Planktonic organisms that spend part of their life in planktonic form, and the rest of their life as either benthos or nekton are called:

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Meroplankton are planktonic organisms that spend only part of their life in the planktonic form and the rest of their life as either benthos or nekton. The other options do not fit this definition. Bacterioplankton are bacteria that are planktonic throughout their life cycle. Holoplankton are planktonic organisms that remain in the planktonic form throughout their entire life cycle. Macroplankton are large planktonic organisms, and zooplankton are planktonic animals.

Planktonic Organisms That Spend Part of Their Life in Planktonic