Transpiration rate is influenced by which set of factors?

Transpiration rate is influenced by which set of factors?

• A. Leaf color
• B. Temperature, Light, Humidity, Wind
• C. Soil moisture and temperature
• D. Soil pH

Answer: (B)

Transpiration rate is driven by the movement of water vapor from the leaf to the surrounding air, which depends on how open the stomata are and the water vapor gradient between inside the leaf and the air. The main environmental factors shaping this are temperature, light, humidity, and wind. Warmer air increases the capacity to hold water vapor and speeds diffusion, so transpiration rises with temperature. Light signals stomata to open for photosynthesis, increasing water loss. Low humidity makes the surrounding air drier relative to the leaf interior, widening the vapor-pressure gradient and speeding transpiration, while high humidity slows it. Wind removes water vapor from around the leaf, reducing the boundary layer and allowing faster diffusion, boosting transpiration. Leaf color and soil pH don’t directly control transpiration, though soil moisture can influence stomatal opening indirectly by signaling water availability.

Transpiration rate is driven by the movement of water vapor from the leaf to the surrounding air, which depends on how open the stomata are and the water vapor gradient between inside the leaf and the air. The main environmental factors shaping this are temperature, light, humidity, and wind. Warmer air increases the capacity to hold water vapor and speeds diffusion, so transpiration rises with temperature. Light signals stomata to open for photosynthesis, increasing water loss. Low humidity makes the surrounding air drier relative to the leaf interior, widening the vapor-pressure gradient and speeding transpiration, while high humidity slows it. Wind removes water vapor from around the leaf, reducing the boundary layer and allowing faster diffusion, boosting transpiration. Leaf color and soil pH don’t directly control transpiration, though soil moisture can influence stomatal opening indirectly by signaling water availability.