INTRODUCTION
CELL STRUCTURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Hypertonic setting:the amoeba shrivels up as water in the amoeba moves across it’s semi-permeable membrane into the jar of water.
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Hypotonic setting:the amoeba swells up as water in the jar moves across the amoeba’s semi-permeable membrane into the amoeba’s body.
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Isotonic setting:nothing happens as the concentration of the freshwater in the jar is equal to the concentration of freshwater in the amoeba’s body
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None of the above
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Detailed explanation-1: -Osmoregulation in unicellular freshwater organisms like amoebas and paramecia involves an organelle called the contractile vacuole, which collects excess water as it accumulates in the cell and pumps it out.
Detailed explanation-2: -Gases like carbon dioxide and oxygen can move across the cell membrane via diffusion. Diffusion is the movement of gas molecules from a region of higher concentration, to a region of lower concentration through a semi-permeable membrane.
Detailed explanation-3: -Oxygen diffuses through the cell membrane and is transported in blood plasma by free diffusion and by convection.
Detailed explanation-4: -A cell membrane is semipermeable. Which will most likely happen if a freshwater plant cell is placed in a beaker of salt water for an hour? It will lose water and shrink.