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Primary 3 Science Practice Paper 2

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TuitionGoWhere Practice Paper - Science Primary 3

TuitionGoWhere Practice Paper (AI) - Version 2

Subject: Science
Level: Primary 3
Paper: Practice Paper - Diversity
Duration: 45 minutes
Total Marks: 40

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 40.

Section A: Multiple Choice Questions (10 marks)

For each question from 1 to 10, four options are given. Choose the correct answer and write its number (1, 2, 3 or 4) in the brackets provided.

Question 1 [1]

Which of the following is a characteristic of all living things?

(1) They can move from place to place.
(2) They need air, food and water to survive.
(3) They can make their own food.
(4) They have legs to walk.

Answer: (_____)

Question 2 [1]

Study the classification table below.

Group X	Group Y
Mushroom	Butterfly
Yeast	Guppy
Mould	Cat

Which of the following headings best represents Group X and Group Y?

	Group X	Group Y
(1)	Fungi	Animals
(2)	Plants	Animals
(3)	Non-living	Living
(4)	Bacteria	Fungi

Answer: (_____)

Question 3 [1]

Four pupils made the following statements about a non-flowering plant.

Ali: It reproduces by spores.
Bala: It has flowers.
Cindy: It makes its own food.
Devi: It cannot grow.

Which pupil(s) made a correct statement?

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

Answer: (_____)

Question 4 [1]

Which of the following animals is incorrectly matched to its animal group?

(1) Frog — Amphibian
(2) Bat — Mammal
(3) Penguin — Bird
(4) Whale — Fish

Answer: (_____)

Question 5 [1]

Ravi observed an organism in his garden. It has six legs, three body parts (head, thorax, abdomen) and a pair of antennae. Which animal group does it belong to?

(1) Insects
(2) Arachnids
(3) Crustaceans
(4) Myriapods

Answer: (_____)

Question 6 [1]

The diagram below shows a bacterium viewed under a microscope.

<image_placeholder> id: Q6-fig1 type: diagram linked_question: Q6 description: A simple rod-shaped bacterium with cell wall, cell membrane, cytoplasm, and genetic material (no nucleus) labelled. labels: cell wall, cell membrane, cytoplasm, genetic material values: magnification: 1000x must_show: rod shape, no nucleus visible, simple internal structure </image_placeholder>

Which of the following statements about bacteria is true?

(1) All bacteria are harmful to humans.
(2) Bacteria are non-living things.
(3) Bacteria can only be seen with a microscope.
(4) Bacteria reproduce by laying eggs.

Answer: (_____)

Question 7 [1]

Study the flowchart below.

Start
  |
  v
Does it make its own food? --Yes--> Plant
  |
  No
  |
  v
Does it have feathers? --Yes--> Bird
  |
  No
  |
  v
Does it have hair/fur? --Yes--> Mammal
  |
  No
  |
  v
Does it have moist skin and live in water and on land? --Yes--> Amphibian
  |
  No
  |
  v
Other groups

Which animal group would a snake be classified under using this flowchart?

(1) Bird
(2) Mammal
(3) Amphibian
(4) Other groups

Answer: (_____)

Question 8 [1]

Mei Ling placed a slice of bread in a sealed plastic bag and left it on the kitchen counter. After five days, she observed greenish-black patches growing on the bread. What are these patches most likely to be?

(1) Bacteria
(2) Mould (a type of fungi)
(3) Yeast
(4) Seeds

Answer: (_____)

Question 9 [1]

Which of the following shows the correct order of classification from broadest to most specific?

(1) Animal → Mammal → Dog → Golden Retriever
(2) Dog → Animal → Mammal → Golden Retriever
(3) Golden Retriever → Dog → Mammal → Animal
(4) Mammal → Animal → Dog → Golden Retriever

Answer: (_____)

Question 10 [1]

Ahmad found an organism growing on a rotting log in the forest. It has a cap, stem, and gills underneath the cap. It does not have chlorophyll. Which group does this organism belong to?

(1) Flowering plants
(2) Non-flowering plants
(3) Fungi
(4) Bacteria

Answer: (_____)

Section B: Structured Questions (18 marks)

Answer all questions in the spaces provided.

Question 11 [3]

The table below shows four things found in a school garden.

Thing	Can it grow?	Can it move by itself?	Does it need air, food and water?	Can it reproduce?
Angsana tree	Yes	No	Yes	Yes
Garden snail	Yes	Yes	Yes	Yes
Wooden bench	No	No	No	No
Rainwater	No	No	No	No

(a) Based on the table, which two things are living things? [1]

(b) State one characteristic of living things shown by the garden snail but not by the Angsana tree. [1]

Question 12 [4]

The diagram below shows three organisms: a mushroom, a fern, and a bird's nest fern.

<image_placeholder> id: Q12-fig1 type: diagram linked_question: Q12 description: Three separate labelled diagrams side by side: (A) Mushroom with cap, stem, gills labelled; (B) Fern with fronds, roots, spores on underside of leaves labelled; (C) Bird's nest fern with rosette of fronds, central nest-like structure, spores on underside labelled. labels: A: cap, stem, gills; B: fronds, roots, spores; C: rosette of fronds, central nest, spores values: not to scale must_show: clear distinguishing features of each organism </image_placeholder>

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

(b) Which organism(s) reproduce by spores? [1]

(d) The bird's nest fern is a non-flowering plant. Explain why it is classified as a plant and not as fungi. [1]

Question 13 [3]

Classify the following animals into the correct animal groups in the table below.

Animals: Bat, Crocodile, Goldfish, Grasshopper, Penguin, Salamander

Animal Group	Animals
Amphibians
Birds
Fish
Insects
Mammals
Reptiles

Question 14 [4]

Siti conducted an investigation to find out if yeast is a living thing. She set up two flasks as shown below.

<image_placeholder> id: Q14-fig1 type: experimental_setup linked_question: Q14 description: Two flasks side by side. Flask A: Labelled "Yeast + Sugar + Warm Water", balloon attached to mouth of flask, balloon is inflated. Flask B: Labelled "Sugar + Warm Water (No Yeast)", balloon attached, balloon is not inflated. Both flasks at room temperature. labels: Flask A: Yeast + Sugar + Warm Water, inflated balloon; Flask B: Sugar + Warm Water (No Yeast), deflated balloon values: time: 30 minutes, room temperature must_show: clear difference in balloon inflation, labels on both flasks </image_placeholder>

(a) What is the purpose of Flask B in this investigation? [1]

(b) What gas is produced in Flask A that causes the balloon to inflate? [1]

(d) Siti's friend, Johan, says: "The balloon inflated because the warm water expanded the air inside the flask." Do you agree with Johan? Explain your answer. [1]

Question 15 [4]

The flowchart below shows the classification of some living things.

Living Things
    |
    +-- Plants
    |     |
    |     +-- Flowering Plants (e.g. Orchid, Mango tree)
    |     |
    |     +-- Non-flowering Plants (e.g. Fern, Moss)
    |
    +-- Animals
    |     |
    |     +-- Mammals (e.g. Whale, Bat)
    |     |
    |     +-- Birds (e.g. Eagle, Penguin)
    |     |
    |     +-- Fish (e.g. Salmon, Guppy)
    |     |
    |     +-- Amphibians (e.g. Frog, Salamander)
    |     |
    |     +-- Reptiles (e.g. Snake, Crocodile)
    |     |
    |     +-- Insects (e.g. Butterfly, Ant)
    |
    +-- Fungi (e.g. Mushroom, Mould, Yeast)
    |
    +-- Bacteria

(a) Using the flowchart, state one similarity and one difference between a bat and a penguin. [2]

Similarity: ____________________________________________________________________

Difference: ____________________________________________________________________

(b) A whale lives in water and has fins. Explain why it is classified as a mammal and not a fish. [2]

Section C: Free-Response / Application Questions (12 marks)

Answer all questions in the spaces provided.

Question 16 [4]

During a learning journey to Sungei Buloh Wetland Reserve, Primary 3 students observed the following organisms:

Mudskipper (a fish that can "walk" on land using its fins)
Mangrove tree (flowering plant)
Monitor lizard
Fiddler crab
Mushroom growing on a fallen log
Water strider (insect that walks on water surface)

(a) Classify each organism into its correct group: Plant, Animal, or Fungi. [3]

Organism	Group
Mudskipper
Mangrove tree
Monitor lizard
Fiddler crab
Mushroom
Water strider

(b) The mudskipper can breathe through its gills in water and through its skin on land. Which animal group does it belong to? Give a reason for your answer. [1]

Question 17 [4]

The diagram below shows a compost bin in a community garden.

<image_placeholder> id: Q17-fig1 type: diagram linked_question: Q17 description: Cross-section of a compost bin showing layers: bottom layer - twigs/branches, middle layer - fruit/vegetable scraps, grass clippings, top layer - soil. Arrows showing air flow from sides. Earthworms visible in middle layer. Mushrooms and mould visible on top layer. Thermometer inserted showing temperature rise. labels: twigs/branches, fruit/vegetable scraps, grass clippings, soil, air holes, earthworms, mushrooms, mould, thermometer values: temperature: 35°C (rising from room temperature) must_show: distinct layers, decomposers visible, thermometer reading </image_placeholder>

(a) Name two types of decomposers shown in the diagram. [1]

(b) Explain the role of decomposers in the compost bin. [2]

Question 18 [4]

Scientists discovered a new organism in the deep ocean. They recorded the following observations:

It is made of a single cell.
It has a cell wall but no nucleus.
It reproduces by dividing into two.
It obtains food by absorbing nutrients from its surroundings.
It can only be seen under a microscope.

(a) Based on the observations, which group of living things does this organism most likely belong to? [1]

(b) State two characteristics of living things that this organism shows. [2]

End of Paper

Total Marks: 40

Answers

TuitionGoWhere Practice Paper - Science Primary 3 (Answer Key)

Subject: Science
Level: Primary 3
Paper: Practice Paper - Diversity (Version 2)
Total Marks: 40

Section A: Multiple Choice Questions (10 marks)

Question 1 [1]

Answer: (2)
Explanation: All living things need air, food, and water to survive. This is a fundamental characteristic of life. Option (1) is incorrect because plants are living but cannot move from place to place. Option (3) is incorrect because only plants (and some bacteria) can make their own food; animals and fungi cannot. Option (4) is incorrect because many living things (e.g., snakes, worms, plants) do not have legs.

Question 2 [1]

Answer: (1)
Explanation: Group X contains mushroom, yeast, and mould — all of which are fungi. Group Y contains butterfly, guppy, and cat — all of which are animals. Option (2) is wrong because none are plants. Option (3) is wrong because all listed are living things. Option (4) is wrong because bacteria are not listed.

Question 3 [1]

Answer: (2)
Explanation: Ali is correct — non-flowering plants (e.g., ferns, mosses) reproduce by spores, not seeds. Cindy is correct — all plants (flowering and non-flowering) make their own food through photosynthesis. Bala is wrong — non-flowering plants do not have flowers. Devi is wrong — non-flowering plants can grow.

Question 4 [1]

Answer: (4)
Explanation: A whale is a mammal, not a fish. Whales breathe air using lungs, give birth to live young, feed their young with milk, and have hair (though very little). Fish breathe through gills, lay eggs (mostly), and have scales. Frog (amphibian), bat (mammal), and penguin (bird) are correctly matched.

Question 5 [1]

Answer: (1)
Explanation: Insects are defined by having six legs, three body parts (head, thorax, abdomen), and a pair of antennae. Arachnids (spiders, scorpions) have eight legs and two body parts. Crustaceans (crabs, prawns) have more than six legs and two pairs of antennae. Myriapods (centipedes, millipedes) have many legs and many body segments.

Question 6 [1]

Answer: (3)
Explanation: Bacteria are microscopic — they are too small to be seen with the naked eye and require a microscope. Option (1) is false — many bacteria are beneficial (e.g., in digestion, decomposition, food production). Option (2) is false — bacteria are living things (they grow, reproduce, respond). Option (4) is false — bacteria reproduce by binary fission (dividing into two), not by laying eggs.

Question 7 [1]

Answer: (4)
Explanation: Following the flowchart for a snake: Does it make its own food? No. Does it have feathers? No. Does it have hair/fur? No. Does it have moist skin and live in water and on land? No (snakes have dry scales and are reptiles). Therefore, it falls under Other groups (Reptiles).

Question 8 [1]

Answer: (2)
Explanation: The greenish-black patches on bread are mould, a type of fungi. Mould grows as fuzzy colonies from spores landing on food. Bacteria (1) are usually not visible as distinct patches. Yeast (3) is microscopic and grows as a sediment/sludge, not fuzzy patches. Seeds (4) would not appear spontaneously on bread in a sealed bag.

Question 9 [1]

Answer: (1)
Explanation: Classification goes from broadest (most inclusive) to most specific (least inclusive): Animal (kingdom) → Mammal (class) → Dog (genus/species group) → Golden Retriever (breed/subspecies). This is the correct hierarchical order.

Question 10 [1]

Answer: (3)
Explanation: The organism described (cap, stem, gills, no chlorophyll, growing on rotting log) is a mushroom, which belongs to Fungi. Fungi do not have chlorophyll and cannot make their own food; they are decomposers. Non-flowering plants (2) have chlorophyll and make food. Bacteria (4) are microscopic and unicellular.

Section B: Structured Questions (18 marks)

Question 11 [3]

(a) [1] Angsana tree and Garden snail
Marking: 1 mark for both correct. No half marks.

(b) [1] The garden snail can move by itself / shows movement from place to place, but the Angsana tree cannot.
Marking: Accept any valid characteristic unique to the snail: "can move by itself", "responds quickly to stimuli", "has a shell for protection" (structural). Must contrast with tree.

(c) [1] Rainwater cannot grow, cannot move by itself, does not need air/food/water, and cannot reproduce — it lacks all characteristics of living things.
Marking: 1 mark for stating at least one missing characteristic of living things. Accept: "It does not need food, air, or water" or "It cannot grow or reproduce".

Question 12 [4]

(a) [1] Mushroom
Marking: 1 mark. Only the mushroom is fungi.

(b) [1] Mushroom, Fern, and Bird's nest fern (all three)
Marking: 1 mark for all three. Fungi (mushroom) and non-flowering plants (ferns) both reproduce by spores.

(c) [1] The mushroom (fungi) is a decomposer — it obtains food by absorbing nutrients from dead/decaying matter (external digestion and absorption). The fern (plant) makes its own food through photosynthesis (has chlorophyll).
Marking: 1 mark for clear contrast: decomposer vs. food-maker / absorption vs. photosynthesis.

(d) [1] The bird's nest fern has chlorophyll and can make its own food (photosynthesis), while fungi cannot make their own food and are decomposers.
Marking: 1 mark for mentioning chlorophyll / photosynthesis / making own food as the key plant characteristic.

Question 13 [3]

Animal Group	Animals
Amphibians	Salamander
Birds	Penguin
Fish	Goldfish
Insects	Grasshopper
Mammals	Bat
Reptiles	Crocodile

Marking: 3 marks total. 0.5 marks per correct placement (6 animals × 0.5 = 3). All six must be correctly placed for full marks. Common error: Penguin → Mammal (it's a bird), Bat → Bird (it's a mammal), Salamander → Reptile (it's an amphibian).

Question 14 [4]

(a) [1] Flask B is the control set-up — it shows that without yeast, the balloon does not inflate, proving that the inflation in Flask A is due to the yeast and not the sugar, water, or warmth alone.
Marking: 1 mark for "control" + explanation that it isolates the effect of yeast.

(b) [1] Carbon dioxide (CO₂)
Marking: 1 mark. Accept "CO₂". Yeast respires anaerobically (fermentation): sugar → alcohol + CO₂.

(c) [1] Yeast shows respiration (a life process) — it releases energy from food and produces gas (CO₂), showing it is a living thing. / Yeast can reproduce (implied by population growth producing gas).
Marking: 1 mark for any valid characteristic shown: respiration, reproduction (implied), response (to sugar), growth.

(d) [1] Disagree. Flask B had the same warm water and sugar but no yeast, and its balloon did not inflate. This shows the warm water alone did not cause the inflation — the yeast caused it by producing carbon dioxide.
Marking: 1 mark for "Disagree" + correct use of control result (Flask B) as evidence.

Question 15 [4]

(a) [2]
Similarity [1]: Both are animals / both are vertebrates / both cannot make their own food / both need air, food, and water / both reproduce.
Difference [1]: A bat is a mammal (has hair/fur, gives birth to live young, feeds young with milk) while a penguin is a bird (has feathers, lays eggs, has beak, wings modified as flippers).
Marking: 1 mark each. Must be clear and accurate.

(b) [2] A whale is a mammal because: it breathes air using lungs (not gills), it gives birth to live young (does not lay eggs), it feeds its young with milk, and it has hair (at some stage of life). Fish have gills, lay eggs, and do not produce milk.
Marking: 2 marks for any two correct mammal characteristics that distinguish from fish. 1 mark for one correct characteristic. Must explain why not fish.

Section C: Free-Response / Application Questions (12 marks)

Question 16 [4]

(a) [3]

Organism	Group
Mudskipper	Animal
Mangrove tree	Plant
Monitor lizard	Animal
Fiddler crab	Animal
Mushroom	Fungi
Water strider	Animal

Marking: 3 marks total. 0.5 marks per correct classification (6 × 0.5 = 3). All correct for full marks.

(b) [1] The mudskipper belongs to Fish. Reason: It has gills for breathing in water and fins (even though modified for "walking"), which are characteristics of fish. It lives in water and on land (intertidal), but its fundamental classification is based on gills and fins.
Marking: 1 mark for "Fish" + valid reason (gills/fins). Do not accept "Amphibian" — mudskippers are fish, not amphibians (they have gills, not lungs; they have scales, not moist skin).

Question 17 [4]

(a) [1] Earthworms and mushrooms / mould (fungi)
Marking: 1 mark for any two correct decomposers shown.

(b) [2] Decomposers break down dead organic matter (fruit/vegetable scraps, grass clippings) into simpler substances / nutrients. They recycle nutrients back into the soil, making them available for plants to use.
Marking: 1 mark for "break down dead matter / waste", 1 mark for "recycle nutrients / return nutrients to soil".

(c) [1] The rising temperature indicates that the decomposers are active and respiring — respiration releases heat energy, causing the temperature to rise.
Marking: 1 mark for linking temperature rise to decomposer respiration / activity / heat release.

Question 18 [4]

(a) [1] Bacteria
Marking: 1 mark. Key clues: single-celled, cell wall but no nucleus (prokaryote), reproduces by binary fission (dividing into two), microscopic.

(b) [2] Any two of the following:

It grows (increases in size before dividing)
It reproduces (by dividing into two / binary fission)
It responds to stimuli (moves toward nutrients / away from harm)
It needs air, food (nutrients), and water (absorbs nutrients from surroundings)
It respires (releases energy from food)
Marking: 1 mark per valid characteristic (max 2). Must be from the list of 7 characteristics of living things.

(c) [1] It cannot make its own food (no chlorophyll, not a producer) — it absorbs nutrients from surroundings (heterotrophic / decomposer), while plants are autotrophs (make own food via photosynthesis). / It has no nucleus (prokaryote), while plant cells have a true nucleus (eukaryote).
Marking: 1 mark for any valid reason: no photosynthesis / heterotrophic / prokaryotic (no nucleus) vs. eukaryotic plant cells.

Marking Summary

Section	Questions	Marks
A	1–10	10
B	11–15	18
C	16–18	12
Total	18	40

Common Misconceptions Addressed

Question	Misconception	Correction
Q1	Moving = living	Plants don't move place to place but are living
Q3	Non-flowering = no reproduction	They reproduce by spores
Q4	Whale = fish (lives in water)	Whale = mammal (lungs, milk, live birth)
Q6	Bacteria = non-living / all harmful	Bacteria = living, mostly beneficial
Q7	Snake = amphibian (long body)	Snake = reptile (dry scales, lungs)
Q8	Mould = bacteria / seeds	Mould = fungi
Q10	Mushroom = plant (grows in soil)	Mushroom = fungi (no chlorophyll)
Q14	Warm air expands = balloon inflates	Control (Flask B) shows yeast produces CO₂
Q15	Penguin = mammal / Bat = bird	Penguin = bird (feathers, eggs); Bat = mammal (fur, milk)
Q16	Mudskipper = amphibian (on land)	Mudskipper = fish (gills, fins)
Q18	Single-celled = not living	Bacteria are living (show all 7 characteristics)

End of Answer Key