Dependant variable: the number of oxygen bubbles given off (the rate of photosynthesis). Controlled variables: the size of the pondweed, the volume of water used and its temperature. Below are a ...

Photosynthesis, it's just a chemical reaction ... Ask students to label a diagram of a plant cell and review their functions. Students could then count the numbers of bubbles of oxygen produced ...

A diagram showing changes in the spatial structure of chloroplast membranes during the transition from darkness (top) to ...