Psle 2012 Science Questions And Answers -

(a) What is this rapid growth of algae called? (b) Explain how this affects fish in the river.

(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 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. psle 2012 science questions and answers

(a) Name this phenomenon. (b) What causes it?

A student looks at a pencil in a glass of water. The pencil appears broken at the water surface. (a) What is this rapid growth of algae called

(a) What process do the plants carry out during the day that benefits the fish? (b) What gas do the fish release that is used by the plants?

(a) Why are the leaves yellow? (b) What does the seedling use for energy before it produces green leaves? (b) If all frogs are removed, explain what

(a) Is this complete or incomplete metamorphosis? (b) Name one difference between the larva and adult stages.

(a) What is the expected result? (b) Why is it necessary to keep both plants in the same temperature?