The pH of the vacuolar cell sap is:

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(C) The vacuole is a membrane-bound space found in the cytoplasm. It contains water, sap, excretory products, and other materials not useful for the c

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Acidic and hypertonic

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(C) The vacuole is a membrane-bound space found in the cytoplasm. It contains water, sap, excretory products, and other materials not useful for the cell.In plant cells, the vacuole can occupy up to $90\%$ of the volume of the cell.The membrane surrounding the vacuole is called the tonoplast.The tonoplast facilitates the transport of a number of ions and other materials against concentration gradients into the vacuole, hence the concentration of ions is significantly higher in the vacuole than in the cytoplasm.Due to the active transport of protons ($H^+$ ions) into the vacuole, the cell sap becomes acidic.Furthermore, because of the high concentration of solutes compared to the cytoplasm, the vacuolar sap is hypertonic.

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