volume_mute
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publish date: 2026/06/15 09:06:6.259423 UTC
In mature plant cells, a large central vacuole often occupies most of the cell's volume. Its bounding membrane has a specific name.
This membrane is called the (1), and the fluid inside is called (2).
Please drag and drop the selected option in the right place or type it instead
tonoplast
plasma membrane
cell sap
cytosol
Correct Answer
(1) tonoplast
(2) cell sap
Explanation
The large plant vacuole is bounded by the tonoplast. The liquid inside is cell sap - mostly water with dissolved sugars, amino acids, proteins, and pigments. Cell sap is usually hyperosmotic relative to the external medium, so water moves in by osmosis, helping keep the cell turgid.
Reference
Biology: A Self-Teaching Guide