How the change in $pH$ occurs in guard cells was explained and the theory of starch $\rightleftharpoons$ sugar interconversion was proposed by:

When strips of cobalt chloride paper are placed on either side of a dorsiventral leaf,why do the strips on the lower side become pink more speedily?

Which process is demonstrated when a leafy twig of a sub-tropical plant is immersed in water?

Given below are two statements:
Statement $I$: The forces generated by transpiration can lift a xylem-sized column of water over $130 \text{ meters}$ in height.
Statement $II$: Transpiration cools leaf surfaces,sometimes by $10$ to $15$ degrees,through evaporative cooling.
In the light of the above statements,choose the most appropriate answer from the options given below:

Hydathodes are also called

How much percentage of water is utilized for cell expansion and plant growth (in $\%$)?