Temporary plankton is:

Correct option is B

Correct Answer: (b) Meroplankton
Explanation:
→ Meroplankton are organisms that are planktonic only for part of their life cycle (typically larvae of benthic invertebrates, fishes) and later settle to benthic or nektonic life.
→ Hence they are “temporary” plankton.
Information Booster:
→ Holoplankton remain planktonic throughout life (e.g., copepods).
Additional Information (Other Options):
(c) Pseudoplankton: organisms attached to floating objects.
(d) Euplankton: general synonym for true plankton (not temporary).