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Primary 5 Science Weighted Assessment 1 (Term 1) Paper 2
Free P5 Science WA1 Paper 2, Qwen3.7 Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.
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TuitionGoWhere Practice Paper - Science Primary 5 (WA1 Version 2)
Answer Key and Marking Scheme
Section A (28 marks)
1. (2)
- Reasoning: The nucleus contains genetic material and controls cell activities. (1) is incorrect because animal cells lack cell walls. (3) is incorrect because all cells have cell membranes. (4) is incorrect because animal cells do not have chloroplasts.
2. (4)
- Reasoning: Part A is the cell wall (provides shape/support). Part B is the vacuole (contains cell sap). Part C is the chloroplast (site of photosynthesis). All statements are correct.
3. (1)
- Reasoning: Group Q represents vertebrates that give birth to young (Mammals). Bats are mammals. Penguins are birds (lay eggs). Spiders and butterflies are invertebrates.
4. (2)
- Reasoning: Reproduction ensures that the species continues to exist even after the parents die. It does not necessarily increase the number of species (that is evolution/speciation), nor is it primarily for food or growth.
5. (3)
- Reasoning: Sexual reproduction involves the male parts (Anther W) and female parts (Stigma X, Ovary Y). Petals (Z) attract pollinators but are not directly involved in the fusion of gametes.
6. (1)
- Reasoning: The correct sequence is Pollination (transfer of pollen) → Fertilisation (fusion of gametes) → Seed Dispersal (spreading seeds) → Germination (growth of new plant).
7. (2)
- Reasoning: Covering the male parts (tassels) prevents pollen from being carried by wind or insects to other plants, thus preventing cross-pollination.
8. (3)
- Reasoning: Wind-dispersed seeds are typically light and have structures like wings or hairs to catch the wind. Juicy fruits are for animals, hooks are for animals, and hard coats are often for water or protection.
9. (2)
- Reasoning: Coconuts have a fibrous, air-filled husk that allows them to float on water. They are dispersed by water.
10. (1)
- Reasoning: Seeds germinate underground where there is no sunlight. They need water, air (oxygen), and suitable temperature. Sunlight is needed for photosynthesis after the shoot emerges.
11. (2)
- Reasoning: The only difference between Beaker A and B is the presence of water (wet vs dry cotton wool). This is the changed variable.
12. (2)
- Reasoning: The testes produce sperm. The penis is for transfer, urethra is a tube, and sperm duct transports sperm.
13. (3)
- Reasoning: Fertilisation occurs in the oviduct (fallopian tube) where the sperm meets the egg.
14. (1)
- Reasoning: The egg is much larger than the sperm because it contains cytoplasm and food reserves for the developing embryo. Sperm are small and motile.
Section B (28 marks)
15. (a) Cell A: Animal Cell [1] Cell B: Plant Cell [1] (b) To control the activities of the cell. [1] Teaching Note: The nucleus contains DNA which instructs the cell on what to do. (c) Cell B is a plant cell and needs to make its own food through photosynthesis, which requires chloroplasts. Cell A is an animal cell and gets food from eating other organisms, so it does not need chloroplasts. [1]
16. (a) Animal: Q [1] Reason: It has fur and gives birth to young. [1] Teaching Note: Both characteristics are key identifiers for mammals. (b) The young look like the adults (no metamorphosis) OR They feed their young with milk. [1] Note: Since Q is the mammal, S is the amphibian. A key characteristic of amphibians is moist skin for gas exchange (already in table) or undergoing metamorphosis. Another valid answer is that they lay eggs in water/jelly-like eggs. (c) Animal P: Reptile [1] Animal R: Bird [1]
17. (a) Pollination [1] (b) The ovary develops into a fruit. [1] The ovules inside the ovary develop into seeds. [1] Teaching Note: Students often confuse ovary and ovule. Ovary → Fruit; Ovule → Seed. (c) To reduce overcrowding and competition for water, nutrients, and sunlight with the parent plant. [1]
18. (a) To find out if temperature affects seed germination. [1] (b) Cup: Y [1] Explanation: It is set at room temperature (25°C), which is the normal/ideal condition for comparison. [1] Teaching Note: The control set-up represents the "normal" state where the variable being tested is not extreme. (c) Cup: Y [1] Reason: 25°C is a suitable temperature for enzyme activity in seeds. 4°C is too cold and 60°C is too hot, which may kill the seeds or denature enzymes. [1]
19. (a) Label: A [1] (b) No. [1] Fertilisation occurs in the oviduct (B). If it is blocked, sperm cannot reach the egg. [1] (c) It is where the fertilised egg (embryo) develops into a fetus. [1]
20. (a) Both start with an egg. OR Both have young that look different from adults (incomplete/complete metamorphosis involves change). [1] Note: "Both undergo metamorphosis" is also acceptable, though the type differs. (b) The young of the butterfly (caterpillar) looks very different from the adult and has no wings. The young of the cockroach (nymph) looks similar to the adult but is smaller and has no wings. [2] Marking: 1 mark for describing butterfly young, 1 mark for describing cockroach young. (c) To allow for the drastic change in body structure from larva to adult (metamorphosis). [1] Teaching Note: The pupal stage is a resting stage where the body is reorganized.