Free-floating algae is also known as which of the following?

Free-floating algae are commonly referred to as phytoplankton. This term specifically describes the microscopic algae that drift in the water column and are a crucial component of aquatic ecosystems. Phytoplankton photosynthesize, providing a vital source of oxygen and serving as the foundational food source for many aquatic organisms, effectively supporting the entire food web in freshwater and marine environments.

Macroalgae, on the other hand, refers to larger algae typically attached to substrates rather than floating freely. Periphyton is a community of organisms, including algae, that attach to submerged surfaces like rocks or plants, while zooplankton consists of small aquatic animals that feed on phytoplankton and other microscopic organisms. Understanding these distinctions is essential for aquatic pest management, as each type plays a different role in the ecosystem.