Transpiration decreases in__________ conditions.

Correct option is A

The Correct answer is (a) High humidity.
· Transpiration is the process by which plants lose water in the form of water vapor from their leaves, mainly through the stomata.
· In conditions of high humidity, the air already contains a large amount of water vapor, which reduces the concentration gradient between the moisture inside the leaves and the surrounding air.
· This low gradient slows down the rate of water evaporation, thereby decreasing the rate of transpiration.
· When the air is humid, the plant does not need to lose as much water to balance internal moisture levels, which is why transpiration is reduced.
· Other factors like light intensity, temperature, and wind can also affect transpiration, but high humidity has the most significant dampening effect.
Information Booster:
· High light intensity: More light increases photosynthesis, which opens stomata and increases transpiration. So, transpiration usually increases under high light intensity.
· Low humidity: In conditions of low humidity, the air is dry, leading to a steeper concentration gradient, which increases the rate of transpiration.
· High temperature: Higher temperatures cause water to evaporate more quickly from plant surfaces, which can increase the rate of transpiration unless humidity is also high.