The size of mesoplankton:

Correct option is C

Correct Answer: (c) 0.5 – 1 mm
Explanation:
→ In the context of the provided options, mesoplankton is here taken as organisms in the 0.5–1 mm size range (many zooplanktonic copepodites and larvae fall in this class).
→ Note: plankton size categories vary by convention (some definitions use 0.2–20 mm for meso), but answer follows the given key.
Information Booster:
→ Size classification helps select appropriate plankton nets and interpret trophic dynamics.
Additional Information (Other Options):
(a),(b),(d): either overlap other size classes or are outside the narrow range chosen.