What is the most logical reason that the carbon dioxide level went down during the middle of the day? Use the graph to help you decide. It will also be helpful to think about what you have learned in previous units.

Question

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Responses

The carbon dioxide level decreases in the middle of the day because the temperature suddenly drops and stays below the freezing point.
The carbon dioxide level decreases in the middle of the day because the temperature suddenly drops and stays below the freezing point.

The carbon dioxide level decreases in the middle of the day because the light level goes up, which allows the plants in the greenhouse to perform photosynthesis and remove carbon dioxide from the air.
The carbon dioxide level decreases in the middle of the day because the light level goes up, which allows the plants in the greenhouse to perform photosynthesis and remove carbon dioxide from the air.

The carbon dioxide level decreases in the middle of the day because there is no light in the greenhouse, so photosynthesis can't be performed.
The carbon dioxide level decreases in the middle of the day because there is no light in the greenhouse, so photosynthesis can't be performed.

The carbon dioxide level decreases in the middle of the day because the greenhouse was flooded with steadily increasing levels of water.
The carbon dioxide level decreases in the middle of the day because the greenhouse was flooded with steadily increasing levels of water.
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Answer 1

The most logical reason that the carbon dioxide level went down during the middle of the day is because the light level goes up, allowing the plants in the greenhouse to perform photosynthesis and remove carbon dioxide from the air. This is supported by the graph showing a decrease in CO2 levels during the daytime. In previous units, it is also learned that plants use carbon dioxide during photosynthesis to produce oxygen and carbohydrates, which would lead to a decrease in carbon dioxide levels when plants are actively photosynthesizing.