Question

‘Organs of Bojanus' is a characteristic feature of –
A. Porifera
B. Mollusca
C. Platyhelminthes
D. Hemichordata

Answer 1

Hint: These organs are related to the excretory system.

Complete answer:
The organs of Bojanus are excretory glands that serve the function of kidneys in some of the Mollusca.
These organs of Bojanus are also called metanephridia which are found in some mollusks.
These are the pair of nephridia excretory organs of bivalve mollusks situated on each side of the body just below the pericardium.

Additional information
 - Mollusks have a well developed excretory system.
- They have tubular nephridia which function as kidneys that collect liquid wastes from the coelom.
- These liquid wastes are then dumped into the mantle cavity and then later are pumped out of the shell.
- This organ of Bojanus filters wastes from the blood of the organism.
- These organs also help in maintaining the balance of fluids within the body.
- Some of the mollusks have other excretory systems called Keber's organs.
- These keber’s organs are called a pericardial gland.
- These keber’s organs are large, reddish-brown glandular masses.
- It is situated anterolateral to the pericardium into which it discharges the waste material.
- The waste material here is collected from the kidney.

So, the correct answer is Mollusca.

Note: Mollusca is the second largest phylum of invertebrate animals after the Arthropoda. Their characteristic feature is a fleshy mantle that secretes the calcareous shell.