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Consider the following aquatic food chain: Phytoplankton Zooplankton Small fishes Large fishes Which of the given organisms represents the primary consumer in this ecosystem?

Options

  1. APhytoplankton
  2. BZooplankton
  3. CSmall fishes
  4. DLarge fishes

Correct answer

B. Zooplankton

Step-by-step solution

In an aquatic ecosystem, phytoplankton are the primary producers occupying the first trophic level. Zooplankton feed directly on phytoplankton, making them the primary consumers at the second trophic level. Small fishes and large fishes act as secondary and tertiary consumers, respectively. Answer: Zooplankton

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