B (Python), D (Turtle) | (none — leave blank or write "none") |
| Has legs visible | No legs visible | Lays eggs |
| A (Otter), C (Macaque), D (Turtle) | B (Python) | B (Python), D (Turtle) |
Note: Otter has fur and legs; macaque has fur/hair and legs; python has scales, no legs, lays eggs; turtle has scales, legs, lays eggs.
(b) [2 marks — 1 mark for correct animal, 1 mark for two reasons with features]
The otter (A) or the macaque (C) — both are mammals [0.5 mark for either]
Reasons for otter: It has smooth fur/hair [0.5 mark] and visible legs that suggest it nurse its young with milk / has external ear flaps (mammal features, though nursing not directly visible)
Reasons for macaque: It has fur/hair covering its body [0.5 mark] and the visible body shape suggests it nurses its young with milk / has grasping hands like primates [0.5 mark]
(Accept reasonable inferences from visible features at P3 level)
(c) [2 marks — 1 mark each]
Similar: Both have scales covering their bodies / both are reptiles / both lay eggs [1 mark]
Different: The python has no visible legs and moves by slithering, while the turtle has four visible legs and can walk / The python lives mainly on land and in water as adult, turtle has shell for protection [1 mark]
(d) [2 marks — 1 mark for position, 1 mark for explanation with valid feature]
Disagree / Partially agree with correction [0.5 mark for clear position]
While macaques and humans both climb and are primates/mammals with grasping hands, climbing trees is not the most important similarity. [0.5 mark]
Better reasons: Both have forward-facing eyes for depth perception, opposable thumbs for gripping tools, large brains relative to body size, and both nurse young with milk. [1 mark for any valid feature] Many animals climb trees (squirrels, snakes) but are not closely related to humans.
20. [Total: 4 marks]
(a) [1 mark — 0.5 mark per correct column, all must be correctly placed]
| Plants | Animals |
|---|---|
| Rose, Hibiscus | Crocodile, Monitor lizard, Salmon, Goldfish |
(b) [1 mark — 0.5 mark for correct, 0.5 mark for explanation]
Yes, he is correct. [0.5 mark]
Crocodiles can live in water (swimming, hunting fish) and on land (basking in sun, nesting on riverbanks). They are amphibious reptiles that need both environments. [0.5 mark]
(c) [1 mark — 0.5 mark for yes/no with valid reason, 0.5 mark for feature]
Yes [0.5 mark]
Both salmon and goldfish are fish — they have fins, scales, gills for breathing underwater, and a streamlined body shape for swimming. They both live in water and lay eggs. [0.5 mark for feature]
OR: No [0.5 mark — accept with valid reasoning]
They are different types of fish — salmon are long, streamlined for fast ocean/river swimming with forked tails, while goldfish are round-bodied with flowing fins for slower pond/tank swimming. [0.5 mark for distinguishing feature]
(d) [1 mark — 0.5 mark for valid rule, 0.5 mark for correct grouping]
Sample answer:
Sorting rule: Has a backbone / can live in Singapore naturally vs pet/introduced [0.5 mark]
Group 1 (with backbone/vertebrates): Crocodile, Monitor lizard, Salmon, Goldfish, (Rose, Hibiscus — plants don't have backbones, so this needs care)
Better sample:
Sorting rule: Number of legs / limbs visible [0.5 mark]
Group 1 (Has legs/limbs): Rose (stems as limb-like), Hibiscus, Crocodile (four legs), Monitor lizard (four legs)
Group 2 (No legs/limbs): Salmon, Goldfish
OR:
Sorting rule: Can move from place to place by itself at adult stage [0.5 mark]
Group 1 (Can move actively): Crocodile, Monitor lizard, Salmon, Goldfish
Group 2 (Cannot move actively — fixed in place): Rose, Hibiscus
Marking Summary
| Section | Marks |
|---|---|
| A: Multiple Choice (Q1–10) | 10 |
| B: Short Answer (Q11–16) | 18 |
| C: Application (Q17–20) | 22 |
| Total | 50 |
Note to teachers/parents: This is a syllabus-aligned practice paper generated to support P3 Science learning on Diversity. It is not derived from official past-year examination papers. Questions are designed to match MOE syllabus expectations for scientific inquiry, classification skills, and application of living/non-living characteristics.