(a) Refraction. (b) Light bends when it passes from water to air (different densities).
A factory releases hot waste water into a river. Algae in the river grow rapidly. 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) Refraction
(a) Name one structure seen in the onion cell but not in the cheek cell. (b) What is the function of the nucleus? psle 2012 science questions and answers