The number of stomata and epidermal cells in $1 {\mathrm{mm}}^2$ leaf area of lower epidermis of the leaves of $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$ plants are given below. Arrange the plants in decreasing order of their stomatal index.

Cell	Numbers of Stomata	Numbers of epidermal cells
$\mathrm{X}$	$30$	$150$
$\mathrm{Y}$	$60$	$240$
$\mathrm{Z}$	$90$	$400$

The correct answer is

Given below are two statements:

Statement I: The forces generated by transpiration can create pressures sufficient to lift a xylem sized column of water over 130 metres high.
Statement II: Transpiration cools leaf surfaces, sometimes 10 to 15 degrees, by evaporative cooling.

In the light of the above statements, choose the most appropriate answer from the options given below:

Study the diagram and the list given below.

i) Chloroplast

ii) Epidermal cell

iii) Guard cell

iv) Subsidiary cell

v) Stomatal pore

The correct match is

Given below is a diagram of the stomatal apparatus. Match the labels with the corresponding names of the compounds. 

Choose the correct combination.