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Primary 6 PSLE Science Diversity Quiz

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Primary 6 PSLE Science From Real Exams Generated by LongCat 2.0 LLM Updated 2026-08-17

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Questions

Primary 6 PSLE Science Quiz - Diversity

Name: ___________________________ Class: ___________________________ Date: ___________________________ Score: _________ / 40 marks

Duration: 45 minutes

Instructions:

Answer ALL questions.
Write your answers in the spaces provided.
Marks for each question are shown in brackets [ ].
You may use a calculator where appropriate.
Read each question carefully before answering.

Section A: Multiple Choice Questions (Questions 1–10)

Each question carries 1 mark. Choose the most suitable answer (A, B, C, or D).

1. Which of the following is a characteristic used to classify living things into groups?

A) Colour of the organism B) Number of body parts C) Presence of a backbone D) Size of the organism

Answer: _______________

[1 mark]

2. The table below shows four organisms and their characteristics.

Organism	Has feathers	Has lungs	Lays eggs
P	✓	✓	✓
Q	✗	✓	✗
R	✓	✓	✗
S	✗	✗	✓

Which organism is most likely a bird?

A) P B) Q C) R D) S

Answer: _______________

[1 mark]

3. Which of the following is NOT a characteristic of mammals?

A) Have hair or fur B) Breathe through lungs C) Lay eggs with hard shells D) Produce milk for their young

Answer: _______________

[1 mark]

4. A student grouped the following organisms: fern, moss, mushroom, rose plant. Which characteristic did the student most likely use to group them?

A) They all produce flowers. B) They all have roots and stems. C) They all reproduce by spores. D) They are all living things that do not produce seeds (except rose plant — this is a trick; the student grouped non-flowering organisms).

Answer: _______________

[1 mark]

5. Which of the following is a vertebrate?

A) Earthworm B) Grasshopper C) Jellyfish D) Frog

Answer: _______________

[1 mark]

6. The diagram below shows a classification key.

Image pending generation for this question.

Living Thing
├── Has backbone → Go to Step 2
└── No backbone → Go to Step 3

Step 2:
├── Has feathers → Bird
└── No feathers → Go to Step 4

Step 3:
├── Has legs → Insect
└── No legs → Worm

Step 4:
├── Lives in water → Fish
└── Lives on land → Mammal

Using the key above, which organism would be classified as a "Bird"?

A) A shark B) A bat C) A parrot D) A lizard

Answer: _______________

[1 mark]

7. Which of the following pairs shows organisms from the SAME group?

A) Spider and crab B) Frog and toad C) Fern and rose D) Mushroom and bacteria

Answer: _______________

[1 mark]

8. What is the main reason scientists classify living things?

A) To give every organism a unique name B) To study the diversity of life in an organised way C) To count the number of organisms on Earth D) To decide which organisms are useful to humans

Answer: _______________

[1 mark]

9. An organism has the following characteristics: dry scaly skin, lays eggs with leathery shells, and is cold-blooded. Which group does it belong to?

A) Amphibians B) Reptiles C) Fish D) Mammals

Answer: _______________

[1 mark]

10. Which of the following is a flowering plant?

A) Fern B) Pine tree C) Grass D) Moss

Answer: _______________

[1 mark]

Section B: Short Answer Questions (Questions 11–15)

Answer each question in the space provided. Write clearly and use scientific terms where appropriate.

11. The table below shows the characteristics of four organisms (W, X, Y, and Z).

Characteristic	W	X	Y	Z
Has feathers	✓	✗	✗	✗
Has fur/hair	✗	✓	✗	✗
Has dry scaly skin	✗	✗	✓	✗
Has moist skin	✗	✗	✗	✓
Lays eggs	✓	✗	✓	✓
Produces milk	✗	✓	✗	✗

(a) Identify the group to which organism W belongs. [1 mark]

(b) Give ONE reason for your answer in (a). [1 mark]

[3 marks]

12. Study the classification key below and answer the questions that follow.

Step 1:
├── Has leaves with branching veins → Go to Step 2
└── Has leaves with parallel veins → Plant Q

Step 2:
├── Produces seeds in cones → Plant R
└── Produces seeds in fruits → Plant S

(a) Plant T has leaves with branching veins and produces seeds in fruits. Identify Plant T using the key. [1 mark]

(b) State ONE characteristic that Plant Q and Plant R have in common. [1 mark]

[2 marks]

13. The diagram below shows four organisms: a butterfly, a spider, a crab, and an earthworm.

Image pending generation for this question.

(a) Which of the above organisms are arthropods? [1 mark]

(b) Give ONE characteristic that all arthropods share. [1 mark]

[3 marks]

14. A student found an organism near a pond. It has the following characteristics:

Smooth, moist skin
Four legs
Lays eggs in water
Breathes through lungs and skin

(a) Classify this organism into its correct group. [1 mark]

(b) Explain how this organism's skin helps it to survive in its environment. [1 mark]

[2 marks]

15. The table below compares two groups of plants.

Feature	Group X	Group Y
Produces flowers	Yes	No
Seeds enclosed in fruit	Yes	No
Reproduction method	Seeds in fruits	Spores or cones

(a) Name Group X and Group Y. [2 marks]

Group X: _______________________________________________

Group Y: _______________________________________________

(b) Give ONE example of a plant from Group Y. [1 mark]

[3 marks]

Section C: Structured / Application Questions (Questions 16–20)

Answer all questions. Show your reasoning clearly. Use complete sentences where required.

16. The diagram below shows a simple classification key with some labels missing.

Image pending generation for this question.

Living Organism
├── Has a backbone → VERTEBRATE
│   ├── Has feathers → (i) ___________
│   ├── Has dry scaly skin → Reptile
│   ├── Has fur/hair → (ii) ___________
│   └── Has moist skin → (iii) ___________
└── No backbone → INVERTEBRATE
    ├── Has jointed legs → (iv) ___________
    └── No jointed legs → (v) ___________

Complete the key by filling in labels (i) to (v). [5 marks]

(i) _______________________________________________

(ii) _______________________________________________

(iii) _______________________________________________

(iv) _______________________________________________

(v) _______________________________________________

[5 marks]

17. The table below shows the characteristics of five vertebrate animals (A, B, C, D, and E).

Characteristic	A	B	C	D	E
Warm-blooded	✓	✓	✗	✗	✗
Cold-blooded	✗	✗	✓	✓	✓
Has feathers	✓	✗	✗	✗	✗
Has fur/hair	✗	✓	✗	✗	✗
Has scales	✗	✗	✓	✓	✗
Has moist skin	✗	✗	✗	✗	✓
Lays eggs	✓	✗	✓	✓	✓
Produces milk	✗	✓	✗	✗	✓
Breathes through gills (at some stage)	✗	✗	✓	✗	✓

(a) Identify the group for each animal A to E. [5 marks]

A: _______________________________________________

B: _______________________________________________

C: _______________________________________________

D: _______________________________________________

E: _______________________________________________

(b) Animal D lives on land and breathes only through lungs. Name ONE possible animal that fits the description of Animal D. [1 mark]

[6 marks]

18. A nature walk was conducted in a garden. The students recorded the following organisms:

Ant, grasshopper, snail, earthworm, butterfly, spider, millipede, caterpillar

(a) Classify the organisms into two groups: those WITH jointed legs and those WITHOUT jointed legs. [4 marks]

With jointed legs:

Without jointed legs:

(b) Explain why classification is important for scientists studying biodiversity. [2 marks]

[6 marks]

19. The diagram below shows two plants, Plant X and Plant Y.

Image pending generation for this question.

Plant X: Has true roots, stems, and leaves. Produces spores on the underside of its leaves. Does not produce flowers or seeds.

Plant Y: Has true roots, stems, and leaves. Produces flowers and seeds enclosed in fruits.

(a) Identify the group to which Plant X belongs. [1 mark]

(b) Identify the group to which Plant Y belongs. [1 mark]

Difference 1: _______________________________________________

Difference 2: _______________________________________________

(d) Plant X grows well in damp, shady places. Explain why it cannot grow in dry, sunny places. [2 mark]

[6 marks]

20. Read the following passage and answer the questions that follow.

The tropical rainforest is one of the most biodiverse habitats on Earth. It is home to millions of species of plants, animals, fungi, and microorganisms. Scientists use classification systems to organise and study this vast diversity. By grouping organisms based on shared characteristics, scientists can identify patterns, understand evolutionary relationships, and develop conservation strategies.

(a) What does "biodiversity" mean? [1 mark]

(b) State TWO reasons why scientists classify organisms. [2 marks]

Reason 1: _______________________________________________

Reason 2: _______________________________________________

Example 1: _______________________________________________

Example 2: _______________________________________________

[5 marks]

END OF PAPER

Total: 40 marks

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Answers

Primary 6 PSLE Science Quiz - Diversity

Answer Key

Section A: Multiple Choice Questions

1. C) Presence of a backbone

Reasoning: Classification of living things into major groups (vertebrates vs. invertebrates, and further subgroups) is based on key structural characteristics. The presence or absence of a backbone is a primary distinguishing feature. Colour, size, and number of body parts are not reliable classification criteria as they can vary within groups.
[1 mark] — Award 1 mark for the correct answer only.

2. A) P

Reasoning: Birds are characterised by having feathers, lungs, and laying eggs. Only Organism P has all three of these characteristics. Organism R has feathers and lungs but does not lay eggs (which is unusual but could represent a male bird or a non-reproductive individual — however, P is the best fit). Organism Q is likely a mammal. Organism S lacks feathers and lungs, so it is not a bird.
[1 mark] — Award 1 mark for the correct answer only.

3. C) Lay eggs with hard shells

Reasoning: Most mammals give birth to live young. Only monotremes (e.g., platypus) lay eggs, and their eggs are leathery, not hard-shelled. Laying hard-shelled eggs is a characteristic of reptiles and birds. Having hair/fur, breathing through lungs, and producing milk are all standard mammalian characteristics.
[1 mark] — Award 1 mark for the correct answer only.

4. D) They are all living things that do not produce seeds (except rose plant — the student grouped non-flowering organisms).

Note: This question tests the student's ability to identify a grouping characteristic. Ferns, mosses, and mushrooms do not produce seeds. The rose plant DOES produce seeds, so the student may have been grouping the first three as non-seed-producing organisms. Option D is the best answer as it captures the intent of grouping non-seed-producing organisms.
Common mistake: Students may select C (spores), but mushrooms reproduce by spores, ferns reproduce by spores, and mosses reproduce by spores — however, rose plants do NOT reproduce by spores. The question is designed to test careful reading.
[1 mark] — Award 1 mark for D.

5. D) Frog

Reasoning: Frogs are amphibians and have a backbone (vertebral column), making them vertebrates. Earthworms, grasshoppers, and jellyfish are all invertebrates (they lack a backbone).
[1 mark] — Award 1 mark for the correct answer only.

6. C) A parrot

Reasoning: Following the key: A parrot has a backbone → Go to Step 2. A parrot has feathers → classified as a "Bird." A shark has a backbone but no feathers (it is a fish). A bat has a backbone and no feathers (it is a mammal). A lizard has a backbone, no feathers, and dry scaly skin (it is a reptile).
[1 mark] — Award 1 mark for the correct answer only.

7. B) Frog and toad

Reasoning: Frogs and toads are both amphibians. Spiders (arachnids) and crabs (crustaceans) are both arthropods but from different subgroups. Ferns (non-flowering) and roses (flowering) are from different plant groups. Mushrooms (fungi) and bacteria (monera) are from different kingdoms.
[1 mark] — Award 1 mark for the correct answer only.

8. B) To study the diversity of life in an organised way

Reasoning: Classification helps scientists organise the vast number of organisms into groups based on shared characteristics, making it easier to study, identify, and understand relationships between organisms.
[1 mark] — Award 1 mark for the correct answer only.

9. B) Reptiles

Reasoning: Reptiles are characterised by dry scaly skin, laying eggs with leathery shells, and being cold-blooded (ectothermic). Amphibians have moist skin. Fish have wet scales and breathe through gills. Mammals have fur/hair and are warm-blooded.
[1 mark] — Award 1 mark for the correct answer only.

10. C) Grass

Reasoning: Grass is a monocot flowering plant — it produces flowers (though they are small and wind-pollinated). Ferns, pine trees (gymnosperms), and mosses do not produce flowers. Pine trees produce cones, not flowers.
Common mistake: Students may think grass does not have flowers because the flowers are not showy. Clarify that grasses do produce flowers.
[1 mark] — Award 1 mark for the correct answer only.

Section B: Short Answer Questions

11.

(a) Bird [1 mark]

Reasoning: Organism W has feathers, which is the defining characteristic of birds.

(b) It has feathers, which is a characteristic unique to birds. [1 mark]

Accept any valid reason: "Only birds have feathers" / "Feathers are a characteristic of birds."
Marking note: The answer must refer to feathers as the identifying characteristic.

Reasoning: Amphibians have moist skin and lay eggs. Organism Z has moist skin (✓) and lays eggs (✓), matching amphibian characteristics.

12.

(a) Plant S [1 mark]

Reasoning: Following the key: Plant T has branching veins → Go to Step 2. Plant T produces seeds in fruits → Plant S.

(b) Both do NOT produce seeds enclosed in fruits OR Both are non-flowering plants OR Both do not produce flowers. [1 mark]

Reasoning: Plant Q has parallel veins (monocot characteristic but classified separately here) and Plant R produces seeds in cones. Neither produces seeds enclosed in fruits.
Accept any valid common characteristic.

13.

(a) Butterfly, spider, and crab [1 mark]

Reasoning: All three are arthropods. Butterflies and grasshoppers are insects; spiders are arachnids; crabs are crustaceans. All belong to the phylum Arthropoda.
Marking note: Award 1 mark only if all three are listed. Deduct if earthworm is included.

(b) They have jointed legs OR They have a hard exoskeleton (outer skeleton) OR Their bodies are divided into segments. [1 mark]

Accept any valid arthropod characteristic.

(c) The earthworm does not have jointed legs OR does not have a hard exoskeleton OR its body is not divided into distinct segments like arthropods. [1 mark]

Reasoning: Earthworms belong to the phylum Annelida. They have segmented bodies but lack jointed legs and a hard exoskeleton, which are key arthropod features.

14.

(a) Amphibian [1 mark]

Reasoning: The organism has smooth, moist skin, four legs, lays eggs in water, and breathes through lungs and skin — all characteristics of amphibians (e.g., frogs, toads, newts).

(b) The moist skin allows the organism to absorb oxygen directly from the water/air (cutaneous respiration), which helps it survive in both aquatic and terrestrial environments. [1 mark]

Accept: "Moist skin helps it breathe through its skin" / "The skin must stay moist for gas exchange to occur."
Marking note: The answer must link moist skin to survival (gas exchange/breathing).

15.

(a) Group X: Flowering plants (Angiosperms) [1 mark] Group Y: Non-flowering plants (Gymnosperms / Ferns / Mosses) [1 mark]

Reasoning: Group X produces flowers and seeds enclosed in fruits — characteristics of flowering plants (angiosperms). Group Y does not produce flowers and reproduces via spores or cones — characteristics of non-flowering plants.

(b) Fern / Pine tree / Moss / Conifer [1 mark]

Accept any valid non-flowering plant.

Section C: Structured / Application Questions

16.

(i) Bird [1 mark] (ii) Mammal [1 mark] (iii) Amphibian [1 mark] (iv) Arthropod [1 mark] (v) Worm / Annelid [1 mark]

Reasoning: The key follows standard vertebrate/invertebrate classification. Vertebrates with feathers are birds; with fur/hair are mammals; with moist skin are amphibiates. Invertebrates with jointed legs are arthropods; without jointed legs are worms/annelids.
Marking note: Accept "Annelid" or "Worm" for (v). Accept "Insect/Arthropod" for (v) — but "Arthropod" is preferred as it is the broader group.

17.

(a) [5 marks — 1 mark each]

A: Bird [1 mark]

Has feathers, warm-blooded, lays eggs → Bird.

B: Mammal [1 mark]

Has fur/hair, warm-blooded, produces milk → Mammal.

C: Fish [1 mark]

Cold-blooded, has scales, lays eggs, breathes through gills → Fish.

D: Reptile [1 mark]

Cold-blooded, has scales, lays eggs, does NOT breathe through gills → Reptile.

E: Amphibian [1 mark]

Cold-blooded, has moist skin, lays eggs, breathes through gills at some stage → Amphibian.

(b) Lizard / Snake / Tortoise / Crocodile / Gecko / Iguana [1 mark]

Accept any valid reptile that lives on land and breathes only through lungs.
Marking note: Do NOT accept "frog" (amphibian) or "fish" (breathes through gills).

18.

(a) [4 marks — 2 marks each]

With jointed legs: Ant, grasshopper, butterfly, spider, millipede, caterpillar [2 marks]

Marking note: Award 2 marks if all six are listed correctly. Deduct ½ mark for each error/omission.

Without jointed legs: Snail, earthworm [2 mark]

Marking note: Award 2 marks if both are listed correctly.

(b) [2 marks]

Sample answer: "Classification helps scientists organise organisms into groups based on shared characteristics. This makes it easier to study biodiversity, identify new species, and understand how different organisms are related to each other. It also helps in conservation efforts by identifying which species are endangered and need protection."
Marking scheme:
- 1 mark for stating that classification helps organise/organise organisms.
- 1 mark for explaining a benefit (e.g., studying biodiversity, identifying species, conservation, understanding relationships).
Accept any valid reasoning.

19.

(a) Fern (Non-flowering plant) [1 mark]

Reasoning: Plant X has true roots, stems, and leaves but produces spores instead of seeds/flowers — characteristic of ferns.

(b) Flowering plant (Angiosperm) [1 mark]

Reasoning: Plant Y produces flowers and seeds enclosed in fruits — characteristic of flowering plants.

Sample differences:

Difference 1: Plant X reproduces by spores, while Plant Y reproduces by seeds.
Difference 2: Plant X does not produce flowers, while Plant Y produces flowers.
Accept: "Plant X does not produce fruits, while Plant Y produces fruits" / "Plant X's seeds are not enclosed in fruits, while Plant Y's seeds are enclosed in fruits."

(d) [2 marks]

Sample answer: "Plant X (fern) needs water for reproduction because its sperm cells need to swim through water to reach the egg cells. In dry, sunny places, there is not enough water for this process to occur. Additionally, ferns do not have a waxy cuticle to prevent water loss, so they would dry out in sunny conditions."
Marking scheme:
- 1 mark for mentioning water is needed for reproduction (sperm needs water to swim).
- 1 mark for mentioning lack of adaptation to dry conditions (no waxy cuticle / would dry out / needs damp environment).
Accept any valid explanation linked to water dependence.

20.

(a) [1 mark]

Sample answer: "Biodiversity refers to the variety of living organisms (plants, animals, fungi, microorganisms) found in a particular habitat or on Earth as a whole."
Accept: "The variety of life" / "The different types of living things in an area."

(b) [2 marks — 1 mark each]

Sample reasons:

Reason 1: To organise and study organisms in a systematic way.
Reason 2: To understand evolutionary relationships between organisms / To identify and name new species / To develop conservation strategies.
Accept any two valid reasons.

Sample answers:

Example 1: By classifying organisms, scientists can identify which species are endangered and need protection.
Example 2: Understanding diversity helps scientists understand how organisms depend on each other in ecosystems, so they can protect entire habitats rather than just individual species.
Accept: "Helps identify keystone species" / "Helps track population changes" / "Helps prioritise conservation efforts."
Marking note: Answers must link understanding diversity to a specific conservation action or benefit.

END OF ANSWER KEY

Mark Allocation Summary:

Section A (Q1–10): 10 marks
Section B (Q11–15): 13 marks
Section C (Q16–20): 25 marks (Q16: 5, Q17: 6, Q18: 6, Q19: 6, Q20: 5 — adjusted to fit)
Total: 40 marks