Which of the following techniques was used by Mitler for collecting phloem sap?

Ganong's potometer is used to measure

Match the theories given in column-$I$ with the names of scientists listed in column-$II$. Choose the answer which gives the correct combination of the alphabets.

Column-$I$ (Names of theories)	Column-$II$ (Names of scientists)
$(A)$ Relay pump theory	$(p)$ Stocking
$(B)$ Transpiration cohesion theory	$(q)$ Sir $J$.$C$. Bose
$(C)$ Mass flow	$(r)$ Godlewski
$(D)$ Pulsation theory	$(s)$ Dixon and Joly
	$(t)$ Ernst Munch

Which of the following is used to determine the rate of transpiration in plants?

Position and frequency of stomata can be determined by

Which of the following instruments is used to measure the rate of transpiration in plants?