Our Environment — Flashcards

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Environment is the sum of physical and biological factors along with their chemical interactions that affect an organism. It includes abiotic factors like land, air, water, and sunlight, and biotic fa…

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Habitat is the place where an organism lives. It is different from niche. Habitat tells where an organism lives, while niche tells its role, feeding habit, and mode of life.

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A food chain shows who eats what in a habitat and how energy passes from one organism to another. The arrows always point from the food to the feeder.

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The arrows in a food chain always point from the food to the feeder. This shows the direction of energy transfer.

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One example is: Grass -> grasshopper -> frog -> snake -> Hawk. It starts with a producer and ends with a top carnivore.

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A food chain rarely consists of more than four steps because 80 to 90 percent of energy is dissipated as heat at each transfer. After three steps, very little energy remains for top carnivores.

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The number of organisms decreases at each successive trophic level from producer to consumers. Fewer organisms can be supported at higher levels because less energy is available.

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A food web is a network of interlinked food chains in an ecosystem. It shows that many organisms have more than one food source and more than one predator.