The given diagram shows a respirometer that is used to measure gaseous exchange in gram seeds. The apparatus is maintained at a constant temperature.

Which of the following is correct regarding it?
(i) The gas pressure in $\mathrm{X}$ will fall as ${\mathrm{O}}_2$ is absorbed during respiration and ${\mathrm{CO}}_2$ is absorbed by potassium hydroxide solution.
(ii) The fluid level at $\mathrm{Y}$ will fall to compensates the loss of pressure in $\mathrm{X}$.
(iii) The gas pressure in $\mathrm{X}$ will rise as ${\mathrm{O}}_2$ is given out by seeds and ${\mathrm{CO}}_2$ is released by potassium hydroxide solution.
(iv) The fluid level at $\mathrm{Z}$ will rise due to loss of pressure in $\mathrm{X}$.