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Primary 4 Science Diversity Quiz
Free P4 Science Diversity quiz, Kimi2.6 Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.
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Primary 4 Science Quiz - Diversity (Answer Key)
Total Marks: 40 marks
Section A: Multiple Choice (2 marks each)
1. B — Frog, mushroom, grass
Explanation: Living things can grow, reproduce, respond to stimuli, and need food. Rocks, water, plastic, rubber, and metals are non-living things. A mushroom is a fungus (living), while frogs and grass are clearly living things. (2 marks)
2. B — vertebrates
Explanation: Vertebrates are animals with a backbone (also called a spinal column or spine). Invertebrates do NOT have a backbone. Amphibians are a type of vertebrate, and molluscs are invertebrates. (2 marks)
3. B — Humps that store fat
Explanation: Camels live in hot deserts where food and water are scarce. Their humps store fat, which can be converted to energy and water when needed. Thick fur would cause overheating; gills and webbed feet are for aquatic life. (2 marks)
4. B — Insect
Explanation: Following the key: "Does it have wings?" → Yes → "Does it have feathers?" → No → leads to insect. Birds have feathers; insects have wings but no feathers. (2 marks)
5. B — photosynthesis
Explanation: Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to make their own food (glucose). Respiration releases energy; digestion breaks down food; germination is when a seed begins to grow. (2 marks)
6. C — They can move from place to place
Explanation: While many animals move, not all living things can move from place to place. Plants are living things but they cannot move around. All living things can grow, reproduce, and respond to stimuli. (2 marks)
7. B — fungus
Explanation: Mushrooms are fungi. They cannot make their own food like plants do. Instead, they absorb nutrients from dead or decaying matter. This makes them decomposers in the ecosystem. (2 marks)
8. B — A and D
Explanation: The dolphin (A) and the bat (D) are both mammals. Dolphins are marine mammals that breathe air through lungs and give birth to live young. Bats are the only mammals that can truly fly. Penguins are birds (have feathers, lay eggs); sharks are fish (have scales, gills). (2 marks)
9. C — Light and feathery wings
Explanation: Seeds with light, wing-like structures (e.g., seeds of lallang or saga tree) can be carried long distances by wind. Fleshy/juicy seeds attract animals for animal dispersal; hooks attach to animal fur; hard smooth seeds may be dispersed by water or splitting. (2 marks)
10. C — Bacteria are too small to see without a microscope
Explanation: Bacteria are single-celled microorganisms (microbes) that are invisible to the naked eye. Not all bacteria are harmful—some help with digestion and make food (like yogurt); bacteria are not plants; they have only one cell, unlike multicellular animals. (2 marks)
Section B: Short Answer (3 marks each)
11. (a) Any TWO from: can grow, can reproduce, need food/nutrients, respond to stimuli, breathe/respire, excrete waste [1]
(b) Example: A seed germinates and grows into a plant / A plant grows bigger and produces more leaves / A plant bends toward light [2]
Marking notes: [1 mark for naming characteristic; 2 marks for specific example with explanation of the characteristic shown]
12. Completed table:
| Organism | Can make own food | Has backbone | Lives in water |
|---|---|---|---|
| Buttercup | ✓ | ||
| Earthworm | |||
| Salmon | ✓ | ✓ | |
| Spider |
[3 marks]
Marking notes: [1 mark per correct row; must have all three ticks correctly placed for full marks]
13. (a) Vertebrates have a backbone; invertebrates do not have a backbone [1]
(b) Any one: ant, spider, worm, snail, butterfly, cockroach, jellyfish, crab [1]
(c) Humans are mammals because they have hair/fur (even if little), give birth to live young, and female humans produce milk to feed their babies [1]
Marking notes: Any two mammal characteristics accepted for [1 mark]
14. (a) Grass and plants [1]
(b) Grass → Grasshopper → Frog [1] (accept: Plants → Grasshopper → Frog)
(c) The grasshopper population would increase/get larger because there would be no frogs to eat them [1]
Marking notes: For (c), must mention increase in grasshoppers AND reason (no predator/frog to eat them)
15. (a) S [1]; It is thick and fleshy, which helps store water [1]
(b) It has a large, broad surface to capture more sunlight in shady conditions / The broad flat shape is not easily damaged in low wind [1]
Marking notes: For (a), must identify correct leaf AND give correct explanation about water storage. For (b), must link broad flat shape to either capturing more light OR stability in low wind.
16. (a) Butterfly (or moth) [1]
(b) Pupa (or chrysalis) [1]
(c) It is called complete metamorphosis because the animal goes through four very different stages (egg, larva, pupa, adult), and the adult looks completely different from the larva [1]
Marking notes: For (c), mention of "four stages" OR "adult looks different from young" acceptable. Must show understanding of dramatic change in form.
Section C: Structured Questions (5 marks each)
17. (a) To find out if different types of soil affect plant growth / To find out which type of soil is best for plant growth [1]
(b) Any TWO from: same type of plant seed, same amount of water, same size pot, same temperature/location (25°C), same amount of sunlight [2 marks: 1 each]
(c) Loamy soil (Y) [1]; The plant in loamy soil is the tallest/healthiest-looking compared to the plant in sandy soil (smallest/wilting) and clay soil (medium/slightly yellow) [1]
Marking notes: For (c), must identify correct soil AND use evidence from diagram comparing plant appearance in at least one other soil type.
18. (a) Group 3 — Animals with scales [1]
(b) Body covering (or type of outer covering/skin) [1]
(c) Agree or disagree accepted if well-reasoned. [3 marks]
Agree with reasoning correction: I do not agree with the student's reason. [1] While whales live in water, they breathe air through lungs, have hair (tiny bristles), and give birth to live young — these are mammal features. [1] Fish have scales and breathe through gills. [1]
OR
I agree that the student's REASON is not good, but the whale IS correctly placed in Group 2. [1] Where an animal lives is not the best way to classify it. [1] We should use body features like having fur/hair and feeding babies with milk, which whales do. [1]
Marking notes: Must address both the habitat argument AND the correct classification basis (body covering/reproduction method). Maximum [1] if only states disagreement without explanation.
19. (a) Water / Presence of water [1]
(b) Any TWO from: same type of seed, same number of seeds (five), same type of container/cup, same location/warm cupboard, same duration (5 days), same amount of cotton wool, same air holes in lids [2 marks: 1 each]
(c) Seeds need water to germinate [1]; The seeds with water (Cup B) germinated/had roots growing, but seeds without water (Cup A) did not germinate [1]
Marking notes: For (c), must state conclusion AND provide evidence from the diagram comparing both cups.
20. (a) Tropical Rainforest [1]
(b) The tropical rainforest has more layers/canopy/vegetation, providing more food sources and habitats/shelter for different animals [2 marks: 1 for food sources, 1 for shelter/habitat variety]
(c) The pond [1]; The tropical rainforest already has very high diversity (45 species), so changes from pollution may be harder to detect. The pond has fewer species (20), so changes would be more obvious/easier to measure [1]
Alternative accepted: Tropical rainforest [1]; It has the greatest variety of species, so scientists can see how pollution affects many different types of animals and compare which are most sensitive [1]
Marking notes: For (c), must give valid scientific reasoning for whichever habitat chosen. "Easier to see changes" or "more species to study" are both acceptable lines of reasoning.
END OF ANSWER KEY