An osmoscope is used for:

Who devised the apparatus to determine the degree of opening of stomata?

Position and frequency of stomata can be determined by

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

Who proposed the Pulsation Theory for the ascent of sap?

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