Question

Solenocytes and nephridia are respectively found in

• A. Plathyelminthes and Annelids
• B. Annelids and Nematoda
• C. Cnidaria and Mollusca
• D. Mollusca and Echinodermata

Answer 1

The correct option is A Plathyelminthes and Annelids

• Solenocyte or flame cell is a mesoderm-derived elongated cell with a constantly moving long flagellum.
• It makes up the excretory system of lower invertebrates, for example, Platyhelminthes.
• Most annelids and molluscs have nephridia, which are tubules open at both sides.
• The inner opening opens into coelom while the outer open outside as a nephridiopore.
• Nematodes have a well-developed digestive system with a separate mouth and anus.
• Cnidarians excrete gaseous waste by diffusion and solid waste through the opening of a gastrovascular cavity.
• Echinoderms remove waste through the finger-like extension of coelom called papulae.

Thus, the correct answer is option A.