The diagram shown is an apparatus used to study a particular phenomenon in plants: [5 MARKS]
(a) Name the apparatus.
(b) What is it used for?
(c) What is the role played by the air bubble in this experiment?
(d) What is the use of the reservoir?

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Solution

a) 1 Mark
b) 1 Mark
c) 2 Marks
d) 1 Mark

(a) The apparatus is Ganong's potometer.
(b) It is used to measure the rate of transpiration.
(c) The air bubble in the capillary tube shows the pull of water from the beaker. The air bubble can be brought back to its original position and reading can be taken again.
(d) The reservoir helps in pushing back the bubble by releasing water.

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Similar questions

Given below is the diagram of an apparatus used to study a particular phenomenon in plants :

(a) Name the apparatus.

(b) What is it used for ?

(d) What is the use of the reservoir ?

(e) What happens to the movement of the air-bubble if the apparatus is kept :

(i) in the dark; (ii) in sunlight; (iii) in front of a fan ?

Give a reason in each case.

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