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Q.
Free floating organisms on sea surface are
Organisms and Populations
Solution:
Planktons are organisms living on the surface layers of the aquatic habitat which float or drift passively along with the water currents due to either absence of locomotory organs or presence of weak locomotory organs. Planktons are of two types - phytoplankton (photosynthetic plankton) and zooplankton (phagotrophic plankton).