Give scientific reasons : Majority of fresh water organisms have contractile vacuoles while ma

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11.Organisms and Populations

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Give scientific reasons : Majority of fresh water organisms have contractile vacuoles while marine organisms lack them.

Option A

Option B

Option C

Option D

Solution

Osmotic concentration of fresh water organisms like Amoeba, Paramoecium is hypertonic to surrounding water so water enters inside them by endosmosis. This excess of water is expelled with the help of contractile vacuoles so these help in osmoregulation. Marine protozoan are isotonic to sea water, so they do not have contractile vacuole.

Standard 12

Biology

Factors which play significant role in the formation of major biomes are

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What is the basis of variations in the physical and chemical conditions of different habitats?

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When young plants are grazed too heavily, they get killed because of

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– It has the ability to concentrate its urine.

– It provide water requirements from its internal fat oxidation.

– It is present in American desert.

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People living at sea level have around $5$ million $RBC$ per cubic millimeter of their blood whereas those living at an altitude to $5400$ metres have around $8$ million. This is because at high altitude

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(AIPMT-2006)

Give scientific reasons : Majority of fresh water organisms have contractile vacuoles while marine organisms lack them.

Solution

Similar Questions

Factors which play significant role in the formation of major biomes are

What is the basis of variations in the physical and chemical conditions of different habitats?

When young plants are grazed too heavily, they get killed because of

– It has the ability to concentrate its urine. – It provide water requirements from its internal fat oxidation. – It is present in American desert.

People living at sea level have around $5$ million $RBC$ per cubic millimeter of their blood whereas those living at an altitude to $5400$ metres have around $8$ million. This is because at high altitude

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– It has the ability to concentrate its urine.

– It provide water requirements from its internal fat oxidation.

– It is present in American desert.