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Question
Which of the following organisms will occupy the fourth trophic level in a grazing food chain?
Which of the following organisms will occupy the fourth trophic level in a grazing food chain?
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Solution
The correct option is A Carnivores
The process of transfer of energy from producers through a series of organisms, i.e from primary consumers to secondary consumers to tertiary consumers by the process of eating and being eaten constitute a food chain.
Different organisms occupy different levels in the chain and each level is referred to as trophic levels.
Trophic levels can be understood with the help of the diagram given below.
Producers like green plants come at the bottom or first trophic level T1, they are able to synthesise their food utilising the energy coming from the sun. So option c and d are incorrect.
Consumers are dependent on plants for food. It includes herbivores that eat plants as primary consumers and occupy the second trophic level T2. For example, a grasshopper feeding on producers (plants).
Herbivores are further eaten up by carnivores called secondary consumers or primary carnivores, present at third trophic level T3. For example, frogs consuming the grasshoppers. So option b is incorrect.
The secondary consumer is further eaten up by top carnivores at fourth trophic level T4 called secondary carnivores or tertiary consumers. For example, snakes which feed on frogs.
Generally trophic level 4 and higher are occupied by carnivores in a grazing food chain. Hence option a is correct.
The process of transfer of energy from producers through a series of organisms, i.e from primary consumers to secondary consumers to tertiary consumers by the process of eating and being eaten constitute a food chain.
Different organisms occupy different levels in the chain and each level is referred to as trophic levels.
Trophic levels can be understood with the help of the diagram given below.
Producers like green plants come at the bottom or first trophic level T1, they are able to synthesise their food utilising the energy coming from the sun. So option c and d are incorrect.
Consumers are dependent on plants for food. It includes herbivores that eat plants as primary consumers and occupy the second trophic level T2. For example, a grasshopper feeding on producers (plants).
Herbivores are further eaten up by carnivores called secondary consumers or primary carnivores, present at third trophic level T3. For example, frogs consuming the grasshoppers. So option b is incorrect.
The secondary consumer is further eaten up by top carnivores at fourth trophic level T4 called secondary carnivores or tertiary consumers. For example, snakes which feed on frogs.
Generally trophic level 4 and higher are occupied by carnivores in a grazing food chain. Hence option a is correct.
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