Question

Flame cell/solenocytes are main excretory structures of

• A. Annelids
• B. Molluscs
• C. Platyhelminthes
• D. Echinodermates

Answer 1

The correct option is C

Platyhelminthes

The correct option is C:

Explanation of the correct option:

1. Solenocytes are elongated, flagellated cells that aid in the removal of nitrogenous wastes in most lower invertebrates.
2. Flame cells are another name for Solenocytes.
3. Solenocytes/flame cells are responsible for excretion and osmoregulation in Platyhelminthes.

Explanation of the incorrect options:

Option A:

1. Nephridia is the annelid's excretory organ.
2. In most annelids and molluscs, nephridia are tubules that are open on both sides.

Option B:

1. Nephridia is the mollusc's excretory organ.

Option D:

1. For excretion, echinoderms lack specialised excretory organs.
2. Diffusion, osmosis, or an active transport mechanism are all used to excrete waste in them.

Final answer: Flame cell/solenocytes are the main excretory structures of Platyhelminthes.