Answer: The answer is D: Opening stomata at night only
Step-by-step explanation:
Opening stomata at night only is the physiological adaptation that would decrease the process of transpiration in a plant.
Transpiration referred to the way water move through plant evaporation from aerial parts, such as leaves, stems and flowers. Transpiration of plant is also loss of water from stomata.
Stomata means pores used for gas exchange. It is found in plants and some stems.