Psle 2012 Science Questions And Answers -

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.

A cheek cell and an onion cell are observed. psle 2012 science questions and answers

A student places a magnet near a compass. The compass needle moves. Which force is responsible? A) Frictional force B) Gravitational force C) Magnetic force D) Elastic spring force A pupil wants to test if light is needed for photosynthesis

(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 cheek cell and an onion cell are observed

(a) Complete metamorphosis. (b) Larva lives in water, breathes through siphon tube; adult flies, breathes through spiracles. (Or: Larva does not have wings; adult has wings.)

(a) Name one structure seen in the onion cell but not in the cheek cell. (b) What is the function of the nucleus?

(a) Why are the leaves yellow? (b) What does the seedling use for energy before it produces green leaves?