CLASS IX NCERT SCIENCE Chapter 5 Fundamental Unit of Life : Cell
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Types Of Solution Hypotonic solution (hypo-below) Isotonic solution (iso-equal) Hypertonic solution (hyper = above)
Isotonic Solution If the medium has exactly the same water concentration as the cell, there will be no net movement of water across the cell membrane. Water crosses the cell membrane in both directions, but the movement going in is the same as the amount of going out. The cell will stay the same size.
Hypotonic Solution If the medium surrounding the cell has a higher water concentration than the cell The cell will gain water by osmosis. The cell is likely to swell up.
Hypertonic Solution If the medium has a lower concentration of water than the cell The cell will lose water by osmosis. The cell will shrink.
Hypotonic solution Isotonic solution Hypertonic solution (a) Animal cell H20 H20 H20 H20 Lysed Normal Shriveled (b) PlantH2O H20 H20 cell Turgid (normal) Flaccid Plasmolyzed
Plasmolysis When a living plant cell loses water through osmosis there is shrinkage contraction of the contents of the cell away from the cell wall straction of theH,0 0 2
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