Question

There is no life on moon because of the absence of
A. Water
B. Oxygen
C. Nitrogen
D. Hydrogen

Answer 1

Hint: For existence of life on moon, many factors are needed. Life did exist on Earth with little to no oxygen. However, this answer can be debatable. Gravity also plays an important role for existing life that is there on the Earth. Atmosphere is also an important aspect considering the existence of life as it protects from bad radiations.

Complete answer:
> Option A- Water: Life began in water’s presence. It is the most essential element required to a living organism. It constitutes 65-70% of our body weight. It has the remarkable ability to flow. Important process of transfer of substances across a cell to the cell’s environment can be done by water. Without water one cannot survive anywhere.

> Option B- Oxygen: Scientists have reported that life does exist without the oxygen. There are some animals that are oxygen free which means that they do not depend upon oxygen for their survival. The early atmosphere had barely the trace of this element. The oxygen is heavy and therefore it was always left off behind and reacted with other gases of the atmosphere and was taken out into the crust and mantle.

> Option C- Nitrogen: It does not get absorbed directly from air by the plants and animals. Nitrogen is not essentially required but its sources like amino acids and proteins are important and that we obtain from the foods we eat.

> Option D- Hydrogen: Hydrogen is important from making up of water. But it isn’t as important as water.

Hence, the correct answer is option (A). As there is no life possible anywhere without water.

Note: There are important biological roles of water. It is known as the universal solvent because it can be easily dissolved in different types of substances. However, a true universal solvent does not exist. Water also has a structural role in biology. Water can fill up cells so as to maintain their proper shape and structure. Important process of photosynthesis in plants requires water. No other molecule can be compared with water because of its unique properties.