Question

a student conducts an experiment in which a water plant is exposed to various colors of light. with each color of light, the student monitors the rate of photosynthesis by counting the number of oxygen bubbles produced by the plant. the graph shows the results of the experiment. bar graph: x - axis color of light (violet, blue, green, red); y - axis oxygen bubbles produced per minute what can be inferred from the results of the experiment? options (paraphrased): the calvin cycle functions best with blue light; the light dependent reactions function best with blue light; the light dependent reactions function best with green light; the calvin cycle functions best with green light.

Explanation:

1. Recall photosynthesis: Light - dependent reactions need light, and oxygen is a product. The Calvin cycle (light - independent) doesn't directly depend on light color for oxygen production.
2. Analyze the graph: The number of oxygen bubbles (a measure of photosynthesis rate) is highest for blue light, lowest for green.
3. Evaluate options:

• Option 1: Calvin cycle is light - independent, so oxygen production (from light - dependent) doesn't reflect Calvin cycle efficiency with blue light. Eliminate.
• Option 2: Since blue light gives the most oxygen, light - dependent reactions (which produce oxygen) function best with blue light. This matches.
• Option 3: Green light has the least oxygen, so light - dependent reactions don't function best here. Eliminate.
• Option 4: Calvin cycle is light - independent, and green light has low oxygen (so photosynthesis rate low), so Calvin cycle doesn't function best with green light. Eliminate.

Answer:

The light - dependent reactions function best with blue light (the second option, assuming the options are numbered and the second one is "The light dependent reactions function best with blue light").