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Primary 6 PSLE Science Practice Paper 2
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TuitionGoWhere Practice Paper - Answer Key
Science Primary 6 PSLE — Topic Quiz: Diversity (Version 2 of 5)
Total Marks: 70
Section A: Multiple-Choice Questions (2 marks each)
| Q | Answer | Explanation |
|---|---|---|
| 1 | (3) | Mammals have hair and their young feed on mother's milk; dolphins do this despite living in water. |
| 2 | (2) | Ferns reproduce by spores and do not bear flowers. |
| 3 | (2) | A waterproof material prevents water from passing through, keeping the user dry. |
| 4 | (2) | Yeast is a single-celled fungus; moss is a plant, amoeba/spirogyra are other microorganisms. |
| 5 | (3) | All birds have beaks; not all birds fly (e.g., penguin), have hollow bones, or webbed feet. |
| 6 | (2) | Responding to changes (sensitivity) is a life process shown only by living things. |
| 7 | (2) | Glass lets light through (transparent) and is hard, suiting window panes. |
| 8 | (2) | Both bacteria and mould are microorganisms (too small to see without magnification). |
| 9 | (3) | Fish use gills to take in oxygen dissolved in water. |
| 10 | (1) | Metal conducts heat well, allowing food to cook evenly. |
Section A subtotal: 20 marks
Section B: Open-Ended Questions (5 marks each)
11. (a) Mammals: bat; Fish: shark; Reptiles: crocodile; Amphibians: frog. [3 × 1] (b) Both live in water / both have streamlined bodies suited for swimming. [2]
12. Any two differences:
- Cat gives birth to live young; chicken lays eggs. [2–3]
- Cat's young feed on milk; chicks do not (they peck at food).
- Cat's young develop inside the mother's body; chicks develop inside eggs outside the mother. [total 5]
13. Plastic is waterproof, so it keeps rain out; cotton absorbs water, so the wearer would get wet. Plastic also dries quickly and does not soak through. [5]
14. (a) A fern reproduces by spores found on the underside of its leaves. [2] (b) Pine tree / moss / liverwort (any one). [1] (c) A fern is a plant (makes its own food, has chlorophyll); a mushroom is a fungus (cannot make its own food, feeds on decaying matter). [2]
15. (a) Yeast respires on the sugar in the dough, producing carbon dioxide gas. The trapped gas bubbles cause the dough to rise. [3] (b) Useful: yeast in baking bread / making wine; mould used to make cheese or medicine (penicillin). Harmful: mould spoils food; some fungi cause diseases like athlete's foot. [2]
16. Any suitable property per object:
- Rubber band: elastic/flexible — can stretch and return to original shape.
- Glass window pane: transparent — allows light through so we can see out.
- Metal spoon: strong/hard and does not break easily — can scoop food; conducts heat.
- Paper tissue: soft and absorbent — gentle on skin and soaks up moisture. [5 × 1]
17. (a) Decomposers (bacteria and fungi). [1] (b) They break down dead organisms and waste into simpler substances, returning nutrients to the soil for plants to use. [2] (c) Warmth, moisture/moist conditions, air/oxygen, and food/nutrients (any two). [2]
18. (a) Six legs; three body parts (head, thorax, abdomen); one pair of antennae (any two). [2] (b) A spider has eight legs (and two body parts), so it is not an insect. [1] (c) Head, thorax, abdomen. [2]
19. (a) The type of material (cotton, wool, silk). [1] (b) Size/thickness of each piece; amount/volume of water; time soaked (any two). [2] (c) Weigh each piece before and after soaking (or measure the amount of water left), then compare the increase in mass/water absorbed for each material. [2]
20. (a) Amphibian. [1] (b) Any two: it grows legs (hind then front legs); its tail shortens/disappears; its gills are replaced by lungs; its mouth widens. [2] (c) Both are vertebrates / both lay eggs / both have backbones / both are cold-blooded. [2]
Section B subtotal: 50 marks
Marking Notes
- For Section B, award full marks only where the required number of points is given correctly.
- Accept scientifically equivalent wording; do not penalise minor spelling errors if meaning is clear.
- Answers stating "both live in water" for Q11(b) are acceptable since both the shark and dolphin live in the sea.
— END OF ANSWER KEY —