Transpiration drives faster water uptake in warm, windy conditions

Steps:

• Transpiration rate increases with temperature, as higher heat boosts evaporation from leaves.
• Wind from the fan enhances evaporation by removing the boundary layer of humid air around leaves.
• Colored water rises via xylem due to transpiration pull; faster pull means quicker uptake.
• Combine highest temperature and wind for maximum rate.

Why D is correct:

• At 30°C with a fan, transpiration is maximized per the transpiration rate formula influenced by temperature and wind speed, accelerating water movement to leaves fastest.

Why the others are wrong:

• A: Low 10°C slows evaporation, reducing transpiration pull.
• B: Fan helps but 10°C limits overall evaporation rate.
• C: 30°C boosts rate but lacks fan's wind to further increase evaporation.

Final answer: D