Question

Which planet is known as the 'Watery Planet'?
A.Jupiter
B.Venus
C.Earth
D.Mars

Answer 1

Hint:A self -sustaining structural and functional unit of the biosphere is called the Ecosystem. The sun is the source for its energy. A pond, a lake, desert, grassland, meadow, forests are common examples of ecosystems.

Complete answer:
There is an exchange of materials and energy within the ecosystem as well as between neighbouring ecosystems. They are all interconnected and hence, interrelated. The Vast network of all ecosystems which are connected to each other constitute the biosphere. Thus, the biosphere is that part of the earth's terrestrial system including air, land and water - in which life develops and where life processes and is transformed. It is also called the life zone of the earth.
Water from various sources on earth like seas, rivers and lakes evaporates into the atmosphere where it condenses and falls back in the form of precipitation. Most of the water on land flows to the oceans. Thus, water moves in a continuous cycle and this cycle is called a hydrological cycle. Water can absorb an enormous amount of heat but there is not much change in its temperature. During the day, water bodies absorb enormous amounts of heat making the earth surface fairly cool. At night the water bodies release vast amounts of heat that they had absorbed during the day, which along with other atmospheric effects, keep most of the surface from freezing at night. As there is more water on Earth's surface a balance is maintained which is very significant in survival of living organisms.

Hence, the correct answer is option (C).

Note:There is a proper balance maintained between evaporation, condensation and precipitation without which life would not have been possible on earth.