Which term describes planktonic organisms large enough to be seen with the naked eye, such as jellyfish?

• A. Holoplankton
• B. Macroplankton
• C. Meroplankton
• D. Microbial Loop

Answer: (B)

Macroplankton is the term for planktonic organisms large enough to be seen with the naked eye, such as jellyfish. This size-based category groups bigger drifting organisms separate from the microscopic microplankton or nanoplankton. The other terms describe life-cycle timing (holoplankton spend their entire life as plankton; meroplankton are planktonic only as larvae) or a trophic concept (the microbial loop), not size.