Arrange the following levels of organisations in the order of lowest to highest complexity.
Organism, Population, Biosphere, Biomes, Ecosystem, Community
A
Organisms → Community → Population → Ecosystem → Biomes → Biosphere
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B
Organisms → Population → Ecosystem → Community → Biomes → Biosphere
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C
Organisms → Population → Community → Biome → Ecosystem → Biosphere
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D
Organisms → Population → Community → Ecosystem → Biomes → Biosphere
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Solution
The correct option is D Organisms → Population → Community → Ecosystem → Biomes → Biosphere Study of the relationship of a living being with other living organisms and its surrounding physical environment like temperature, air, water, etc is called Ecology. It can also be considered as the study of distribution and abundance of organisms.
Ecology can be studied at various levels, in order to understand the interaction of organisms with their environment. The order of these levels, from lowest to highest complexity is as follows :
Organisms - Any living individual such as an animal, plant, fungus, archaeon, or bacterium. They are the basic units of Ecology.
Population - A group of individuals belonging to the same species living and occupying a given area at a particular time. For example, the human population of Bangalore.
Community - A group or association of populations of two or more different species occupying the same geographical area at the same time. For example, a farmer community with cattles (cows, buffaloes) in an area.
Ecosystem - It includes biological communities along with the physical environment with which they interact. For example, living (fishes, frogs) and nonliving things (soil, temperature) in a pond ecosystem.
Biome - It is a large community that includes vegetation and wildlife adapted to specific climate conditions. For example, Deserts are characterised by less than 50 centimeters per year, rainfall. It is extremely hot during the day and very cold at night. Examples of organisms include plants like cactus and animals like camels, snakes etc.
Biosphere - It is also called ecosphere and it is the sum of all ecosystems.