PSLE Science Exam All Questions and Answers (2024-2025)
100% A+ Graded
1. Respiratory System - ANSWER- Absorbs oxygen, releases carbon dioxide in blood.
2. Circulatory System - ANSWER- Transports oxygen and carbon dioxide in blood.
3. Small Intestine - ANSWER- Absorbs sugar into blood for energy.
4. Large Intestine - ANSWER- Absorbs water and mineral salts from undigested food.
5. Experimental Reliability - ANSWER- Repeat experiments and average results for accuracy.
6. Temperature Definition - ANSWER- Measurement of how hot or cold an object is.
7. Sound Level - ANSWER- Not zero due to surrounding sound capture.
8. Volume Measurement - ANSWER- Use water displacement to find object's volume.
9. Coin Bank Volume - ANSWER- Coins cannot fit due to air spaces.
10. Forces on Rocket - ANSWER- Gravitational and frictional forces act during ascent.
11. Bacteria Effectiveness - ANSWER- Liquid T less effective than soap in killing bacteria.
12. Water Movement Measurement - ANSWER- Time for stain to travel in xylem at temperatures.
13. Stomata Function - ANSWER- Increases size for faster gas exchange in plants.
14. Sound Production - ANSWER- Hammer strikes bell due to on/off switch action.
15. Stronger Spring Effect - ANSWER- Softer sound due to slower hammer movement.
16. Elastic Potential Energy - ANSWER- Converted to other energy forms as toy flies.
17. Air Properties - ANSWER- Air occupies space and can be compressed.
18. Jogging Blood Transport - ANSWER- Increased blood flow for energy and waste removal.
19. Digested Food Absorption - ANSWER- Less blood to digestive system during jogging.
20. Reliable Results - ANSWER- Repeated measurements show smaller differences.
, 21. Living Things Response - ANSWER- Organisms react to environmental changes.
22. Propeller Experiment Variation - ANSWER- Uncontrolled water changes affect distance
moved.
23. Oil Solidification - ANSWER- Pipe temperature lower than oil's freezing point.
24. Short Circuit - ANSWER- Extra wires in a circuit cause malfunction.
25. Boiling Definition - ANSWER- Liquid to gas change at fixed temperature.
26. Heat Conduction - ANSWER- Glass poor conductor; part A heats faster.
27. Glass Cracking - ANSWER- Uneven heating causes expansion and cracking.
28. Seed Dispersal - ANSWER- Prevents overcrowding and competition with parent plant.
29. Photosynthesis - ANSWER- To ensure that plant X completes the process of photosynthesis.
30. Food formation in plants - ANSWER- During photosynthesis, chlorophyll in the leaves trap
sunlight to convert carbon dioxide and water into food and oxygen.
31. Frictional force and rubber strips - ANSWER- The rubber strips increase the amount of
frictional force between the claw-like arms and the ball.
32. Heat loss comparison - ANSWER- Block B loses heat faster to the cooler water droplets than
to the surrounding air.
33. Spring compression effect - ANSWER- The tennis ball will move higher than the original
height. Spring B is compressed more than spring A when the same amount of mass was placed
on them.
34. Bottle sinking reason - ANSWER- Air inside the bottle escaped from hole A so water can enter
hole B to occupy the space previously occupied by the escaped air.
100% A+ Graded
1. Respiratory System - ANSWER- Absorbs oxygen, releases carbon dioxide in blood.
2. Circulatory System - ANSWER- Transports oxygen and carbon dioxide in blood.
3. Small Intestine - ANSWER- Absorbs sugar into blood for energy.
4. Large Intestine - ANSWER- Absorbs water and mineral salts from undigested food.
5. Experimental Reliability - ANSWER- Repeat experiments and average results for accuracy.
6. Temperature Definition - ANSWER- Measurement of how hot or cold an object is.
7. Sound Level - ANSWER- Not zero due to surrounding sound capture.
8. Volume Measurement - ANSWER- Use water displacement to find object's volume.
9. Coin Bank Volume - ANSWER- Coins cannot fit due to air spaces.
10. Forces on Rocket - ANSWER- Gravitational and frictional forces act during ascent.
11. Bacteria Effectiveness - ANSWER- Liquid T less effective than soap in killing bacteria.
12. Water Movement Measurement - ANSWER- Time for stain to travel in xylem at temperatures.
13. Stomata Function - ANSWER- Increases size for faster gas exchange in plants.
14. Sound Production - ANSWER- Hammer strikes bell due to on/off switch action.
15. Stronger Spring Effect - ANSWER- Softer sound due to slower hammer movement.
16. Elastic Potential Energy - ANSWER- Converted to other energy forms as toy flies.
17. Air Properties - ANSWER- Air occupies space and can be compressed.
18. Jogging Blood Transport - ANSWER- Increased blood flow for energy and waste removal.
19. Digested Food Absorption - ANSWER- Less blood to digestive system during jogging.
20. Reliable Results - ANSWER- Repeated measurements show smaller differences.
, 21. Living Things Response - ANSWER- Organisms react to environmental changes.
22. Propeller Experiment Variation - ANSWER- Uncontrolled water changes affect distance
moved.
23. Oil Solidification - ANSWER- Pipe temperature lower than oil's freezing point.
24. Short Circuit - ANSWER- Extra wires in a circuit cause malfunction.
25. Boiling Definition - ANSWER- Liquid to gas change at fixed temperature.
26. Heat Conduction - ANSWER- Glass poor conductor; part A heats faster.
27. Glass Cracking - ANSWER- Uneven heating causes expansion and cracking.
28. Seed Dispersal - ANSWER- Prevents overcrowding and competition with parent plant.
29. Photosynthesis - ANSWER- To ensure that plant X completes the process of photosynthesis.
30. Food formation in plants - ANSWER- During photosynthesis, chlorophyll in the leaves trap
sunlight to convert carbon dioxide and water into food and oxygen.
31. Frictional force and rubber strips - ANSWER- The rubber strips increase the amount of
frictional force between the claw-like arms and the ball.
32. Heat loss comparison - ANSWER- Block B loses heat faster to the cooler water droplets than
to the surrounding air.
33. Spring compression effect - ANSWER- The tennis ball will move higher than the original
height. Spring B is compressed more than spring A when the same amount of mass was placed
on them.
34. Bottle sinking reason - ANSWER- Air inside the bottle escaped from hole A so water can enter
hole B to occupy the space previously occupied by the escaped air.
