Our Environment

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Environment is the sum of physical and biological factors along with their chemical interactions that affect an organism. Physical factors refer to abiotic factors (land, air, water, sunlight etc.) an…

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A food chain shows who eats what in a particular habitat. It demonstrates how energy passes from one organism to another. The arrows between two organisms in the food chain always point from the food …

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At each transfer, a large proportion (80 to 90 percent) of energy is dissipated as heat during respiration and other reactions. After three steps in a food chain, very little energy is still available…

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A food web is a complex interconnected network of food chains in an ecosystem. Unlike a simple linear food chain, food webs show multiple feeding relationships because organisms at every trophic level…

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A niche describes an organism's occupation or role in the ecosystem - how it 'goes about its business and earns its living'. It includes not only the animal's position in the food web and what it eats…

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Ecological pyramid is a graphic representation of the feeding level (trophic level) of an ecosystem in the shape of a pyramid. It was first introduced by British ecologist Charles Elton in 1927. Produ…

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The three types of ecological pyramids are: 1) Pyramid of numbers - shows population at each trophic level, 2) Pyramid of biomass - shows quantity of living matter at different trophic levels, 3) Pyra…

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At each link in a food chain, there is normally an increase in size but decrease in number. Larger organisms need more food energy, so fewer can be supported. For example, many small aphids can feed o…