Question

in this food web, which of the following organisms are herbivores? coral phytoplankton parrotfish zooplankton unicornfish shark

Explanation:

• Coral: It is a carnivore as it feeds on zooplankton.
• Phytoplankton: It is a producer (autotroph), not a herbivore.
• Parrotfish: It feeds on coral (which is a living organism, but in the context of the food - web, if we consider the general role, and also some parrotfish species graze on algae that grow on coral. But in a strict sense, if we assume the food - web shows it consuming coral (which is an animal - like organism in a symbiotic relationship with algae), but in some ecological classifications, parrotfish can be considered as herbivores when they graze on the algal part of the coral - symbiosis.
• Zooplankton: It is a consumer (heterotroph), but it is a primary consumer that can be carnivorous (feeding on phytoplankton is more of a detritivore or filter - feeder in some cases, but generally zooplankton can be both, but not a typical herbivore).
• Unicornfish: It is an herbivore as it feeds on phytoplankton.
• Shark: It is a carnivore as it feeds on other fish (unicornfish and parrotfish in this food - web).

Answer:

Unicornfish