(i) Ganong’s Potometer. (ii) Any changes in the outside air temperature may affect the position of the air bubble in the capillary tube

Question

Given below is an apparatus used to study a particular process in plants. Study the same and answer the questions that follow:

(i) Name the apparatus. 

(ii) Mention one limitation of this apparatus. 

(iii) Which phenomenon is studied with the help of this apparatus ? 

(iv) What is the function of the part marked ‘reservoir’ ? 

(v) What is the role of the air bubble in the experiment ?

Answer 1

(i) Ganong’s Potometer. 

(ii) Any changes in the outside air temperature may affect the position of the air bubble in the capillary tube. 

(iii) Transpiration. 

(iv) Reservoir helps in bringing back the bubble to its original position. This can be done by releasing some water into the capillary tube by opening the stop-cock. 

(v) The rate of water uptake can be calculated by timing the movement of air bubble over a fixed distance on the scale.