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Types of Organisms

Contractile v...

Question

Contractile vacuole of Amoeba placed in salt water will

A

Burst

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B

Disappear

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C

Enlarge

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D

Multiply

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Solution

The correct option is B Disappear
If an Amoeba is placed in salt water, its contractile vacuole will disappear, because endo-osmosis will not occur due to isotonic condition.

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Q. A single-celled organism which has contractile vacuole to move water from inside to outside of the cell was studied in an experiment in which the organism was placed in water with different salt concentrations. The rate at which the contractile vacuole contracted to pump out excess water was recorded.

Salt conc.	Rate of contractile vacuole contractions per minute
Very high	2
High	8
Medium	15
Low	22
Very Low	30

Which of the following explains the observed relationship between the rate of contractile vacuole contraction and the salt concentration?

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