Complete the sentences to describe and explain the results shown in Table 2.1. As the carbon dioxide concentration increases, the number of gas bubbles released in one minute ............ and then levels off. This happens because carbon dioxide is a ............ material needed for photosynthesis. The number of gas bubbles released stays unchanged between the carbon dioxide concentrations of ............ and ............ arbitrary units. Photosynthesis produces ............ gas which is released as bubbles. The distance between the lamp and the aquatic plant is kept constant during the investigation so that the light ............ stays the same.
Explain the role of the green pigment in plant nutrition.
State the process in plants that releases carbon dioxide.