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Primary 5 Science Weighted Assessment 3 (Term 3) Paper 4
Free P5 Science WA3 Paper 4, Qwen3.7 Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.
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TuitionGoWhere Practice Paper - Science Primary 5
Answer Key & Marking Scheme
Paper: WA3 - Version 4
Topic: Diversity
Section A (28 marks)
1. (2)
- Reasoning:
- P (Scales, Eggs) = Reptile.
- Q (Moist skin, Eggs in water) = Amphibian.
- R (Feathers, Eggs) = Bird.
- S (Hair, Live birth) = Mammal.
- Option (2) correctly identifies Q as Amphibian and S as Mammal.
2. (3)
- Reasoning:
- Group A: Plants (Chlorophyll). Fern is a plant. Correct.
- Group B: Non-plants. Mushroom is a fungus (Group B). Option (1) is wrong.
- Group X: 6 legs (Insects). Grasshopper has 6 legs, so it is in X, not Y. Option (2) is wrong.
- Group Y: Not 6 legs. Spider has 8 legs, so it is in Y, not X. Option (4) is wrong.
3. (2)
- Reasoning: Spines are modified leaves. Leaves have stomata which lose water. By reducing leaves to spines, the surface area for water loss is minimized. The thick stem stores water (not the spines).
4. (4)
- Reasoning:
- Snake and Earthworm both move by contracting muscles against the ground (slithering/crawling).
- Dolphin and Shark both swim using fins/tails.
- Eagle and Bat both fly using wings.
- Therefore, all pairs share the same method of locomotion.
5. (1)
- Reasoning: As Population Y increases, Population X decreases. This suggests Y is eating X (Predator-Prey) or competing. However, in typical primary science graphs, if one rises as the other falls drastically, it often indicates predation or competition. Given the options, if Y were a predator, X (prey) would decrease. If they competed, both might suffer, but one might outcompete the other. Option (1) is the most standard interpretation of such inverse curves in this context (Predator Y increases, Prey X decreases). Note: In some contexts, competition is also valid, but predation is a stronger direct link for "one goes up, one goes down" in simple models.
6. (3)
- Reasoning: Large ears are an adaptation for hot environments (like elephants or fennec foxes) to release heat. Polar bears have small ears to reduce heat loss.
7. (2)
- Reasoning: 6 legs = Insect. Arachnids have 8 legs. Crustaceans have more than 6 (usually 10+). Myriapods have many legs.
8. (1)
- Reasoning: Fish live in water. Water contains dissolved oxygen. Gills are specialized to extract dissolved oxygen from water. Lungs extract oxygen from air.
9. (1)
- Reasoning:
- Frogs eat Grasshoppers. If Frogs decrease, fewer Grasshoppers are eaten Grasshopper population Increases.
- Snakes eat Frogs. If Frogs decrease, Snakes have less food Snake population Decreases.
10. (3)
- Reasoning: Fungi are not plants (no chlorophyll). They are saprophytes/decomposers that obtain nutrients from dead organic matter.
11. (2)
- Reasoning: The Palisade Mesophyll layer contains the highest concentration of chloroplasts and is located near the upper surface to trap maximum sunlight.
12. (1)
- Reasoning: Long eyelashes protect eyes from sandstorms. Humps store fat (not water). Thin skin would lose water. Webbed feet are for swimming.
13. (3)
- Reasoning: Algae are the producers. Tadpoles eat algae directly. If algae die, Tadpoles lose their food source immediately. Fish and Herons are further up the chain and will be affected later.
14. (2)
- Reasoning:
- (1) Fern and Moss are non-flowering.
- (2) Sunflower, Orchid, Hibiscus are all flowering plants.
- (3) Pine is a conifer (non-flowering seed plant), Fern is non-flowering.
- (4) These are fungi.
Section B (28 marks)
15. (a) [2 marks]
- Bird A: Seeds / Nuts / Hard-shelled food. [1]
- Bird B: Nectar / Insects from deep flowers. [1]
(b) [2 marks]
- The long, thin beak allows Bird B to reach deep into flowers to access nectar [1] which other birds with short beaks cannot reach. [1]
16. (a) [1 mark]
- Moss (or Bryophyte).
(b) [2 marks]
- Organism K (Fern) reproduces by spores [1], while Organism L (Flowering plant) reproduces by seeds/flowers. [1]
(c) [2 marks]
- Mosses do not have true vascular tissue (roots/stems) to transport water efficiently [1]. They absorb water directly through their surface, so they need a damp environment to prevent drying out. [1]
- Alternative: Their sperm needs water to swim to the egg for fertilization.
17. (a) [1 mark]
- As the distance from the lamp increases, the number of bubbles produced decreases.
(b) [2 marks]
- Increasing the distance reduces the light intensity reaching the plant [1]. Since light is needed for photosynthesis, a lower light intensity results in a slower rate of photosynthesis, producing fewer oxygen bubbles. [1]
(c) [1 mark]
- Oxygen.
18. (a) [1 mark]
- Frog OR Snake OR Eagle.
- Note: Grasshopper is Primary. Frog eats Grasshopper (Secondary). Snake eats Frog (Tertiary). Eagle eats Snake (Quaternary) or Rabbit (Secondary).
- Accept Frog, Snake, or Eagle. (Most straightforward is Frog).
(b) [2 marks]
- The population of snakes will decrease [1] because frogs are their food source. With fewer frogs, snakes will have less food and may starve or move away. [1]
(c) [2 marks]
- The sun provides light energy [1] which is needed by the grass (producers) to perform photosynthesis and make food. This energy is then passed through the food web. [1]
19. (a) [2 marks]
- The muddy soil in mangroves has very little air/oxygen [1]. The pneumatophores stick out of the mud to absorb oxygen from the air for respiration. [1]
(b) [1 mark]
- Thick, waxy cuticle on leaves OR Small leaf surface area.
20. (a) [5 marks]
- Dolphin: Mammal [1]
- Penguin: Bird [1]
- Crocodile: Reptile [1]
- Toad: Amphibian [1]
- Goldfish: Fish [1]
(b) [2 marks]
- Penguins have feathers [1] and lay eggs with hard shells [1]. Mammals have hair/fur and give birth to live young (mostly).
- Note: Accept "Has wings" or "Has a beak" as secondary characteristics, but Feathers/Eggs are the primary classifiers.