Question

The instrument that can be used to demonstrate transpirational pull due to vaporization of water is
A.Potometer
B.Atmometer
C.Auxanometer
D.Anemometer

Answer 1

Atmometer or evaporimeter is an instrument used to measure the rate of evaporation from one surface to the atmosphere. This instrument is primarily used to estimate the evapotranspiration rates of plants at a given farming location. This gives a good measure of much transpiration loss occurs to crops at specific locations and at specific conditions.

Complete answer: Atmometer is a scientific instrument employed to estimate the rate of evaporation. This is also called an evaporimeter, as the aim is to measure the evaporation rate. The setup consists of a ceramic plate, connected to a tube which extends into a water reservoir placed in a long cylindrical structure made of plastic or glass.
Along the side is a gauge that connects to the bottom of the reservoir. The ceramic plate is covered by a canvas which prevents things from falling onto the plate but also simulates the heat radiation conditions as experienced by plants.
The ceramic plate remains wet throughout. As the water evaporates, the water is drawn from the reservoir to the plate, and as the water is drawn to the plate the water level in the reservoir slowly reduces which can be seen by the gauge along the side of the setup.
This instrument provides insight as to how much irrigation the crops require and effectively preventing over-irrigation and saving money and resources. These instruments are of low cost, easy to operate, and do not require technical knowledge.
Thus, the correct option is B) Atmometer

Note: Atmometers measure the levels of evaporation.
Used to identify the evapotranspiration loss in plants.
Consists of a ceramic plate, which is porous, the porous nature ensures continuous absorption of water from the reservoir.
The canvas on top of the plate has a dual function. It prevents particles and other insects from touching the plate and also stimulates conditions as seen in plants, where water has to transpire through various membranes within the plant and there is no direct sunlight falling in the water molecules within the plant.