The instrument used for estimating consumptive use of water is

Correct option is C

A Lysimeter is a scientific instrument used to measure the consumptive use of water by plants through evapotranspiration. It allows researchers to accurately evaluate how much water is absorbed by the plant and how much is lost through evaporation and transpiration. Lysimeters are crucial in irrigation management, crop water requirement studies, and hydrological modeling. Unlike anemometers or piezometers, lysimeters provide direct physical measurement of water balance in soil-plant systems.