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Primary 4 Science Life Cycles Quiz
Free P4 Science Life Cycles quiz, AI version, with questions, answers, and syllabus-aligned practice for Singapore students.
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Primary 4 Science - Life Cycles Quiz 01 - Answer Key
Section A: Multiple Choice Questions (1 mark each)
1. C) Seed
The seed develops from the fertilised egg cell (ovule).
2. A) Transfer of pollen from stamen to pistil
Pollination is the transfer of pollen grains from the anther to the stigma.
3. C) Pollination
Pollination is not a method of seed dispersal; it is the transfer of pollen.
4. B) Pistil
The pistil (female part) contains the ovary where ovules are found.
5. D) Light
Seeds need water, warmth, and air to germinate, but not light.
Section B: Short Answer Questions (2 marks each)
6. Male part: Stamen (consisting of anther and filament)
Female part: Pistil (consisting of stigma, style, and ovary)
Award 1 mark for each correct part.
7. During fertilisation, the male cell (in pollen) joins with the female cell (egg cell/ovule) in the ovary to form a seed.
Award 2 marks for explaining the joining of male and female cells.
8. Methods of pollination:
- Wind pollination (e.g., grass, wheat, corn)
- Insect/animal pollination (e.g., hibiscus, rose, sunflower)
Award 1 mark for each correct method with example.
9. Flowering plants reproduce through seeds formed after pollination and fertilisation. Non-flowering plants like ferns reproduce through spores, not seeds, and do not have flowers.
Award 2 marks for correct comparison.
10. Any two of:
- Light weight
- Wings (like maple seeds)
- Fluffy/feathery structures (like dandelion)
- Small size
Award 1 mark for each correct adaptation.
Section C: Application Questions (2 marks each)
11. Possible reasons:
- Lack of pollinators (bees, insects) to transfer pollen
- Poor pollination due to weather conditions
- Flowers may not be receiving enough nutrients
Award 2 marks for identifying pollination problem.
12. Seeds with hooks or sticky surfaces are adapted for dispersal by animals. The hooks or sticky surfaces attach to the fur or feathers of animals, which carry the seeds to new locations.
Award 2 marks for explaining animal dispersal mechanism.
13. Not all seeds will survive to become plants because:
- Some may not land in suitable places
- Some may be eaten by animals
- Some may not have the right conditions for germination
- Some may rot or be destroyed
Award 2 marks for explaining survival challenges.
14. The coconut can float on water because it has a fibrous outer layer that traps air. This allows it to float across rivers and oceans to reach new locations where it can germinate and grow.
Award 2 marks for explaining water dispersal.
15. Dandelion seeds are light and fluffy so they can be easily carried by the wind over long distances. The fluffy parachute-like structure increases air resistance, allowing the seed to stay airborne longer.
Award 2 marks for explaining wind dispersal adaptation.
Marking Scheme Summary
- Section A: 5 marks (5 questions × 1 mark)
- Section B: 10 marks (5 questions × 2 marks)
- Section C: 10 marks (5 questions × 2 marks)
- Total: 25 marks
End of Answer Key