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Question

According to the food web given below, the bear is a:


A
Primary consumer
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B
Secondary consumer
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C
Both primary and secondary consumer 
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D
Primary, secondary and tertiary consumer
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Solution

The correct option is D Primary, secondary and tertiary consumer
When the bear eats berries, its a primary consumer as it directly feeds on plants.
When it eats rodents, it becomes a secondary consumer. Rodents feed on grass, so rodents are the primary consumers in that particular food chain.
When the bear eats a salmon, the bear is functioning as a tertiary consumer as salmons are secondary consumers that feed on zooplankton (primary consumers). These zooplanktons feed on phytoplanktons which are the producers of an aquatic ecosystem.

Biology

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