Question

trial light color setting (nm) light intensity setting (w) carbon dioxide levels (ppm) record oxygen levels (ml/hour) for each trial did the rate of oxygen increase or decrease from the control level? 31.3 ml/hour 1 white (all colors) 50 500 31.3 experiment ii: change carbon dioxide levels 2 white 50 0 3 white 50 100 4 white 50 300 4. what is the role of carbon dioxide in photosynthesis? 5. how might changing the amount of carbon dioxide available to a plant affect the rate of photosynthesis? 6. if the amount of carbon dioxide available to the plant approaches zero, what will happen to the plants rate of photosynthesis?

Explanation:

Carbon dioxide is a reactant in photosynthesis. The chemical equation for photosynthesis is \(6CO_2 + 6H_2O
ightarrow C_6H_{12}O_6+6O_2\). As the amount of carbon dioxide increases (up to a certain point), the rate of photosynthesis can increase because there is more of a key reactant available. If the amount of carbon dioxide approaches zero, the rate of photosynthesis will decrease towards zero because there is insufficient reactant for the reaction \(6CO_2 + 6H_2O
ightarrow C_6H_{12}O_6+6O_2\) to occur.

Answer:

1. Carbon dioxide is a reactant in photosynthesis.
2. Increasing the amount of carbon dioxide (up to a point) can increase the rate of photosynthesis; decreasing it can decrease the rate.
3. The plant's rate of photosynthesis will decrease towards zero.