Question

5.g - unit c: photosynthesis and cellular respiration exam possible points: 4.17 what is occurring according to the graph during the light intensity area labeled c? carbon dioxide utilization rate of plant 1 is decreasing. light intensity for both plants is decreasing. glucose production rate for plant 2 is increasing. oxygen production rate for both plants is increasing.

Explanation:

To solve this, we analyze each option:

• Option 1 (Carbon dioxide utilization rate of Plant 1 decreasing): In light intensity area C (assuming it's the saturation or decline phase for some plants), if light intensity is such that Plant 1’s CO₂ use (photosynthesis) drops, but this isn’t universal.
• Option 2 (Light intensity for both plants decreasing): The question is about what’s occurring during light intensity area C—usually, after light saturation, light intensity doesn’t decrease here; this is incorrect.
• Option 3 (Glucose production rate for Plant 2 increasing): If Plant 2 is still in the phase where light intensity increases photosynthesis (e.g., not saturated yet in area C), its glucose (product of photosynthesis) production would rise with light (or related factors in area C). This aligns with photosynthesis dynamics: as light (or CO₂, etc.) supports more reactions, glucose production increases.
• Option 4 (Oxygen production rate for both plants increasing): If one plant is saturated or declining, O₂ (byproduct of photosynthesis) might not increase for both. So this is less likely.

Answer:

C. Glucose production rate for Plant 2 is increasing