In plants, the tonoplast facilitates the transport of a number of ions and other materials against concentration gradients into the vacuole, hence their concentration is significantly higher in the vacuole than in the cytoplasm.
Adjacent to a frequently-asked paragraph in the same chapter.
A unicellular Amoeba uses its contractile vacuole to regulate water, while a multicellular plant cell depends on the tonoplast. Which unified principle of biology explains this?
Correct answer: A — Similar function of osmoregulation with structural diversity
Both Amoeba and plants regulate osmosis through specialised vacuoles, though structurally different. Illustrates unity of life principle.
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