What is plankton?

What is plankton?

• A. Small organisms that drift in water and are a crucial food source for many aquatic animals.
• B. Large nektonic predators that actively swim.
• C. Benthic organisms living on the seafloor.
• D. Floating debris that accumulates in currents.

Answer: (A)

Plankton are organisms that drift with water movement rather than actively swimming. They’re typically small and include two main groups: phytoplankton, the microscopic plants that photosynthesize, and zooplankton, tiny animals that feed on other organisms or organic particles. Because they float with currents and become concentrated in productive areas, they form the base of many aquatic food webs, serving as the crucial food source for a wide range of larger animals, from small fish to whales. This distinguishes them from nekton, which are active swimmers like larger fish and squid; from benthos, which live on or near the seafloor; and from floating debris, which is nonliving material.

Plankton are organisms that drift with water movement rather than actively swimming. They’re typically small and include two main groups: phytoplankton, the microscopic plants that photosynthesize, and zooplankton, tiny animals that feed on other organisms or organic particles. Because they float with currents and become concentrated in productive areas, they form the base of many aquatic food webs, serving as the crucial food source for a wide range of larger animals, from small fish to whales. This distinguishes them from nekton, which are active swimmers like larger fish and squid; from benthos, which live on or near the seafloor; and from floating debris, which is nonliving material.