Each of these statements was made by a candidate in an examination. Each one contains at least one error. Decide what is wrong with each statement, and rewrite it correctly.
a. If Visking tubing containing a sugar solution is put into a beaker of water, the sugar solution moves out of the tubing by osmosis.
b. Plant cells do not burst in pure water because the cell wall stops water getting into the cell.
c. Animal cells plasmolyze in a concentrated sugar solution.
d. When a plant cell is placed in a concentrated sugar solution, water moves out of the cell by osmosis, through the partially (selectively) permeable cell wall.
Answers
Explanation:
If Visking tubing containing a sugar solution is put into a beaker of water, water will move from the water into the sugar solution, by osmosis. ... This is because there is a higher water potential outside the cell than inside it. The extra water makes the cell swell, until it bursts
Plant cells do not burst in pure water because, although water enters the cell by osmosis, the strong wall prevents the cell from bursting. ... OR Plant cells plasmolyse in a concentrated sugar solution.
animal cells do not have a cell wall, they cannot undergo plasmolysis. So the corrected sentence could be either: Animal cells shrink when placed in a concentrated sugar solution. ... It moves through the partially permeable cell membrane, down its water potential gradient
When a plant cell is placed in a concentrated sugar solution water moves out of the cell by osmosis through the partially permeable cell wall
Plasmolysis is the result of placing a plant cell in a concentrated sugar solution. So much water moves out of the cell by osmosis that the contents shrink, and the cell membrane pulls away from the cell wall. As animal cells do not have a cell wall, they cannot undergo plasmolysis.
a. If Visking tubing containing a sugar solution is put into a beaker of water, the sugar solution moves out of the tubing by osmosis is an incorrect statement.
- Correct Statement:- If a Visking tubing containing a sugar solution is put into a beaker of water, water will move from the water into the sugar solution, by osmosis.
- This is because there is a higher water potential outside the cell than inside it so the extra water makes the cell swell.
b. Plant cells do not burst in pure water because the cell wall stops water getting into the cell is an incorrect statement.
- Correct Statement:- Plant cells do not burst in pure water because, although water enters the cell by osmosis, the strong wall curbs the cell from bursting or plant cells plasmolyse in a concentrated sugar solution.
c. Animal cells plasmolyze in a concentrated sugar solution is an incorrect statement.
- Correct Statement:- Animal cells shrink when placed in a concentrated sugar solution
- And it moves through the partially permeable cell membrane, down its water potential gradient because animal cells do not have a cell wall, they cannot undergo plasmolysis.
d. When a plant cell is placed in a concentrated sugar solution, water moves out of the cell by osmosis, through the partially (selectively) permeable cell wall.
- Correct Statement:- When a plant cell is placed in a concentrated sugar solution water moves out of the cell by osmosis through the partially permeable cell wall
- Because plasmolysis is the result of placing a plant cell in a concentrated sugar solution. So much water moves out of the cell by osmosis that the contents shrink, and the cell membrane pulls away from the cell wall.
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