Question: 100% NCERT covered from Particular Keyword.Explanations are 100% from NCERT | [Difficult level: Easy] From NCERT NEET Derived Question.
Which of the following statement(s) is/are correct?
(i) Organisms living in oceans, lakes and rivers do not
face any water-related problems.
(ii) Euryhaline can tolerate a wide range of salinities.
(iii) Stenohaline are restricted to a narrow range of salinities.
(iv) No fresh water animals cannot live for long in sea water
but sea animals can live in fresh water for long time
because of osmotic balance
(a) All are correct (b) All are false
(c) Only (iv) (d) (i), (iii) and (iv)
Answer: c
Water: Water is another the most important factor influencing the life of
organisms. In fact, life on earth originated in water and is unsustainable
without water. Its availability is so limited in deserts that only special
adaptations make it possible for organisms to live there. The productivity
and distribution of plants is also heavily dependent on water. You might
think that organisms living in oceans, lakes and rivers should not face
any water-related problems, but it is not true. For aquatic organisms the
quality (chemical composition, pH) of water becomes important. The salt
concentration (measured as salinity in parts per thousand), is less than
5 in inland waters, 30-35 in the sea and > 100 in some hypersaline
lagoons. Some organisms are tolerant of a wide range of salinities
(euryhaline) but others are restricted to a narrow range (stenohaline).
Many freshwater animals cannot live for long in sea water and vice versa
because of the osmotic problems, they would face.
