ICSE 2000 : SCIENCE Paper 3 (Biology) - Question 7(a) Diagrammatic questioning.

SCIENCE

Paper 3 (Biology) - 2000

(One Hour and a half)

Question 7
(a) The apparatus shown here is Garreau's pedometer designed to demonstrate unequal transpiration from the two surfaces of a dorsiventral leaf. Before keeping the leaf in between the cups, anhydrous calcium chloride (CaCl₂) 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, CaCl₂ vials were taken out and weighed again.

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1.
(i) What is the purpose of keeping CaCl₂ vials inside the cup?

2.
(ii) After a few hours, CaCl₂ vials were taken out and weighed again. Will you expect any difference in weight? If so give reason.

3.
(iii) What was the purpose of using a manometer?

4.
(iv) What do you mean by transpiration?

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