A) plant community
B) animal ecosystem
C) plant ecosystem
D) ecological niche
Correct Answer: A
Solution :
A population consists of organisms of a particular species and has characteristics like natality, mortality, age structure growth dynamics etc. When several populations share a common habitat and its resources, they interact among themselves and develop into a biotic community. Hence, community is a larger unit than a population. Ecosystem comprises the biotic community and the non-living environment. It is the basic functional unit as it includes both the organism and its environment. Ecological niche includes the physical space occupied by an organism and its functional role in the community and its position in environmental gradients of temperature, moisture, pH, soil and other conditions of existence.
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