1. Biology GCE O ’ Level Revision program

2. Cells and Osmosis:

3. Turgid Plants are erect, while flaccid ones wilt

5. “Active Transport” “The movement of particle from an area of lower concentration to an area of higher concentration by using energy.”  Active transport is involved in a number of processes occurring within an organism  This includes the absorption of:  Dissolved mineral salts by the root hairs,  Glucose and amino acids by cells in the small intestine of humans by villi Fig. 2.4 Active transport-molecules diffuse against the concentration gradient from B to A.