MICHAEL ABBEY / SCIENCE PHOTO LIBRARY MICHAEL ABBEY / SCIENCE PHOTO LIBRARY
Red onion cells in hypotonic solution. Hypotonic solutions contain low concentration of solute relative to the cells' cytoplasm. When the cells are placed in a hypotonic solution, the water diffuses into the cell, causing the cell to become turgid (swell). Series, 2 of 3 (see 3Q3358 and 3Q3357 for isotonic and hypertonic solutions).
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