Give scientific reasons : Majority of fresh water organisms have contractile vacuoles while marine organisms lack them.
Give scientific reasons : Majority of fresh water organisms have contractile vacuoles while marine organisms lack them.
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.
Similar Questions
Choose correct pair :
$(1)$ Salt concentration in inland water - $30-35\%$
$(2)$ Salt concentration in the sea - $5\%$
$(3)$ Salt concentration in hypersalinelagoon - $>100\%$
Choose correct pair :
$(1)$ Salt concentration in inland water - $30-35\%$
$(2)$ Salt concentration in the sea - $5\%$
$(3)$ Salt concentration in hypersalinelagoon - $>100\%$
Eurythermal animals and plants are those which
Eurythermal animals and plants are those which
Mango, tuna fish, snow leopards are
Mango, tuna fish, snow leopards are
Assertion : Leaf butterfly and stick insect show mimicry to dodge their enemies.
Reason : Mimicry is a method to acquire body colour blending with the surroundings.
Assertion : Leaf butterfly and stick insect show mimicry to dodge their enemies.
Reason : Mimicry is a method to acquire body colour blending with the surroundings.
- [AIIMS 2003]
- It has the ability to concentrate its urine.
- It provide water requirements from its internal fat oxidation.
- It is present in American desert.
- It has the ability to concentrate its urine.
- It provide water requirements from its internal fat oxidation.
- It is present in American desert.