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Primary 6 PSLE Science Semestral Assessment 2 (End of Year) Paper 2
Free P6 PSLE Science SA2 Paper 2, Ox Exam version, with questions, answers, and PSLE-focused practice for Singapore students.
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Answers
Primary 6 PSLE Science Quiz - Diversity — Answer Key
SA2 Practice Paper, Version 2 of 5 — Total: 65 marks
Section A (2 marks each = 10 marks)
1. C — Cotton T-shirt (cotton comes from the cotton plant, which was once alive).
2. C — Response to changes.
3. A — Dolphin (has hair when born, breathes air with lungs through its blowhole, gives birth to live young and feeds them milk).
4. B — Ferns do not bear flowers and reproduce by spores.
5. B — Plants (all plants make their own food by photosynthesis).
Section B (3 marks each = 15 marks)
6.
- Observation 1 (ate seeds every day) → Living things need food/air/water (nutrition).
- Observation 2 (mass increased from 120 g to 165 g) → Living things grow.
- Observation 3 (hid when noise was made) → Living things respond to changes.
(1 mark each)
7.
| Animal | Group | Body covering |
|---|---|---|
| Goldfish | Fish | Wet scales |
| Sparrow | Bird | Feathers |
| Crocodile | Reptile | Dry scales |
| Rabbit | Mammal | Fur/hair |
(Any 3 fully correct rows = 3 marks)
8.
- Natural: wool, leather, silk
- Man-made: glass, plastic, nylon
(3 marks: 1 mark per pair correctly sorted)
9.
- Living: moss, butterfly
- Once alive: wooden stool, paper bag
- Never alive: steel nail, stone
(3 marks: 1 mark per pair correctly sorted)
10. Any two of:
- Mushrooms do not make their own food (no chlorophyll); plants do.
- Mushrooms reproduce by spores, not flowers/seeds like most plants.
- Mushrooms are fungi, a different group from plants.
(1½ marks per correct reason, rounded to 3)
Section C (4 marks each = 20 marks)
11. Correct placement (½ mark each):
- Fish: guppy
- Amphibians: frog
- Reptiles: snake, crocodile
- Birds: eagle
- Mammals: bat
- Insects: butterfly
- Other without-backbone group: prawn
12.
| Feature | Fern | Hibiscus |
|---|---|---|
| Bears flowers | No | Yes |
| Reproduces by spores | Yes | No |
| Makes its own food | Yes | Yes |
| Has roots, stems and leaves | Yes | Yes |
(1 mark each)
13.
- (a) Plastic bag. (1 mark)
- (b) Plastic is waterproof, so the wet towel will not soak through. (1 mark)
- (c) Paper absorbs water and tears easily when wet, so it is unsuitable. (2 marks)
14.
- (a) They are decomposers: they break down dead plants and animals (and waste) into simpler substances, returning nutrients to the environment. (2 marks)
- (b) Example: they decay dead matter into nutrients that enrich the soil for crops; or bacteria are used to decompose sewage/waste in treatment plants. (2 marks)
15.
- Plants: moss, fern, sunflower
- Fungi: toadstool, yeast
- Bacteria: salmonella bacterium
(½ mark per correct organism; 4 marks total with all six placed)
Section D (4 marks each = 20 marks)
16. Any three, explained (marks for reasons + clarity):
- It breathes air through lungs (blowhole), unlike fish which use gills.
- It gives birth to live young instead of laying eggs.
- It feeds its young with milk.
- It has a little hair when born. Award 4th mark for well-written complete sentences linking ideas.
17. Accept any valid yes/no key separating all four, e.g.:
- Does it make its own food?
- Yes → Is it a green plant with flowers? Yes: rose plant. (No-flowering green plant acceptable alternative.)
- No → Can it move from place to place by itself?
- Yes → Does it have feathers? Yes: sparrow; scales/fins: goldfish.
- No → Mushroom. Full credit: every organism reaches one unique endpoint. (4 marks)
18.
- (a) Any two: it cannot grow; it cannot reproduce; it cannot respire/feed on its own; it cannot respond to changes by itself. (2 marks)
- (b) All living things carry out life processes such as growth and reproduction. Since the robot cannot carry out these life processes by itself, it is non-living. (2 marks)
19.
- (a) Any two: same volume of water (50 ml); same size/thickness of cloth pieces; same time soaked (1 minute); same temperature of water. (2 marks)
- (b) Cotton. (1 mark)
- (c) Suitable use: e.g., towel, cleaning cloth, baby wipe — anything needing absorption. (1 mark)
20.
- (a) Classification sorts millions of organisms into groups based on similarities and differences, making it easier to identify, name and study them, and to see relationships between organisms. (2 marks)
- (b) Example: correct classification tells scientists what group a new organism belongs to, so its characteristics, needs and possible uses/harms (e.g., medicine, pest control, conservation) are known immediately. (2 marks)
END OF ANSWER KEY