Question

multiple select question
select all that apply
which of the following can be concluded based on this diagram showing the change in the rate of photosynthesis as a function of the intensity of light under varying conditions?
□ regardless of the concentration of carbon dioxide, when light intensity is increased from 2000 foot - candles to 2500 foot - candles, the rate of photosynthesis remains unchanged
□ at all temperatures, the rate of photosynthesis remains constant at all light intensities.
□ regardless of the ambient temperature, increasing light intensity always results in an increase in photosynthetic rate.
□ at light intensities greater than 1500 foot - candles, higher temperature results in higher photosynthetic rate

Explanation:

1. Analyze the first option: Looking at the graph, for different carbon - dioxide conditions, when light intensity changes from 2000 to 2500 foot - candles, the rate of photosynthesis curves are horizontal in that range, meaning the rate remains unchanged.
2. Analyze the second option: The graph shows that the rate of photosynthesis varies with light intensity at different temperatures, so it is not constant at all light intensities for all temperatures.
3. Analyze the third option: At high light intensities, the curves level off, indicating that increasing light intensity does not always result in an increase in the photosynthetic rate.
4. Analyze the fourth option: For light intensities greater than 1500 foot - candles, the curve for 35°C is higher than the curve for 20°C under excess CO₂ conditions, showing that higher temperature results in a higher photosynthetic rate.

Answer:

A. Regardless of the concentration of carbon dioxide, when light intensity is increased from 2000 foot - candles to 2500 foot - candles, the rate of photosynthesis remains unchanged
D. At light intensities greater than 1500 foot - candles, higher temperature results in higher photosynthetic rate