Question

Transpiration pull will be maximum under which of the following conditions?

• A. Open stomata, high intensity of light and well irrigated soil
• B. Open stomata, high humid atmosphere and dry soil
• C. Closed stomata, low light intensity and humid atmosphere
• D. Closed stomata, low light intensity and humid atmosphere

Answer 1

The correct option is A Open stomata, high intensity of light and well irrigated soil

It is essential that stomata is open for transpiration to occur. But for the stomata to remain in an open state, light is essential, because light plays a role in the accumulation of potassium ions in the guard cell, which ensures that the guard cells remain turgid and thus maintain stomata in the open state. Humidity is also a factor that affects transpiration. High humidity means high water vapor content in the atmosphere and when the atmosphere is saturated with water vapor, it does not vaporize easily through transpiration. The source of water for transpiration out of the plant comes from the soil. Plants with adequate soil moisture will normally transpire at high rates because the soil provides the water to move through the plant.