Question

1. which of the following is a stinging cell that is a distinguishing feature of all cnidarians? polyp flagella planula cnidocyte

Explanation:

• Polyp is a body form of cnidarians, not a stinging cell.
• Flagella are whip - like structures for movement, not unique to cnidarians as stinging cells.
• Planula is a larval form of cnidarians, not a stinging cell.
• Cnidocytes are specialized stinging cells that are a distinguishing feature of all cnidarians.

Answer:

D. cnidocyte