Question

Which of the following statement is incorrect about biosphere?
A) Biosphere is a combination of lithosphere, hydrosphere and atmosphere
B) Biosphere is missing at the extreme ends of North pole and south pole
C) Organisms are equally present in the biosphere
D) All of the above

Answer 1

A biosphere is a thin layer of Earth’s atmosphere that supports life which extends to a few kilometres in the atmosphere to the deep sea vents of the ocean. It is a global ecosystem which consists of the biotic as well as the abiotic factors.

Complete answer:
Let us start by knowing the details of biosphere to decide which among is an incorrect statement. Biosphere is a part of earth whose regions possess life. The biosphere is the second high level component along the geosphere that is a part of Earth. Various living organism depending upon their life cycle lives in various regions in various number. Biospheres are not found everywhere,some areas do not support the conditions of required for biosphere.Hence organisms are not uniformly distributed throught the world.

Biosphere is a combination of atmosphere, lithosphere and hydrosphere. It is a part of earth that consists of the biological communities and its respective environment. The atmosphere is the gaseous part which surrounds the lithosphere. The lithosphere consists of upper mantle and earth’s crust. The hydrosphere is the water i.e. present in the earth’s surface. There are various points on earth like the north pole and the south pole where biosphere is absent.

From the above discussion, we know that option (C) is the correct answer.

Note: The atmosphere is said to be evolved around 3.8 billion years ago. There were only prokaryotes at that time which use to survive without oxygen and so the environment was reducing in nature. Later, the increased amount of oxygen in the atmosphere caused greater biodiversity due to the presence of aerobic organisms and their evolution.