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Primary 5 Science Weighted Assessment 3 (Term 3) Paper 5
Free P5 Science WA3 Paper 5, Qwen3.7 Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.
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TuitionGoWhere Exam Practice (AI) - Answer Key
Subject: Science
Level: Primary 5
Paper: Weighted Assessment 3 (WA3) - Version 5
Section A (40 marks)
1. (3)
Reasoning: Not all cells have a cell wall. Animal cells do not have cell walls; only plant cells, fungi, and some bacteria do. All living things are made of cells, cells are the basic unit of life, and all cells respire.
2. (3)
Reasoning: Sexual reproduction involves the male parts (Anther B produces pollen) and female parts (Stigma A receives pollen, Ovary C contains ovules). Petals (D) attract pollinators but are not directly involved in the fusion of gametes.
3. (1)
Reasoning: The correct sequence is Pollination (transfer of pollen) → Fertilisation (fusion of gametes) → Seed Dispersal (spreading seeds) → Germination (seed grows into new plant).
4. (4)
Reasoning: X (Testes) produces sperm. Y (Ovaries) produces eggs. Both are reproductive cells. Z (Womb) is where the baby develops, not where fertilisation occurs (fertilisation happens in the oviduct).
5. (1)
Reasoning: Fertilisation is defined as the fusion of a male reproductive cell (sperm) and a female reproductive cell (egg).
6. (3)
Reasoning: Language is a learned characteristic, not an inherited one. Eye colour, hair texture, and skin colour are genetic traits passed from parents.
7. (2)
Reasoning: Wind-dispersed seeds need to be light and often have wing-like or parachute-like structures to catch the wind. Thick layers are for water/animal dispersal.
8. (2)
Reasoning: Seed dispersal reduces overcrowding and competition for water, sunlight, and nutrients between the parent plant and its offspring.
9. (3)
Reasoning: Chickens are birds and lay eggs. Cats, dogs, and humans are mammals that give birth to live young.
10. (4)
Reasoning: Only the adult stage has fully developed reproductive organs and is capable of mating and laying eggs.
11. (3)
Reasoning: Sexual reproduction involves two parents and the fusion of male and female gametes. Asexual reproduction involves one parent and produces identical offspring.
12. (3)
Reasoning: Fertilisation occurs in the ovary, specifically when the pollen tube reaches the ovule.
13. (4)
Reasoning: Seeds do not need sunlight to germinate; they need water, air (oxygen), and suitable temperature. Sunlight is needed for photosynthesis after the seedling emerges.
14. (2)
Reasoning: Asexual reproduction (like stem cuttings) produces clones that are genetically identical to the parent. Sexual reproduction introduces variation.
15. (4)
Reasoning: Females have ovaries which produce egg cells. Males have testes. Egg cells are much larger than sperm cells.
16. (3)
Reasoning: The pollen tube grows down the style to allow the male reproductive cell to travel from the stigma to the ovule for fertilisation.
17. (3)
Reasoning: Whales are mammals and give birth to live young. Frogs, turtles, and eagles lay eggs.
18. (3)
Reasoning: Hooks and spines allow fruits/seeds to attach to the fur of passing animals, aiding in dispersal.
19. (2)
Reasoning: After fertilisation, the ovary develops into the fruit, and the ovule develops into the seed.
20. (2)
Reasoning: Growing from a tuber (potato) is a form of asexual reproduction. Growing from seeds is sexual reproduction.
Section B (60 marks)
21.
(a) Part A: Anther [1]
Part B: Stigma [1]
(b) Pollination is the transfer of pollen grains from the anther to the stigma of a flower. [2]
(c) Seed [1]
Note: The ovule develops into the seed. The ovary develops into the fruit.
22.
(a) Cup Y [1]
(b) Cup Y has both water and air (oxygen) which are necessary for germination. Cup X lacks water, and Cup Z lacks sufficient air because the seeds are submerged. [2]
(c) To ensure a fair test. Only the amount of water should be changed; other variables must be kept constant. [1]
23.
(a) Oviduct (or Fallopian Tube) [1]
(b) To prepare for the implantation of a fertilised egg (embryo). It provides a nourishing environment for the baby to grow. [2]
(c) It breaks down and is released from the body as menstrual blood (menstruation). [1]
24.
(a) Wind [1]
(b) The bright colour and sweet flesh attract animals. Animals eat the fruit and pass the hard seeds out in their droppings elsewhere, aiding dispersal. [2]
(c) Fruit C [1]
Reason: The fibrous, air-filled, and waterproof features allow it to float on water, which is common near seas/rivers. [1]
25.
(a) 3 stages [1]
(b) A cockroach has a 3-stage life cycle (Egg, Nymph, Adult) while a butterfly has a 4-stage life cycle (Egg, Larva, Pupa, Adult). Also, the nymph looks like the adult, whereas the larva (caterpillar) looks very different from the adult butterfly. [2]
(c) The nymph does not have fully developed wings or reproductive organs yet. [1]
26.
(a) To find out if sunlight is needed for plant growth (or photosynthesis). [1]
(b) The plant will turn yellow and become weak/spindly. [1]
(c) Without sunlight, the plant cannot carry out photosynthesis to make food. It also cannot produce chlorophyll, causing it to lose its green colour. [2]
27.
(a) Plant cell [1]
Reason: It has a cell wall (and/or regular shape). Animal cells do not have cell walls. [1]
(b) The nucleus controls the activities of the cell and contains genetic material. [1]
(c) Cell Membrane [1]
28.
(a) Asexual reproduction [1]
(b) It is faster / The new plant will have the same desirable traits as the parent / No need for pollination. [1]
(c) Yes [1]
Explanation: Asexual reproduction produces offspring that are genetically identical to the parent because there is no mixing of genetic material from two parents. [1]
29.
(a) To transport sperm from the testes to the urethra/penis. [1]
(b) The temperature outside the body is lower than inside. Sperm production requires a temperature slightly lower than body temperature to be effective. [2]
30.
Diversity ensures that some individuals in a species may have traits that allow them to survive changes in the environment (e.g., disease, climate change). [1]
If all individuals were identical, a single threat could wipe out the entire species. [1]
Therefore, diversity increases the chance of survival for the species as a whole. [1]