The apparatus shown in the following diagram is Garreau's photometer designed to demonstrate unequal transpiration from the two surfaces of a dorsiventral leaf. Before keeping the leaf in between the cups, anhydrous calcium chloride $(C a c l_{2})$ contained in two small vials were weighed and placed in both the cups. The ends of the cups were closed with corks through which two mercury manometers were connected. After few hours, $C a c l_{2}$ vials were taken out and weighed again.
What do you mean by transpiration here?

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Solution

Transpiration is the loss of water in the form of water vapour from the leaves and other aerial parts of the plant.

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Q. The apparatus shown in the following diagram is Garreau's potometer designed to demonstrate unequal transpiration from the two surfaces of a dorsiventral leaf. Before keeping the leaf in between the cups, anhydrous calcium chloride

(C a C l_{2})

contained in two small vials were weighed and placed in both the cups. The ends of the cups were closed with corks through which two mercury manometers were connected. After few hours,

C a C l_{2}

vials were taken out and weighed again.
What is the purpose of keeping

C a C l_{2}

vials inside the cup?

(C a c l_{2})

contained in two small vials were weighed and placed in both the cups. The ends of the cups were closed with corks through which two mercury manometers were connected. After few hours,

C a c l_{2}

vials were taken out and weighed again.
What was the purpose of using a manometer?

(C a C l_{2})

contained in two small vials were weighed and placed in both the cups. The ends of the cups were closed with corks through which two mercury manometers were connected. After few hours,

C a C l_{2}

vials were taken out and weighed again. Will you expect any difference in weight? If so, give reason.

The apparatus shown in the following diagram is Garreau's photometer designed to demonstrate unequal transpiration from the two surfaces of a dorsiventral leaf. Before keeping the leaf in between the cups, anhydrous calcium chloride $C a C l_{2}$ contained in two small vials were weighed and placed in both the cups. The ends of the cups were closed with corks through which two mercury manometers were connected. After few hours, $C a C l_{2}$ vials were taken out and weighed again.

(a) What is the purpose of keeping $C a C l_{2}$ vials inside the cup?

(b) After a few hours, $C a C l_{2}$ vials were taken out and weighed again. Will you expect any difference in weight ? If so, give reason.

(d) What do you mean by transpiration?

The apparatus shown in the given diagram is Garreau's potometer designed to demonstrate unequal transpiration from the two surfaces of a dorsiventral leaf. Before keeping the leaf in between, the cups were closed with corks through which two mercury manometers were connected. After few hours, CaCl2 vials were taken out and weighed again.

(a) What is the purpose of keeping CaCl2 vials inside the cup?
(b) After few hours CaCl2 vials were taken out and weighed again. Will you expect any difference in weight? If so, give reason.
(c) What was the purpose of using a manometer?
(d) What do you mean by transpiration? [5 MARKS]

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