A student looks at a pencil in a glass of water. The pencil appears broken at the water surface.
(a) What happens to some of the energy after the ball hits the ground? (b) Name the main type of energy the ball has just before it hits the ground.
C) Cell wall Explanation: Plant cells have a rigid cell wall outside the cell membrane for support; animal cells do not.
(a) Which pole of magnet Y is facing magnet X? (b) State the rule you used. psle 2012 science questions and answers
(a) Leaf in sunlight → starch present (blue-black with iodine). Leaf in dark → no starch (brown iodine). (b) To make it a fair test – temperature affects rate of photosynthesis. End of PSLE 2012 Science Paper (Reconstructed) Note to students: PSLE Science questions test application of concepts, not just memorisation. Practice explaining your answers clearly using scientific keywords.
(a) What is the role of the grass in this food web? (b) If all frogs are removed, explain what will happen to the grasshopper population.
(a) North pole. (b) Like poles repel.
A mango seed is planted in a pot with soil. It is watered regularly but kept in a dark cupboard. After 2 weeks, the seed sprouts but has yellow leaves.
(a) Small intestine. (b) Absorbs water and minerals; stores undigested waste.
(a) Producer. (b) Grasshopper population will increase initially because there are no frogs to eat them. A student looks at a pencil in a glass of water
(Questions 4–28 omitted here for brevity; structure continues similarly.) Question 29 (Adapted from 2012) A fish tank contains 5 fish, some aquatic plants, and a filter. The tank is covered and placed near a window.
(a) Stores water. (b) Reduces water loss (less surface area for transpiration) and protects from herbivores.
Water from a pond dries up after a few hot days. (b) Name the main type of energy the