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Question
Among the following categories of organisms given, which of the following is present at the first trophic level ?
Among the following categories of organisms given, which of the following is present at the first trophic level ?
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Solution
The correct option is A Producers
A food chain refers to the order of events in an ecosystem, where one living organism eats another organism, and later that organism is consumed by another larger organism. It also explains the feeding pattern or relationship between living organisms in a food chain.
Different organisms occupy different levels in the food chain and each level is referred to as trophic levels.
The ultimate source of energy is sunlight. Producers (green plants) are organisms, synthesising their own food by photosynthesis. It is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar. They present at the bottom or first trophic level of the food chain, followed by primary, secondary and tertiary consumers. Hence option a is correct.
Consumers are dependent on producers for food, as they cannot fix sunlight energy. It includes herbivores that eat plants, carnivores that eat herbivores and other animals. Hence option b and c are incorrect.
Herbivores (primary consumers like rat) are organisms present at the second trophic level feeding on producers. Carnivores (snake) eat herbivores and come later in the food chain. Hence are known as secondary consumers. They occupy the third trophic level which is further eaten up by top carnivores (hawk) at the fourth trophic level called secondary carnivores or tertiary consumers.
Figure : Grazing food chain
Decomposers are organisms like bacteria and fungi that feed on dead and decaying material called detritus and release nutrients back into the environment. They are a part of the detritus food chain (DFC). Hence option d is incorrect.
A food chain refers to the order of events in an ecosystem, where one living organism eats another organism, and later that organism is consumed by another larger organism. It also explains the feeding pattern or relationship between living organisms in a food chain.
Different organisms occupy different levels in the food chain and each level is referred to as trophic levels.
The ultimate source of energy is sunlight. Producers (green plants) are organisms, synthesising their own food by photosynthesis. It is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar. They present at the bottom or first trophic level of the food chain, followed by primary, secondary and tertiary consumers. Hence option a is correct.
Consumers are dependent on producers for food, as they cannot fix sunlight energy. It includes herbivores that eat plants, carnivores that eat herbivores and other animals. Hence option b and c are incorrect.
Herbivores (primary consumers like rat) are organisms present at the second trophic level feeding on producers. Carnivores (snake) eat herbivores and come later in the food chain. Hence are known as secondary consumers. They occupy the third trophic level which is further eaten up by top carnivores (hawk) at the fourth trophic level called secondary carnivores or tertiary consumers.
Figure : Grazing food chainDecomposers are organisms like bacteria and fungi that feed on dead and decaying material called detritus and release nutrients back into the environment. They are a part of the detritus food chain (DFC). Hence option d is incorrect.
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