EVERYDAY SCIENCE

SCIENCE

CELL BIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Why do plant cells become flaccid in concentrated sugar solution?
A
They gain water by osmosis
B
They lose water by osmosis
C
They lose water by active transport
D
None of the above
Explanation: 

Detailed explanation-1: -If a plant cell is surrounded by a solution that contains a lower concentration of water molecules than the solution inside the plant cell, water will leave the cell by osmosis and the plant cell will become flaccid (soft).

Detailed explanation-2: -When a living plant cell loses water through osmosis, there is contraction of the contents of the cell away from the cell wall. This phenomenon is called plasmolysis.

Detailed explanation-3: -Plant cells placed in a solution with a low water concentration compared to their contents (concentrated sugar solution) will lose water by osmosis. Their cell membranes will peel away from their cell walls and they are said to be plasmolysed .

Detailed explanation-4: -Water moves into and out of cells by osmosis. If a cell is in a hypertonic solution, the solution has a lower water concentration than the cell cytosol, and water moves out of the cell until both solutions are isotonic.

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