Question

Transpiration is measured by
A)Manometer
B)Barometer
C)Potometer
D)Hygrometer

Answer 1

Hint: It is used to measure the rate of transpiration by measuring the rate of water uptake by a leafy plant shoot Because Transpiration is the main reason for the uptake of water by the cut shoot. Comprises a capillary tube, a reservoir, and a tube for holding the shoot.

Complete answer:
Transpiration is measured by a potometer. This device measures the rate of transpiration at the rate by which the plant draws the water. The plant draws the water And the drops of water appear because of transpiration. so the potometer helps in the measurement of the rate of transpiration.
Some of the basic elements of a photometer are-
1)Cutting of a plant
2)To measure water loss, use of a calibrated pipette.
3)Clear plastic tubing of a proper length.
4)Between the plant and the water-filled tubing, make an airtight seal.

Additional Information: Step by step procedure-
-Cutting of a shoot from a plant. After that, soak the base of a plant into the water to prevent from taking up any air by the xylem.
-Now put the stem into a huge sink that is full of water, and trim the shoot with the sharp razor blade. always keep the leaves out of water.
-The photometer device is immersed whole in the sink And moves it until all the air bubbles come out.
-Next step is putting the shoots stem into the bung And greasing it with plenty of petroleum jelly. Now put the bung into the photometer.
-Always make sure the tap should be closed, And lift all the ensemble out of the water.
-Until the air Bubbles come the end of the capillary tube should be out of the water. As soon as air Bubbles forms, again put it into a beaker of water
Manometer- it is used to measure and indicate pressure.
Barometer-it is used to measure atmospheric pressure.
Hygrometer-it is used to measure the humidity.

So, the correct answer is, "potometer".

Note: Limitations:
-Entering the air bubble is not easy in the potometer.
-the leafy shoot will not remain fully alive for as long as we want.
-If there will be any change in the outside temperature of the air, it will affect the position of the air bubble in the capillary tube.