Question

Study the following and choose the incorrect combinations:
I. Phylum: Porifera, Special cells: Lasso cells, Example: Spongilla
II. Phylum: Cnidaria, Special cells: Stinging cells, Example: Hydra
III. Phylum: Ctenophora, Special cells: Choanocytes, Example: Pleurobrachia
IV. Phylum: Platyhelminthes, Special cells: Flame cells, Example: Fasciola

• A. I, III
• B. II, IV
• C. I, IV
• D. II, III

Hint:

Porifera = choanocytes; Cnidaria = cnidocytes; Ctenophora = colloblasts; Flame cells = Platyhelminthes. Always match cell type with correct phylum.

Answer 1

The Correct Option is A

- Lasso cells are characteristic of Cnidaria, not Porifera.
- Ctenophora has colloblasts, not choanocytes (which belong to Porifera).
Hence, I and III are incorrect combinations. II and IV are correct.