Question

The excretory organ in molluscs is the

• A. malphigian tubule
• B. organ of Bojanus
• C. flame cells
• D. protonephridia

Answer 1

The correct option is B

organ of Bojanus

The correct option is B:

Explanation of the correct option:

Option B:

1. Organisms belonging to Phylum Mollusca excrete with the help of metanephridia.
2. In some molluscs, the organ of Bojanus is the metanephridia which act as a kidney and performs excretion.
3. Other organs perform excretion for different organisms.

Explanation of the incorrect option:

Option A:

Malphigian tubules are the excretory organs seen in mammals.

Option C:

Flame cells are hollow cells that have a tuft of vibratile cilia and are part of some lower invertebrate excretory system like platyhelminthes.

Option D:

1. Protonephridium is an excretory tube that lacks an internal opening.
2. It is found in Platyhelminthes, Rotifers, and some Chordates.

Final answer: The excretory organ in molluscs is the organ of Bojanus.