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Primary 5 Science Weighted Assessment 2 (Term 3) Paper 3
Free P5 Science WA2 Paper 3, Qwen3.7 Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.
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Answers
TuitionGoWhere Practice Paper - Science Primary 5 (WA2 Version 3)
Answer Key and Marking Scheme
Section A (20 marks)
| Question | Answer | Marks |
|---|---|---|
| 1 | 2 | 1 |
| 2 | 1 | 1 |
| 3 | 3 | 1 |
| 4 | 2 | 1 |
| 5 | 3 | 1 |
| 6 | 2 | 1 |
| 7 | 4 | 1 |
| 8 | 3 | 1 |
| 9 | 3 | 1 |
| 10 | 3 | 1 |
| 11 | 2 | 1 |
| 12 | 2 | 1 |
| 13 | 3 | 1 |
| 14 | 3 | 1 |
| 15 | 3 | 1 |
| 16 | 2 | 1 |
| 17 | 3 | 1 |
| 18 | 3 | 1 |
| 19 | 4 | 1 |
| 20 | 2 | 1 |
Section B (40 marks)
21. (a) Pollination and Fertilisation (Accept "Fertilisation" as the key process leading to seed formation, but pollination is the precursor). [1] Teaching Note: Pollination transfers pollen; fertilisation fuses cells. Both are needed for seeds.
(b) Any two of the following: [2]
- Water
- Oxygen (Air)
- Suitable temperature Note: Sunlight is NOT required for germination.
(c) To reduce overcrowding / To reduce competition for water, nutrients, sunlight, and space between the parent plant and the offspring. [2] Marking: 1 mark for "reduce overcrowding/competition", 1 mark for specifying resources (water/nutrients/light).
22. (a) A: Stigma [1] D: Anther [1]
(b) Pollen [1]
(c) No. [1] Explanation: The stigma (Part A) receives pollen. Without it, pollination cannot occur, so fertilisation cannot take place, and no fruit/seeds will form. [1] Teaching Note: Students must link the removal of the stigma to the failure of pollination/fertilisation.
23. (a) To attract animals to eat the fruit. The seeds are then dispersed when the animals excrete them elsewhere. [1]
(b) The fibrous husk traps air, making the fruit buoyant (able to float). This allows it to be carried by water currents to new locations. [2] Marking: 1 mark for "traps air/floats", 1 mark for "carried by water".
(c) Plant X would fail to disperse effectively. [1] Explanation: Plant X relies on wind (light/winged). Near the sea, it may fall into water and sink or rot, or wind dispersal is less effective if it lands in water. (Alternatively, Plant Z relies on water; in an open field, it cannot float away). Accept logical reasoning based on mismatched method and environment. [1]
24. (a) Q [1] Teaching Note: Fertilisation occurs in the oviduct (fallopian tube).
(b) To produce eggs (female reproductive cells). [1]
(c) No. [1] Explanation: The oviduct (Part Q) is where fertilisation takes place and where the egg travels. If blocked, sperm cannot meet the egg, so fertilisation cannot occur. [1]
25. (a) To find out if sunlight is needed for seed germination. [1]
(b) Amount of water / Type of seeds / Temperature / Amount of cotton wool. (Any one) [1]
(c) Sunlight is not needed for seed germination. [1]
(d) To provide water/moisture, which is a necessary condition for germination. [1]
26. (a) Testes [1]
(b) Testes -> Sperm Duct -> Urethra -> Penis (out of body). [2] Marking: 1 mark for correct sequence of at least two parts, 1 mark for complete correct path.
27. (a) Vegetative propagation (or Asexual reproduction using tubers). [1]
(b) Offspring are genetically identical to the parent (desirable traits are preserved) / Faster growth / No need for pollination. (Any one) [1]
(c) Lack of genetic variation. If a disease affects the parent, it will likely affect all offspring, potentially wiping out the whole crop. [1]
28. (a) 30 [1]
(b) The high temperature (50°C) may have killed the seeds / damaged the enzymes needed for germination. [2] Teaching Note: Extreme heat denatures enzymes or kills the living embryo.
(c) Fewer seeds would germinate at 10°C than at 30°C. [1] Teaching Note: 10°C is below the optimal temperature, so metabolic processes are slower.
29. (a) To attract flies (pollinators) for pollination. [1]
(b) Method: By animals (or Wind/Water if justified, but Animal is best given the context of flies/fruit). [1] Correction: The question asks about seeds. The passage says "fruit containing thousands of tiny seeds". Usually, small seeds in a fruit are eaten by animals or dispersed by wind if light. Given the "rotting meat" smell attracts flies, but flies don't eat fruit flesh usually. However, standard P5 logic: Juicy/sweet = Animal. Rafflesia fruit is often eaten by pigs/porcupines. Accept "Animals" with reason "eaten by animals". Reason: The seeds are likely small and may be eaten by animals along with the fruit, or the fruit rots and releases seeds. Best Answer: Animals, because the fruit is likely fleshy/attractive to scavengers. [1]
30. (a) Zygote [1]
(b) Through the placenta and umbilical cord. [1]
(c) Harmful substances in smoke/alcohol can pass through the placenta to the foetus. This can cause birth defects, low birth weight, or harm the baby's development. [2] Marking: 1 mark for "substances pass to foetus", 1 mark for "harmful effect/defects".