Question

Water is essential for life because ………..
A. It keeps the temperature low.
B. It is raw material of photosynthesis.
C. It is used in transpiration.
D. Most of the metabolites react in a dissolved state and water is the main solvent.

Answer 1

Hint: Water is called the elixir of life as without water life cannot sustain. Counting on from small entities to large living organisms everyone depends on water for their existence.

Complete Answer:
Water plays a vital role in a lot of functions that happen around us. It is thus considered as the most important thing without which life is not possible. Owing to its great properties and significance let us analyze the options to find out why water is essential for life.

Option A: Water is essential for maintaining body’s temperature. However, it does not keep the temperature low. It maintains the body’s temperature so that all the other activities in the body can be performed easily. Therefore, this is the incorrect option.

Option B: Water is a requirement for the process of photosynthesis in some plants, however it is not an essential raw material for the process of photosynthesis. Therefore, this is the incorrect option.

Option C: In transpiration, excess water is eliminated from the plants in the form water vapours. It is thus not used in the process of transpiration. Therefore, this is the incorrect option.

Option D: Water is considered as a universal solvent. It is used as a solvent for dissolving a lot of solutes. Even inside the body, all the metabolic processes require a liquid medium. Water helps in the transportation of liquids in all the parts of the body. Ranging from biological solvents to chemical solvents, water is an essential component.Therefore, this is the correct option.

Thus, the correct option is D) Most of the metabolites react in dissolved state and water is the main solvent.

Note: Water also helps in removal of toxic substances out of the body. It helps in cleaning of all body waste. Excess water is flushed out of the body in the form of sweat and urine. Release of sweat is a way in which the body maintains water balance, regulates temperature of the body.