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When a fresh water protozoan is placed in marine water----
- a)The contractile vacuole increase in size
- b)The contractile vacuole disappear
- c)Number of contractile vacuole increases
- d)The contractile vacuole remain same
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
When a fresh water protozoan is placed in marine water----a)The contra...
Fresh water protozoans live in hypotonic solution so, for regulation of excess of water which comes in the protoplasm through the process of endosmosis, contractile vacuoles have developed, When these protozoans are placed in marine water i.e., hypertonic water, the contractile vacuoles become disappear because the process of endosmosis does not happen and thus, water does not come in the protoplasm.
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Most Upvoted Answer
When a fresh water protozoan is placed in marine water----a)The contra...
When a fresh water protozoan is placed in marine water, the correct answer is option 'B' i.e., the contractile vacuole disappears. This is because of the following reasons:
Explanation:
• Freshwater protozoans live in freshwater environments where the surrounding water is hypotonic i.e., the concentration of solutes is lower outside the cell than inside the cell. Due to this, water tends to move inside the cell by osmosis, causing the cell to swell.
• In order to maintain the water balance and prevent the cell from bursting, freshwater protozoans have a specialized organelle called the contractile vacuole.
• The contractile vacuole acts as an osmoregulatory organelle by pumping out excess water from the cell.
• However, when a freshwater protozoan is placed in marine water, the surrounding water becomes hypertonic i.e., the concentration of solutes is higher outside the cell than inside the cell. Due to this, water tends to move out of the cell by osmosis, causing the cell to shrink.
• Since there is no excess water to be pumped out, the contractile vacuole disappears in marine water.
• This is an adaptation of freshwater protozoans to their environment and helps them survive in hypotonic conditions by preventing the cell from bursting.
Hence, the correct answer is option 'B' i.e., the contractile vacuole disappears when a freshwater protozoan is placed in marine water.
Explanation:
• Freshwater protozoans live in freshwater environments where the surrounding water is hypotonic i.e., the concentration of solutes is lower outside the cell than inside the cell. Due to this, water tends to move inside the cell by osmosis, causing the cell to swell.
• In order to maintain the water balance and prevent the cell from bursting, freshwater protozoans have a specialized organelle called the contractile vacuole.
• The contractile vacuole acts as an osmoregulatory organelle by pumping out excess water from the cell.
• However, when a freshwater protozoan is placed in marine water, the surrounding water becomes hypertonic i.e., the concentration of solutes is higher outside the cell than inside the cell. Due to this, water tends to move out of the cell by osmosis, causing the cell to shrink.
• Since there is no excess water to be pumped out, the contractile vacuole disappears in marine water.
• This is an adaptation of freshwater protozoans to their environment and helps them survive in hypotonic conditions by preventing the cell from bursting.
Hence, the correct answer is option 'B' i.e., the contractile vacuole disappears when a freshwater protozoan is placed in marine water.
Community Answer
When a fresh water protozoan is placed in marine water----a)The contra...
The fxn of d contractile vacoule is to remove d excess water coming from outside into d cell.now in case of hypertonic solution d water is going out from the cell. so to prevent the cell from dehyradtion the contractile vacoule disappears
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When a fresh water protozoan is placed in marine water----a)The contractile vacuole increase in sizeb)The contractile vacuole disappearc)Number of contractile vacuole increasesd)The contractile vacuole remain sameCorrect answer is option 'B'. Can you explain this answer?
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