Question

use the photosynthesis interactive to answer the question. suppose that you conduct an experiment to determine how photosynthetic output, measured in oxygen (o₂) production, changes as you alter photosynthesis, and generate the graph. identify which manipulations to photosynthesis generated the observed changes in o₂ production depicted in the graph.

Explanation:

Step1: Recall photosynthesis factors

Photosynthesis is affected by light, temperature, and gas concentrations.

Step2: Analyze each factor

• High - temperature: Can denature enzymes involved in photosynthesis, usually reducing photosynthetic output over time but might initially increase it slightly.
• Green light: Plants reflect green light and absorb other wavelengths more efficiently for photosynthesis, so green light can reduce photosynthetic output.
• High CO₂: CO₂ is a reactant in photosynthesis. An increase in CO₂ can enhance the rate of photosynthesis and thus increase O₂ production.
• High O₂: High O₂ can lead to photorespiration in some plants, which reduces the efficiency of photosynthesis and decreases O₂ production.

Step3: Match with graph

The bar higher than normal conditions is likely due to high CO₂ as it promotes photosynthesis and O₂ production. The bars lower than normal could be due to green light (less absorbed for photosynthesis) and high O₂ (photorespiration). High - temperature effects are more complex and not clearly indicated here.

Answer:

The manipulation that increased O₂ production (the taller bar compared to normal) is high CO₂. The manipulations that decreased O₂ production (the shorter bars compared to normal) are green light and high O₂.