Plants produce maximum growth when exposed to a day temperature that is

Plants produce maximum growth when exposed to a day temperature that is

• A. The same as the night temperature
• B. 5-10 degrees F lower than the night temperature
• C. 50 degrees F
• D. 10 - 15 degrees F higher than the night temperature

Answer: (D)

Maximum growth occurs when the day is warmer than the night. During the day, light fuels photosynthesis, and warmer daytime temperatures boost the enzymes that drive growth, helping plants convert more light into sugars. At night, photosynthesis stops and cooler conditions help limit respiration, so keeping nights cooler supports efficient energy use and storage. A day temperature about 10–15°F higher than the night is a practical target that drives strong daytime production without risking heat stress during the hottest hours. If day and night are the same, you miss out on the extra photosynthetic production; if the day is cooler than the night, growth slows because daytime photosynthesis is not optimized. A fixed 50°F difference isn’t appropriate for most plants and wouldn’t fit their normal tolerance ranges.

Maximum growth occurs when the day is warmer than the night. During the day, light fuels photosynthesis, and warmer daytime temperatures boost the enzymes that drive growth, helping plants convert more light into sugars. At night, photosynthesis stops and cooler conditions help limit respiration, so keeping nights cooler supports efficient energy use and storage. A day temperature about 10–15°F higher than the night is a practical target that drives strong daytime production without risking heat stress during the hottest hours. If day and night are the same, you miss out on the extra photosynthetic production; if the day is cooler than the night, growth slows because daytime photosynthesis is not optimized. A fixed 50°F difference isn’t appropriate for most plants and wouldn’t fit their normal tolerance ranges.