Answer: Excess of transpiration due to heat.
Step-by-step explanation:
The water cycle is the process by which the amount of water on earth is maintained. The percentage of water on earth remains constant.
The evaporation of water from water bodies, transpiration of water from the plants adds water into the atmosphere which goes up and condenses to form clouds.
Excess of heat will lead to more transpiration from plants which is harmful for plants as it will dry out the plants.