Biology Past Questions and Answers

An onion is a bulb because it

The flow of air and water in or out of the mesophyll layer of a leaf is controlled by the

Fungi are heterotropic because they

The major site of photosynthesis in the leaf is the

5 cm[sup]3[/sup] dilute sodium hydroxide solution and 5 cm[sup]3[/sup] one percent copper sulphate solution are added to a solution of food specimen. The purple colour which is observed shows the presence of