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Primary 3 Science Practice Paper 3

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TuitionGoWhere Practice Paper - Science Primary 3

TuitionGoWhere Practice Paper (AI)
Subject: Science
Level: Primary 3
Paper: Practice Paper 3 (Version 3 of 5)
Duration: 1 hour 15 minutes
Total Marks: 50

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.
The number of marks is given in brackets [ ] at the end of each question or part question.
The total marks for this paper is 50.
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.

Section A: Multiple-Choice Questions (20 marks)

For each question from 1 to 10, 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 is a non-living thing? [2]

(1) Mushroom
(2) Bacteria
(3) Plastic ruler
(4) Yeast

2. Study the classification table below.

Group A	Group B
Rose plant	Goldfish
Mango tree	Parrot
Fern	Frog

Which of the following headings best represents Group A and Group B? [2]

(1) Group A: Flowering plants | Group B: Animals
(2) Group A: Plants | Group B: Animals
(3) Group A: Non-flowering plants | Group B: Animals
(4) Group A: Plants | Group B: Non-flowering plants

3. Ahmad found an organism in his garden. He observed that it:

Does not make its own food
Reproduces by spores
Grows on dead matter

Which group does this organism most likely belong to? [2]

(1) Bacteria
(2) Fungi
(3) Plants
(4) Animals

4. Four pupils made the following statements about living things.

Pupil	Statement
Ali	All living things can move from place to place.
Bala	All living things need air, water and food.
Cindy	All living things reproduce by laying eggs.
Devi	All living things have legs.

Which pupil made a correct statement? [2]

(1) Ali
(2) Bala
(3) Cindy
(4) Devi

5. The diagram below shows a young plant and an adult plant of the same species.

<image_placeholder> id: Q5-fig1 type: diagram linked_question: Q5 description: Two diagrams side by side showing a young plant (small, few leaves) and an adult plant (taller, more leaves, flowers) of the same species. Both are labelled with arrows pointing to roots, stem, leaves. labels: Young plant, Adult plant, roots, stem, leaves, flowers (on adult only) values: Height of young plant: 5 cm, Height of adult plant: 30 cm must_show: Clear size difference, same plant parts, flowers only on adult plant </image_placeholder>

Which characteristic of living things is best shown by the diagrams? [2]

(1) Living things can reproduce.
(2) Living things can grow.
(3) Living things can respond to changes.
(4) Living things need air, water and food.

6. Which of the following groups contains only flowering plants? [2]

(1) Moss, fern, bird's nest fern
(2) Hibiscus, bougainvillea, orchid
(3) Mushroom, yeast, mould
(4) Algae, seaweed, moss

7. Study the flowchart below.

<image_placeholder> id: Q7-fig1 type: diagram linked_question: Q7 description: Flowchart for classifying animals. Start: Does it have feathers? Yes -> Bird. No -> Does it have hair/fur? Yes -> Mammal. No -> Does it have scales and live in water? Yes -> Fish. No -> Does it have moist skin and live on land and water? Yes -> Amphibian. No -> Does it have 6 legs and 3 body parts? Yes -> Insect. No -> Reptile. labels: Decision diamonds with questions, rectangular boxes with animal groups values: None must_show: Clear branching logic, all 6 animal groups represented </image_placeholder>

An animal has dry scales, breathes with lungs, and lays eggs with leathery shells. Which group does it belong to? [2]

(1) Amphibian
(2) Bird
(3) Fish
(4) Reptile

8. The table below shows the characteristics of four organisms, W, X, Y and Z. A tick (✓) shows the organism has the characteristic.

Characteristic	W	X	Y	Z
Makes its own food	✓	✓
Reproduces by spores			✓
Has hair/fur				✓
Lives in water		✓

Which organism is most likely a mammal? [2]

(1) W
(2) X
(3) Y
(4) Z

9. Mei Ling placed a potted plant in a dark cupboard for one week. She observed that the plant grew towards the small gap at the bottom of the cupboard door. [2]

Which characteristic of living things does this show?

(1) Living things can grow.
(2) Living things can reproduce.
(3) Living things respond to changes.
(4) Living things need air, water and food.

10. Which of the following statements about bacteria is correct? [2]

(1) Bacteria are non-living things because they are too small to be seen.
(2) Bacteria are living things because they can reproduce.
(3) Bacteria are plants because they can make their own food.
(4) Bacteria are fungi because they reproduce by spores.

Section B: Structured Questions (20 marks)

Answer all questions in the spaces provided.

11. The diagram below shows four things found in a classroom.

<image_placeholder> id: Q11-fig1 type: diagram linked_question: Q11 description: Four separate pictures labelled A, B, C, D. A: A wooden desk. B: A potted money plant. C: A plastic water bottle. D: A hamster in a cage. labels: A: Wooden desk, B: Potted money plant, C: Plastic water bottle, D: Hamster in cage values: None must_show: Clear distinction between living and non-living objects </image_placeholder>

(a) Classify the four things into living and non-living things by writing the letters (A, B, C, D) in the correct boxes below. [2]

Living Things	Non-Living Things

(b) For the hamster (D), state two characteristics of living things that it shows. [2]

12. Study the classification chart below.

<image_placeholder> id: Q12-fig1 type: diagram linked_question: Q12 description: Classification chart with three main branches from "Living Things": Plants, Animals, Fungi. Under Plants: Flowering (examples: durian tree, hibiscus) and Non-flowering (examples: bird's nest fern, moss). Under Animals: 6 groups (Mammals, Birds, Fish, Amphibians, Reptiles, Insects). Under Fungi: Mould, Mushroom, Yeast. Bacteria shown as separate from the three main branches. labels: All group names and examples as described values: None must_show: Complete hierarchy with examples </image_placeholder>

(a) Based on the chart, state one similarity and one difference between flowering plants and non-flowering plants. [2]

Similarity: __________________________________________________________________

Difference: _________________________________________________________________

(b) Mushrooms and yeast are both fungi. State one similarity and one difference between them. [2]

Similarity: __________________________________________________________________

Difference: _________________________________________________________________

(c) Bacteria are not classified under Plants, Animals or Fungi. Give one reason why bacteria are considered living things. [1]

13. Ravi observed three organisms, P, Q and R, in his school garden. He recorded his observations in the table below.

Observation	Organism P	Organism Q	Organism R
Makes its own food	Yes	No	Yes
Reproduces by seeds	Yes	No	No
Reproduces by spores	No	Yes	Yes
Can move from place to place	No	No	No

(a) Which organism(s) is/are plant(s)? [1]

(b) Which organism is most likely a fungus? [1]

14. The diagram below shows the life cycle of a butterfly.

<image_placeholder> id: Q14-fig1 type: diagram linked_question: Q14 description: Circular life cycle diagram with 4 stages: Egg -> Larva (caterpillar) -> Pupa (chrysalis) -> Adult butterfly -> back to Egg. Arrows show direction. Each stage labelled. labels: Egg, Larva (caterpillar), Pupa (chrysalis), Adult butterfly values: None must_show: Clear 4-stage cycle with correct order and labels </image_placeholder>

(a) Name the stage marked X in the diagram. [1]

(b) At which stage does the butterfly reproduce? [1]

(d) The caterpillar eats a lot of leaves. Why is this important for its development? [1]

15. Siti wants to find out whether mould grows faster on white bread or wholemeal bread. She sets up the experiment as shown.

<image_placeholder> id: Q15-fig1 type: experimental_setup linked_question: Q15 description: Two setups side by side. Setup A: Slice of white bread in a sealed transparent bag, labelled "White bread". Setup B: Slice of wholemeal bread in a sealed transparent bag, labelled "Wholemeal bread". Both placed on a table near a window. A ruler and magnifying glass nearby for measurement. labels: Setup A: White bread, Setup B: Wholemeal bread, sealed bags, ruler, magnifying glass values: Bread slice size: 10 cm x 10 cm x 1 cm each must_show: Two identical setups differing only in bread type, measurement tools visible </image_placeholder>

(a) State the changed variable (independent variable) in this experiment. [1]

(b) State the measured variable (dependent variable) in this experiment. [1]

(d) After 5 days, Siti observes green patches on both bread slices. What conclusion can she draw? [1]

Section C: Free-Response Questions (10 marks)

Answer all questions in the spaces provided.

16. The diagram below shows a mangrove tree growing at Sungei Buloh Wetland Reserve.

<image_placeholder> id: Q16-fig1 type: diagram linked_question: Q16 description: A mangrove tree with distinctive prop roots sticking out of muddy water. Labels pointing to: prop roots, trunk, leaves, flowers, muddy water, small crabs on roots. labels: Prop roots, Trunk, Leaves, Flowers, Muddy water, Crabs values: None must_show: Clear mangrove features: prop roots, flowers (indicating flowering plant), habitat </image_placeholder>

(a) The mangrove tree is a flowering plant. How can you tell from the diagram? [1]

(b) The prop roots grow above the muddy water. State one function of these prop roots. [1]

(c) The crabs living on the prop roots are animals. State two characteristics of animals that the crabs show. [2]

17. Study the table below. It shows the characteristics of four organisms found in Singapore.

Organism	Makes own food	Body covering	Reproduction	Habitat
A: Malayan Flying Lemur	No	Fur	Gives birth to live young	Trees in forests
B: Paradise Tree Snake	No	Scales	Lays eggs	Trees in forests
C: Singapore Freshwater Crab	No	Hard shell	Lays eggs	Streams in forests
D: Bird's Nest Fern	Yes	Fronds (leaves)	Spores	On tree branches

(a) Which organism is a mammal? Give one reason for your answer. [2]

(b) Which organism is a reptile? Give one reason for your answer. [2]

18. Jun Hao found a strange object in the park. He wants to determine if it is a living thing or a non-living thing.

(a) List three questions Jun Hao can ask himself to help him decide. [3]

Question 1: _________________________________________________________________

Question 2: _________________________________________________________________

Question 3: _________________________________________________________________

(b) Jun Hao observes that the object grows bigger over two weeks. He concludes it is a living thing. Is his conclusion necessarily correct? Explain your answer. [2]

END OF PAPER

Answers

TuitionGoWhere Practice Paper - Science Primary 3 (Answer Key)

Subject: Science
Level: Primary 3
Paper: Practice Paper 3 (Version 3 of 5)
Total Marks: 50

Section A: Multiple-Choice Questions (20 marks)

1. Answer: (3) Plastic ruler [2]

Explanation:

Living things need air, water, and food; they grow, reproduce, and respond to changes.
Mushroom, bacteria, and yeast are all living things (fungi and bacteria).
A plastic ruler is man-made, does not grow, reproduce, or need food/water/air → non-living.

2. Answer: (2) Group A: Plants | Group B: Animals [2]

Explanation:

Group A contains rose plant (flowering), mango tree (flowering), fern (non-flowering) → all are plants.
Group B contains goldfish (fish), parrot (bird), frog (amphibian) → all are animals.
Option (1) is wrong because fern is non-flowering. Option (3) is wrong because rose and mango are flowering. Option (4) is wrong because Group B are animals, not plants.

3. Answer: (2) Fungi [2]

Explanation:

Fungi (mould, mushroom, yeast) do not make their own food (no chlorophyll), reproduce by spores, and grow on dead/decaying matter.
Bacteria reproduce by binary fission, not spores. Plants make their own food. Animals move and eat other organisms.

4. Answer: (2) Bala [2]

Explanation:

Ali: False – plants are living but cannot move from place to place.
Bala: True – all living things need air, water, and food to survive.
Cindy: False – only some animals lay eggs; plants reproduce by seeds/spores, bacteria by binary fission.
Devi: False – many living things (plants, snakes, worms, bacteria) have no legs.

5. Answer: (2) Living things can grow. [2]

Explanation:

The diagrams show the same species at two stages: young (5 cm) and adult (30 cm) with more leaves and flowers.
This demonstrates growth – increase in size and complexity.
Reproduction would show offspring. Response to changes would show reaction to stimuli. Needing air/water/food is not visible in a static diagram.

6. Answer: (2) Hibiscus, bougainvillea, orchid [2]

Explanation:

All three are flowering plants (produce flowers and seeds).
(1) Moss, fern, bird's nest fern are non-flowering plants.
(3) Mushroom, yeast, mould are fungi.
(4) Algae, seaweed, moss are non-flowering plants/algae.

7. Answer: (4) Reptile [2]

Explanation:

Follow the flowchart:
- Feathers? No → Not a bird.
- Hair/fur? No → Not a mammal.
- Scales and live in water? Has scales but lives on land (implied by lungs and leathery eggs) → Not a fish.
- Moist skin and live on land and water? Dry scales → Not an amphibian.
- 6 legs and 3 body parts? No → Not an insect.
- Therefore: Reptile (dry scales, lungs, leathery eggs).

8. Answer: (4) Z [2]

Explanation:

Mammals have hair/fur. Only organism Z has hair/fur (✓).
W and X make their own food → plants.
Y reproduces by spores → likely fungus.
Z has hair/fur, does not make own food → mammal.

9. Answer: (3) Living things respond to changes. [2]

Explanation:

The plant detected light (change in environment) from the door gap and grew towards it.
This is phototropism – a response to light stimulus.
Growth (1) is increase in size, not direction. Reproduction (2) is producing offspring. Needing air/water/food (4) is a requirement, not shown by this observation.

10. Answer: (2) Bacteria are living things because they can reproduce. [2]

Explanation:

Bacteria are microscopic but show characteristics of life: they reproduce (binary fission), grow, respond to environment, need nutrients.
(1) Size does not determine living/non-living.
(3) Most bacteria cannot make their own food (some photosynthetic bacteria exist, but not a defining trait).
(4) Bacteria reproduce by binary fission, not spores (some form endospores for survival, not reproduction).

Section B: Structured Questions (20 marks)

11. (a) [2]

Living Things	Non-Living Things
B, D	A, C

B (Potted money plant) – plant, grows, makes food.
D (Hamster) – animal, moves, breathes, reproduces.
A (Wooden desk) – made from dead wood, no life processes.
C (Plastic water bottle) – man-made, no life processes.

Marking: 1 mark for correct living things (B, D), 1 mark for correct non-living things (A, C). No half marks.

11. (b) [2]

Any two of the following (1 mark each):

The hamster can move by itself from place to place.
The hamster needs air, water, and food to survive.
The hamster can grow (increase in size).
The hamster can reproduce (give birth to young).
The hamster responds to changes (e.g., runs away when scared).

12. (a) [2]

Similarity: Both are plants / both can make their own food (photosynthesis) / both have roots, stems, and leaves. (Any one, 1 mark)

Difference: Flowering plants reproduce by seeds (produce flowers and fruits), while non-flowering plants reproduce by spores (do not produce flowers or fruits). (1 mark)

12. (b) [2]

Similarity: Both are fungi / both reproduce by spores / both cannot make their own food (decomposers). (Any one, 1 mark)

Difference: Mushrooms are macroscopic (can be seen with naked eye, have a cap and stem), while yeast is microscopic (single-celled, cannot be seen individually without a microscope). (1 mark)
Accept: Mushrooms are multicellular, yeast is unicellular.

12. (c) [1]

Bacteria can reproduce (by binary fission) / grow / respond to changes / need nutrients. (Any one characteristic of living things, 1 mark)

13. (a) [1]

Organism P (Makes own food + reproduces by seeds = flowering plant)

13. (b) [1]

Organism Q (Does not make own food + reproduces by spores = fungus)

13. (c) [2]

Organism Q does not make its own food (no chlorophyll, cannot photosynthesise) and reproduces by spores, which are characteristics of fungi. (1 mark for "does not make own food", 1 mark for "reproduces by spores")

Common mistake: Saying "it is a mushroom" – mushroom is one type of fungus, but the observations fit fungi in general.

14. (a) [1]

Larva (caterpillar) – the stage between egg and pupa.

14. (b) [1]

Adult butterfly – only the adult stage can reproduce (lay eggs).

14. (c) [1]

Any one difference:

Larva (caterpillar) has no wings; adult butterfly has wings.
Larva crawls; adult butterfly flies.
Larva eats leaves; adult butterfly sips nectar.
Larva is worm-like; adult has 6 legs and 3 body parts.

14. (d) [1]

The caterpillar eats a lot to gain energy and nutrients for growth and to store energy for the pupa stage (when it does not eat) and for metamorphosis into an adult.

15. (a) [1]

Type of bread (white bread vs wholemeal bread).

15. (b) [1]

Amount/rate of mould growth (e.g., size of mould patches, number of days until mould appears).

15. (c) [2]

Any two of the following (1 mark each):

Size of bread slices (same dimensions).
Moisture content / dampness of bread.
Temperature / location where bags are placed.
Type of bag / sealing method (same air exposure).
Amount of light exposure.
Initial cleanliness (same handling).

15. (d) [1]

Mould can grow on both white bread and wholemeal bread (or: type of bread does not prevent mould growth).
Accept: Mould grows on both types of bread after 5 days.

Section C: Free-Response Questions (10 marks)

16. (a) [1]

The diagram shows flowers on the mangrove tree. Flowering plants produce flowers (which develop into fruits and seeds).

16. (b) [1]

Any one function:

Support the tree in soft, muddy soil.
Absorb air/oxygen for the roots (since muddy water has little air).
Anchor the tree firmly against tides and waves.

16. (c) [2]

Any two characteristics of animals (1 mark each):

Crabs can move from place to place (walk/swim).
Crabs cannot make their own food (they hunt/scavenge).
Crabs reproduce (lay eggs).
Crabs respond to changes (hide when threatened).
Crabs need air, water, and food.
Crabs grow (moult their shells to grow bigger).

17. (a) [2]

Organism A: Malayan Flying Lemur (1 mark)
Reason: It has fur/hair and gives birth to live young (characteristics of mammals). (1 mark)

17. (b) [2]

Organism B: Paradise Tree Snake (1 mark)
Reason: It has scales and lays eggs (characteristics of reptiles). (1 mark)

17. (c) [2]

Organism D (Bird's Nest Fern) is a plant because it makes its own food (photosynthesis, has chlorophyll in fronds).
Fungi cannot make their own food (they are decomposers that absorb nutrients from dead matter). (1 mark for "makes own food", 1 mark for contrast with fungi)

18. (a) [3]

Any three valid questions based on characteristics of living things (1 mark each):

Does it need air, water, and food?
Can it grow (increase in size/cells)?
Can it reproduce (make more of its kind)?
Can it move by itself?
Does it respond to changes in its surroundings?
Does it breathe/respire?

Questions must be testable/observable. "Is it alive?" is not acceptable.

18. (b) [2]

No, his conclusion is not necessarily correct. (1 mark)
Explanation: Non-living things can also appear to grow bigger due to external factors, e.g., a balloon inflates (air pumped in), crystals grow (minerals deposit), sponge expands (absorbs water), or puddles enlarge (rain adds water). True growth in living things involves cell division and internal metabolic processes, not just increase in size from external addition. (1 mark)

Key concept: Growth in living things is internal (cellular); increase in size of non-living things is external accumulation.

Marking Summary

Section	Questions	Total Marks
A (MCQ)	1–10	20
B (Structured)	11–15	20
C (Free-Response)	16–18	10
Total	18 questions	50

Note: Questions 11–18 have sub-parts; top-level question count is 18, consistent with paper structure.

End of Answer Key