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Primary 5 Science Weighted Assessment 1 (Term 1) Paper 5
Free P5 Science WA1 Paper 5, 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)
Topic Focus: Diversity (Cells, Classification, Adaptations) Version: 5
Section A (28 marks)
Each correct answer carries 2 marks.
- (3) The nucleus controls the activities of the cell.
- Note: (1) is incorrect because animal cells do not have cell walls. (2) is incorrect because animal cells do not have chloroplasts. (4) is incorrect because cells are the basic unit of living things.
- (3) Cat.
- Reasoning: Q has a backbone and gives birth to young. This is a characteristic of mammals. Cats are mammals. Butterflies and Spiders have no backbone. Goldfish lay eggs.
- (3) Algae.
- Reasoning: Algae are simple plant-like organisms found in water that contain chlorophyll and can photosynthesize. Bacteria and Fungi generally do not photosynthesize (with rare exceptions not covered at P5). Viruses are non-living.
- (2) To reduce water loss through transpiration.
- Reasoning: Broad leaves have many stomata which lose water. Spines have a very small surface area, minimizing water loss in hot, dry deserts.
- (1) Whale, Bat, Dolphin.
- Reasoning: All three are mammals (give birth, breathe with lungs, have hair/fur at some stage). Penguins are birds. Sharks are fish. Frogs are amphibians.
- (1) A (Palisade Layer).
- Reasoning: The palisade layer contains many chloroplasts and is located near the top of the leaf to trap maximum sunlight.
- (3) They feed on dead and decaying matter.
- Reasoning: Fungi are saprophytes. They do not have chlorophyll (1), do not lay eggs (2), and do not have true roots/stems/leaves (4).
- (3) Seal.
- Reasoning: Group Z describes mammals (hair/fur, gives birth, lungs). Seals are mammals. Crocodiles are reptiles. Platypus lays eggs (monotreme). Penguins are birds.
- (2) They cannot reproduce on their own outside a host.
- Reasoning: This is the key reason viruses are often considered on the border of living/non-living. They need a host cell to replicate.
- (2) White fur for camouflage in snow.
- Reasoning: Camouflage helps them hide from prey and predators. Thin skin (1) would cause heat loss. Large ears (3) would cause heat loss. Webbed feet (4) are for swimming, not climbing trees.
- (2) X (Larva).
- Reasoning: Mosquito larvae (wrigglers) live in water and breathe air through a siphon tube at the surface. Pupae (tumblers) also breathe but do not feed; however, the siphon is most distinctly associated with the larval stage in primary science contexts. Correction: Both Larva and Pupa breathe via siphon/tubes, but Larva is the active feeding stage often depicted with the siphon. In P5, Larva is the standard answer for "wriggler" breathing.
- (3) Some bacteria are used to make yogurt and cheese.
- Reasoning: Lactobacillus is a useful bacterium. Not all bacteria are harmful (1). Bacteria are unicellular (2). Bacteria reproduce by cell division, not eggs (4).
- (3) A fungus (e.g., Mould).
- Reasoning: Fungi have cell walls and nuclei (eukaryotic) but no chloroplasts (cannot photosynthesize). Plants have chloroplasts. Animals have no cell walls. Bacteria have no nucleus (prokaryotic).
- (3) It maintains the balance of the ecosystem and provides resources.
- Reasoning: Biodiversity ensures ecosystem stability, resilience, and provides food/medicine.
Section B (28 marks)
15. Cells (a) Cell A: Animal Cell [1] Cell B: Plant Cell [1] (b) Function of X (Cell Wall): To give the plant cell a regular shape and provide support/protection. [1] (c) Cell B is green because it contains chloroplasts which have chlorophyll. Cell A does not have chloroplasts. [1]
16. Classification (a) Shark [1] (b) Bat is a mammal while Eagle is a bird. [1] * Elaboration: Bats give birth to young and have fur/hair, whereas Eagles lay eggs and have feathers. [1] (c) It would fit with the Turtle (or Reptiles). It shares the characteristic of having dry scaly skin and laying eggs. [1]
17. Microorganisms (a) Accept any valid pair: * Microorganism: Yeast / Lactobacillus [1] * Use: To make bread rise / To make yogurt/cheese [1] * Alternative: Bacteria in gut help digestion. (b) (i) Fungi [1] (ii) Keep it in the refrigerator / Keep it in a dry place / Seal it in an airtight container. [1] * Reasoning: Mould needs warmth and moisture to grow. Removing these conditions slows growth.
18. Cactus Adaptation (a) Function of A (Spines): To reduce water loss (by reducing surface area) AND to protect the plant from animals eating it. [1] * Note: Either reason is acceptable, but water loss is the primary physiological adaptation linked to leaf modification. (b) Function of B (Stem): It is thick and fleshy to store water. [1] It is also green to carry out photosynthesis (since there are no leaves). [1] (c) Extensive shallow roots allow the cactus to absorb rainwater quickly from a large area before it evaporates. [1]
19. Diversity in Plants (a) Rose [1] (b) Ferns have vascular tissue (transport tubes) which transport water and nutrients to all parts of the plant and provide structural support. [1] Mosses lack vascular tissue, so they cannot grow tall as they cannot transport water efficiently against gravity. [1] (c) They reproduce by spores. [1]
20. Adaptation and Survival (a) Tweezers [1] (b) A duck's broad, flat beak acts like a sieve/strainer. [1] It allows the duck to filter small organisms and plants from the water while letting the water drain out. [1] (c) The bird population would decrease or die out. [1] * Reasoning: The thin beak is not adapted to crack hard nuts. The birds would struggle to get food, leading to starvation and inability to reproduce. [1] * Alternative acceptable answer: Over a very long time, birds with slightly stronger beaks might survive (natural selection), but in the context of P5 "what happens to the population," decline/extinction is the immediate consequence of poor adaptation.
Marking Notes for Teachers/Parents:
- Q15: Ensure students distinguish between cell wall (plant only) and cell membrane (both).
- Q16: Emphasize that classification is based on observable characteristics, not just habitat.
- Q18: Accept "store water" for the stem. Do not accept "store food" as the primary adaptation for survival in drought (though stems do store some energy, water storage is the key xerophytic adaptation).
- Q20: For part (c), look for the link between beak shape, food source, and survival.