Which of the following is a Primary Consumer in an aquatic food chain?

Explanation:

Food Chain is a diagram that shows how food energy moves from one organism to another in a given environment. In other words, it is the chronological order of who eats whom in a biological community.

Aquatic food chain:

• Primary consumers are herbivores, they eat plants.
• In our aquatic ecosystem example, zooplankton feeding on phytoplankton occupy the primary consumer trophic level.

Phytoplankton →Zooplankton  → Small Fish → Large Fish → Whale

Phytoplankton: A mix of algae, the primary producer

Zooplankton: Small floating elements consuming the phytoplankton, the primary consumer

Hence the correct option is Zooplankton