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Primary 6 PSLE Science Practice Paper 2

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TuitionGoWhere Practice Paper - Science Primary 6 PSLE (Answer Key)

Subject: Science
Level: Primary 6 PSLE
Paper: Practice Paper 2 (Version 2 of 5)
Total Marks: 100

SECTION A (56 marks)

Question 1

Answer: (3)
Explanation: All living things respond to changes in their surroundings (sensitivity). This is one of the seven life processes.

  • (1) is incorrect: Only plants (producers) make their own food; animals and fungi cannot.
  • (2) is incorrect: Reproduction methods vary (live birth, eggs, spores, budding, binary fission).
  • (4) is incorrect: Some microorganisms (anaerobic bacteria) do not need oxygen.

Question 2

Answer: (1)
Explanation:

  • Group X (mushroom, yeast, mould) → Fungi
  • Group Y (fern, moss, rose plant) → Plants
  • Group Z (lion, eagle, fish) → Animals

Question 3

Answer: (2)
Explanation: The cell has chloroplasts, which are only found in plant cells (and some protists). It also has a cell wall and large central vacuole, confirming it is a plant cell.

  • (1) Animal cells lack chloroplasts and cell walls.
  • (3) Bacterial cells lack a true nucleus and membrane-bound organelles like chloroplasts.
  • (4) Fungal cells have cell walls (made of chitin) but lack chloroplasts.

Question 4

Answer: (2)
Explanation: Yeast is a fungus (microorganism) that reproduces asexually by budding.

  • A: Many microorganisms are beneficial (e.g., yeast in bread, bacteria in yoghurt, decomposers).
  • C: Bacteria can be seen with a light microscope (typically 1000x magnification); electron microscopes are for viruses and detailed internal structures.
  • D: Mould is a fungus, not a bacterium.

Question 5

Answer: (2)
Explanation: Organism Q has a cell wall, reproduces by spores, and feeds on dead/decaying matter (saprotrophic nutrition) — all characteristics of fungi. It lacks chloroplasts, so it is not a plant.

  • P has chloroplasts → plant.
  • R has cell wall only → could be plant or fungus, but no other fungal traits shown.
  • S has no cell wall → animal.

Question 6

Answer: (3)
Explanation: Following the flowchart:

  • Has feathers? No → Has hair/fur? No → Has scales? Yes → Lives in water and breathes through gills? No (breathes through lungs) → Reptile.
    Reptiles have dry scaly skin, lay eggs, and breathe through lungs.

Question 7

Answer: (2)
Explanation: Copper, aluminium, and plastic are all non-magnetic materials. Iron, steel, nickel, and cobalt are magnetic.

Question 8

Answer: (2)
Explanation: A magnet attracts magnetic materials (like steel) at both poles. The paper clip will be attracted to either the N-pole or S-pole. Only like poles repel (N-N or S-S).

Question 9

Answer: (2) or (3)
Explanation: A magnet has two poles and will repel one pole of another magnet while attracting the other.

  • Bar X: Repelled by N-pole, attracted by S-pole → X is a magnet with its N-pole facing the test magnet's N-pole.
  • Bar Y: Attracted by N-pole, repelled by S-pole → Y is a magnet with its S-pole facing the test magnet's N-pole.
    Both X and Y are magnets. (Note: If only one answer allowed, either X or Y is acceptable as "a magnet".)

Question 10

Answer: (1)
Explanation: Magnetic separation uses a magnet to attract magnetic materials from non-magnetic ones. Iron filings are magnetic; sulphur powder is not. The other mixtures contain no magnetic materials.

Question 11

Answer: (1)
Explanation: A raincoat needs to be flexible (to wear), waterproof (to repel rain), and transparent (to see through, e.g., hood). Material A has all three properties.

Question 12

Answer: (1)
Explanation: Volume of stone = Final volume - Initial volume = 72 ml - 50 ml = 22 ml. Since 1 ml = 1 cm³, the volume is 22 cm³.

Question 13

Answer: (2)
Explanation: Freezing is the change of state from liquid to solid (e.g., water to ice).

  • (1) Melting: Solid → Liquid
  • (3) Boiling: Liquid → Gas
  • (4) Condensation: Gas → Liquid

Question 14

Answer: (3)
Explanation: At 30°C (room temperature):

  • P: Melting point -114°C, Boiling point 78°C → 30°C is between -114 and 78 → Liquid
  • Q: Melting point 0°C, Boiling point 100°C → 30°C is between 0 and 100 → Liquid
  • R: Melting point 1538°C → 30°C is below melting point → Solid
  • S: Melting point -39°C, Boiling point 357°C → 30°C is between -39 and 357 → Liquid
    So P, Q, and S are liquids.

Question 15

Answer: (2)
Explanation: Condensation occurs when water vapour loses heat and changes into liquid water droplets (e.g., cloud formation, dew).

  • (1) Evaporation occurs at all temperatures, not only 100°C.
  • (3) Clouds are formed by condensation, not evaporation.
  • (4) Rain is formed when water vapour loses heat (condenses), not gains heat.

Question 16

Answer: (2)
Explanation: The frog eats grasshoppers (predator) and is eaten by snakes (prey).

  • (1) Grass is a producer (makes its own food).
  • (3) Eagle is a top consumer/carnivore.
  • (4) Grasshopper is a primary consumer (herbivore).

Question 17

Answer: (1)
Explanation: Frogs eat grasshoppers. If frogs are removed, the grasshopper population loses a predator and will likely increase. Snakes and hawks (which eat frogs) would decrease. Rabbits are not directly connected to frogs in this web.

Question 18

Answer: (2)
Explanation: Deep roots allow the plant to access water deep underground in arid environments.

  • (1) Broad leaves increase water loss through transpiration.
  • (3) Thin stems store less water; desert plants need thick stems for water storage.
  • (4) Large flowers increase water loss and are not a primary survival adaptation.

Question 19

Answer: (4)
Explanation: All three adaptations reduce heat

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TuitionGoWhere Practice Paper - Science Primary 6 PSLE (Answer Key)

Subject: Science
Level: Primary 6 PSLE
Paper: Practice Paper 2 (Version 2 of 5)
Total Marks: 100

SECTION A (56 marks)

QuestionAnswerExplanation
1(3)All living things respond to changes in their surroundings (sensitivity). Not all make food (only plants), reproduce by laying eggs (mammals give birth), or need oxygen (anaerobic bacteria).
2(1)Group X: mushroom, yeast, mould → Fungi. Group Y: fern, moss, rose plant → Plants. Group Z: lion, eagle, fish → Animals.
3(2)The cell has chloroplasts, cell wall, and large central vacuole → plant cell. Animal cells lack these. Bacterial cells lack nucleus. Fungal cells have cell walls but no chloroplasts.
4(2)Student B: Yeast reproduces by budding (correct). A: Not all microorganisms are harmful. C: Bacteria can be seen with light microscope. D: Mould is fungi, not bacteria.
5(2)Organism Q: Has cell wall, reproduces by spores, feeds on dead/decaying matter, no chloroplasts → fungus. P has chloroplasts (plant). R has cell wall only. S has no cell wall (animal).
6(3)Animal X: lays eggs, dry scaly skin, breathes through lungs → Reptile. Fish have gills. Amphibians have moist skin. Birds have feathers.
7(2)Copper, aluminium, plastic are non-magnetic. Others contain magnetic materials (iron, steel, nickel, cobalt).
8(2)Both poles of a magnet attract magnetic materials (like steel paper clips). Only like poles repel.
9(2) or (3)A magnet shows repulsion with one pole and attraction with the other. Bar X: Repelled by N, attracted by S → X is a magnet with S pole facing N. Bar Y: Attracted by N, repelled by S → Y is a magnet with N pole facing N. Both X and Y are magnets. Note: Question may have intended only one correct answer; typically the bar repelled by one pole is the magnet.
10(1)Magnetic separation separates magnetic from non-magnetic materials. Iron filings (magnetic) and sulphur (non-magnetic). Copper/aluminium both non-magnetic. Sand/salt both non-magnetic. Water/oil are liquids.
11(1)Raincoat needs: flexible (to wear), waterproof (repel rain), transparent (see through - optional but A fits best). B is rigid. C is absorbent. D is rigid.
12(1)Volume of stone = Final volume - Initial volume = 72 ml - 50 ml = 22 ml = 22 cm³ (1 ml = 1 cm³).
13(2)Freezing: Liquid → Solid. Melting: Solid → Liquid. Boiling: Liquid → Gas. Condensation: Gas → Liquid.
14(3)At 30°C: P (-114 to 78) → liquid. Q (0 to 100) → liquid. R (1538 to 2862) → solid. S (-39 to 357) → liquid. So P, Q, S are liquids.
15(2)Condensation occurs when water vapour loses heat and changes to liquid. Evaporation occurs at all temperatures. Clouds form by condensation. Rain forms when water vapour loses heat (condenses).
16(2)Frog eats grasshopper (predator) and is eaten by snake (prey). Grass is producer. Eagle is consumer. Grasshopper is consumer (herbivore).
17(1)Frogs eat grasshoppers. If frogs removed, grasshopper population increases (less predation). Snakes lose food source (decrease). Hawks may decrease. Rabbits unaffected directly.
18(2)Desert plants: deep roots for water, reduced leaves (spines), thick stems for water storage. Broad leaves lose water. Thin stems store less. Large flowers not key for survival.
19(4)All listed adaptations reduce heat loss: thick fur (insulation), fat layer (insulation), small ears (reduce surface area), padded feet (insulation from ice).
20(1)Gills for breathing underwater is a structural (physical) adaptation. Others are behavioural adaptations.
21(2)Plant bending towards light shows sensitivity (response to stimulus). Phototropism.
22(2)Chameleon changing colour is a behavioural adaptation (action). Others are structural (physical features).
23(2)Larva (caterpillar) stage feeds voraciously on leaves, causing crop damage. Egg, pupa, adult do not eat crops significantly.
24(2)Respiration releases energy from food. Photosynthesis stores energy. Transpiration is water loss. Germination uses stored energy.
25(2)Plant B (in dark) is the control to show light is needed for photosynthesis (starch only in Plant A).
26(2)Photosynthesis: CO₂ + H₂O → glucose + O₂. Oxygen is produced.
27(3)Gaseous exchange occurs in alveoli (air sacs) where O₂ and CO₂ diffuse between air and blood.
28(2)During respiration: O₂ used (21% → 16%), CO₂ produced (0.04% → 4%). N₂ unchanged. Water vapour increases.

SECTION B (44 marks)

Question 29

(a) [2 marks]

  • Organism A: Fungi
  • Organism B: Plants
  • Organism C: Animals

(b) [1 mark]

  • Organism A (mushroom) feeds on dead/decaying matter (saprotrophic nutrition) / reproduces by spores / has no chloroplasts/cannot photosynthesise / body made of hyphae/mycelium. (Any one valid difference from plants)

(c) [1 mark]

  • Both are living things / made of cells / need air, food, water / reproduce / respond to changes / grow. (Any one valid similarity between plants and animals)

Question 30

(a) [1 mark]

  • Animal cell

(b) [1 mark]

  • It has no cell wall / no chloroplasts / no large central vacuole. (Any one correct absence of plant cell feature)

Question 31

(a) [1 mark]

  • Repulsion / The magnets repel each other.

(b) [1 mark]

  • Like poles (N-N or S-S) face each other and like poles repel.

(c) [1 mark]

  • Turn one magnet around so that unlike poles (N-S) face each other / Flip one magnet.

Question 32

(a) [1 mark]

  • 20 cm³ (50 cm³ - 30 cm³ = 20 cm³)

(b) [1 mark]

  • The stone has a fixed volume and displaces its own volume of water. / Volume of stone = volume of water displaced.

(c) [1 mark]

  • The water level will remain the same / stay at 50 cm³. (Cork floats, displaces only its weight, not full volume; or if pushed down, but question implies just placed)

Question 33

(a) [1 mark]

  • Solid → Liquid / Melting

(b) [1 mark]

  • The ice cream gains heat from the warmer surroundings.

(c) [1 mark]

  • Condensation / Water vapour in the surrounding air loses heat to the cold cup and condenses into water droplets.

Question 34

(a) [1 mark]

  • Water cycle / The continuous movement of water on, above, and below the surface of the Earth.

(b) [2 marks]

  • Evaporation: Water from seas/rivers gains heat from Sun, changes to water vapour, rises.
  • Condensation: Water vapour rises, loses heat to cooler air at higher altitude, condenses into tiny water droplets forming clouds.
  • Precipitation: Droplets merge, become heavy, fall as rain.
  • Collection: Rain flows back to rivers/seas. (Any 2 correct processes in order for 2 marks)

(c) [1 mark]

  • The Sun / Heat from the Sun.

Question 35

(a) [1 mark]

  • Producer / Food producer / Makes its own food via photosynthesis.

(b) [1 mark]

  • Energy is lost as heat / waste / uneaten parts at each trophic level / Only about 10% energy transferred / Not all organisms are eaten. (Any valid reason)

(c) [1 mark]

  • Population of deer will increase (less predation) → Population of grass will decrease (more deer eating grass). OR Tiger population may decrease (less food). (Any one valid effect)

Question 36

(a) [1 mark]

  • Camouflage / Blends with surroundings to hide from predators/prey.

(b) [1 mark]

  • Structural adaptation (physical feature: colour/pattern of fur).

(c) [1 mark]

  • Behavioural adaptation: Arctic fox hunts at night / migrates / curls up to sleep. (Any valid behavioural adaptation)

Question 37

(a) [1 mark]

  • Larva / Caterpillar / Mealworm larva

(b) [1 mark]

  • Pupa / Mealworm pupa

(c) [1 mark]

  • Complete metamorphosis / Holometabolism (4 stages: egg, larva, pupa, adult).

(d) [1 mark]

  • Larva (feeds and grows rapidly, moults several times).

Question 38

(a) [1 mark]

  • To take in oxygen and give out carbon dioxide / Gaseous exchange.

(b) [1 mark]

  • Oxygen is transported by blood to all cells for respiration to release energy.

(c) [1 mark]

  • Diaphragm moves down / contracts, ribs move up and out → chest volume increases → air pressure in lungs decreases → air rushes in. (Key points: diaphragm down, volume up, pressure down, air in)

(d) [1 mark]

  • Exhaled air has more carbon dioxide / less oxygen / more water vapour / warmer. (Any one correct difference)

Question 39

(a) [1 mark]

  • Light energy → Chemical energy (in food/starch) / Light energy → Chemical potential energy.

(b) [1 mark]

  • Chlorophyll / Chloroplasts (contain chlorophyll).

(c) [1 mark]

  • Carbon dioxide + Water → (Light + Chlorophyll) → Glucose + Oxygen / 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.

(d) [1 mark]

  • Destarch the plant / Remove existing starch / Ensure any starch found later is made during experiment.

Question 40

(a) [1 mark]

  • C (Copper - best conductor among options, or if table given: material with highest thermal conductivity)

(b) [1 mark]

  • Metal is a good conductor of heat / Heat from hot water travels quickly through metal handle to hand / Handle becomes too hot to hold.

(c) [1 mark]

  • Plastic / Wood / Rubber (Any poor conductor/insulator).

(d) [1 mark]

  • Poor conductor of heat / Insulator / Does not conduct heat well / Heat from hot water does not travel easily to handle.

END OF ANSWER KEY