A ball is dropped from a height of 2 metres. It bounces back to 1 metre.
(a) Producer. (b) Grasshopper population will increase initially because there are no frogs to eat them.
(a) It has become a temporary magnet. (b) Magnetisation by stroking.
(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. psle 2012 science questions and answers
A group of pupils placed a wet cloth over the top of a potted plant for 24 hours. After that, they saw water droplets on the inside of the cloth.
(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 cheek cell and an onion cell are observed. A ball is dropped from a height of 2 metres
(a) Circuit B. (b) Two batteries in series provide a higher voltage, increasing the current and brightness.
A student builds two circuits. Circuit A has one bulb and one battery. Circuit B has the same bulb but two batteries connected in series.
The diagram shows the human digestive system (labelled parts: mouth, oesophagus, stomach, small intestine, large intestine). she tests both leaves for starch.
(a) Converted to heat and sound energy. (b) Kinetic energy.
A pupil wants to test if light is needed for photosynthesis. She uses two potted plants, one in sunlight and one in a dark cupboard. After 48 hours, she tests both leaves for starch.
The diagram shows a food web: Grass → Grasshopper → Frog → Snake → Eagle