Water is essential for all living organisms because

It is a universal solvent

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Protoplasm of the cell is nothing but water

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It is the medium through which solutes are transported

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All of these

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Solution

The correct options are
A
It is a universal solvent

B
Protoplasm of the cell is nothing but water

C
It is the medium through which solutes are transported

D
All of these

Water is essential for physiological activities of living organisms. $85 - 90 %$ of water is present in protoplasm. Inorganic and organic solutes are transported along with water as it can act as a stable buffer to maintain optimum pH for ionic balance in a plant cell.

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Question 12
Study the following statements about ozone:
(a) It is essential for breathing of living organisms.
(b) It is used to disinfect water.
(c) It absorbs ultraviolet rays
(d) Its proportion in air is about 3%.

Which of these statements are correct?
(i) (a), (b) and (c)
(ii) (b) and (c)
(iii) (a) and (d)
(iv) All four

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