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Primary 5 Science Weighted Assessment 2 (Term 3) Paper 1
Free P5 Science WA2 Paper 1, Qwen3.7 Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.
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Questions
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Answers
Answer Key - Science Primary 5 WA2 Practice Paper (Version 1)
Section A (28 marks)
1. (2)
- Reasoning: The nucleus contains genetic material and controls cell activities. Not all cells have cell walls (animal cells don't). Plant cells have cell membranes. Animal cells do not have chloroplasts.
2. (1)
- Reasoning: Pollination is the transfer of pollen from the anther (male part, B) to the stigma (female part, A).
3. (3)
- Reasoning: Sexual reproduction involves two parents and the fusion of male (sperm) and female (egg) reproductive cells. Offspring are not identical to parents.
4. (2)
- Reasoning: Stage X is the larva (caterpillar). This is the feeding stage where it eats leaves to store energy for metamorphosis into the pupa and adult. The adult (Z) mainly feeds on nectar for energy for flight/reproduction, but the bulk of growth happens in the larval stage.
5. (2)
- Reasoning: Ferns reproduce by spores. Roses, mangoes, and hibiscus are flowering plants that reproduce by seeds.
6. (1)
- Reasoning: Fruit P is light with wings, adapted for wind dispersal. Fruit Q is fibrous and waterproof, adapted for water dispersal (e.g., coconut).
7. (2)
- Reasoning: Seed dispersal reduces overcrowding, which minimizes competition for water, sunlight, and nutrients among the parent plant and its offspring.
8. (1)
- Reasoning: The correct sequence is Pollination (transfer of pollen) → Fertilisation (fusion of cells) → Seed Dispersal (spreading seeds) → Germination (growth of new plant).
9. (3)
- Reasoning: Fertilisation in humans typically occurs in the oviduct (fallopian tube). The ovary produces eggs, the uterus is where the baby develops.
10. (4)
- Reasoning: Seeds need water, air (oxygen), and suitable temperature to germinate. Sunlight is not required for germination (though it is needed for photosynthesis after the seedling emerges).
11. (2)
- Reasoning: Tube B has water, air, and suitable temperature (room temp). Tube A lacks water. Tube C lacks air. Tube D has low temperature.
12. (3)
- Reasoning: Asexual reproduction is generally faster and requires only one parent. Offspring are genetically identical. It does not involve fusion of cells.
13. (1)
- Reasoning: Part X is the testes. Their function is to produce sperm and male hormones.
14. (2)
- Reasoning: Cockroaches have a 3-stage life cycle: Egg → Nymph → Adult. Frogs, butterflies, and mosquitoes have 4-stage life cycles (including a larval stage that looks different from the adult).
Section B (28 marks)
15. (a) Cross-pollination [1]
- Note: Accept "Pollination" but "Cross-pollination" is more precise given the diagram shows two different flowers.
(b) Explanation:
- Pollination leads to fertilisation. [1]
- Fertilisation is the fusion of the male reproductive cell (from pollen) and the female reproductive cell (in the ovule), which is necessary for the ovule to develop into a seed. [1]
16. (a) 3 stages [1]
(b) Similarity:
- Both have six legs. [1]
- OR Both have similar body shape/structure.
- OR Both have antennae.
(c) Reason for moulting:
- The nymph has a hard outer skeleton (exoskeleton) that does not grow. [1]
- It must shed the old skin to allow its body to grow larger.
17. (a) No, the hypothesis was not supported. [1]
- Explanation: The seeds in Pot B (darkness) germinated just like the seeds in Pot A (sunlight). This shows that sunlight is not a necessary condition for germination. [1]
(b) Explanation:
- Sunlight is needed for photosynthesis. [1]
- Without sunlight, the seedlings in Pot B could not make chlorophyll (which makes them green) or food, so they remained yellow and weak. [1]
18. (a) Ovary (Part P) [1]
(b) Explanation:
- Part Q is the oviduct. [1]
- If it is blocked, the sperm cannot swim up to meet the egg, or the fertilised egg cannot travel to the uterus. Therefore, fertilisation cannot occur. [1]
19. (a) Asexual reproduction [1]
(b) Advantage:
- The new plants are genetically identical to the parent, so desirable traits (e.g., taste, size) are preserved. [1]
- OR It is faster than growing from seeds.
- OR It does not depend on pollinators or weather conditions for seed production.
20. (a) Characteristic of Fruit X:
- It is light / has a large surface area / has wing-like structures / has hair-like structures. [1]
- Any one valid adaptation for wind dispersal.
(b) Explanation for Fruit Y:
- The hooks allow the fruit to attach to the fur of animals or clothing of humans. [1]
- The animal carries the fruit away from the parent plant and drops it elsewhere, aiding dispersal. [1]
(c) Importance of dispersal for Fruit Z:
- To reduce competition for resources (water, sunlight, nutrients, space) between the parent plant and the offspring. [1]
- To prevent overcrowding which can lead to the spread of diseases. [1]