Question

Study the following columns and choose the correct option.

Column -I		Column -II
(A)	Population	(1)	Part of the earth consisting of all the ecosystems of the world
(B)	Community	(2)	assemblage of all the individuals belonging to different species occurring in an area
(C)	Ecosystem	(3)	Group of similar individuals belonging to the same species found in an area
(D)	Ecosphere	(4)	Interaction between the living organisms and their physical environment components
		(5)	Classification of organisms based on the type of environment

• A. (A)- (1), (B) - (4), (C) - (5), (D) - (3)
• B. (A)- (5), (B) - (2), (C) - (3), (D) - (4)
• C. (A)- (2), (B) - (3), (C) - (5), (D) - (1)
• D. (A)- (3), (B) - (2), (C) - (4), (D) - (1)

Answer 1

Answer: (D)

Ecology is basically concerned with four levels of biological organization - organisms, populations, communities, ecosystems, and biomes.
A population is a group of similar individuals in a particular geographical area or space. Community is the assemblage of interdependent and interacting populations of different species present in an area. The ecosystem is the sum of the biotic (living) and abiotic (non-living) components of a particular geographical area. The biosphere also called the ecosphere or giant ecosystem is the largest and nearly self-sufficient biological system. It is formed of all the ecosystems of the world. It is also called the "life-supporting zone" of the earth.