Which of the following cell organelles is bounded by a single unit membrane?

Select the mismatch.

Read the following statements and identify the correct option.
$(i)$ Contractile vacuole takes part in osmoregulation and excretion.
$(ii)$ Food vacuole is formed by engulfing the food particles.
$(iii)$ The vacuole is bound by a double membrane called tonoplast.
$(iv)$ Vacuole can occupy up to $90$ percent of the volume of the cell.

Urate oxidase occurs in

Identify the incorrect match.

The pH of the vacuolar cell sap is: