Question

Pericardial gland of Unio is called as
A)Johnston's organ
B)Organ of Bojanus
C)Keber's organ
D)None of the above

Answer 1

It is a gland-like structure which is present in front of the pericardium. This organ helps in the removal of nitrogenous waste. It is a large reddish-brown, glandular mass also known as a pericardial gland.

Complete answer:
-The excretory system of unio involves- a pair of kidneys or organs of Bojanus and the Keber’s organ.
-Keber's organ or pericardial gland is present in front of the pericardium.it is a type of excretory organ present in the union. It is made up of the epithelium of the pericardium. It comprises a large reddish-brown glandular mass to help in discharging the waste into the pericardium.
-the nitrogenous base is generally ammonia and amino compounds and also found that it has traces of urea and uric acid.

Additional Information: The organ of Bojanus - a kidney or nephridia is the chief excretory organ of the union. It is also known as the organ of the bojanus.
-The organ of the bojanus is named after the name of a discoverer. It is located one on each side of the body of the unio below the pericardium.
-Each kidney form using the structure and comprises a tube bent on itself. Tube of the lower limb is a
a thick-walled, spongy, brown-colored glandular part of the kidney, and the tube of the upper limb is called urinary bladder consisting of a thin-wall, is non-glandular and they are ciliated.
-The nitrogenous excretory waste from the pericardial fluid and the blood which is supplied to them is removed by the granular part of the kidney.
-The large quantity of water is also removed by the kidney to maintain their blood concentration level. Therefore it also has the osmoregulatory function with the excretory function.
Johnston's organ - is found in the insect's pedicel that is the second segment of the antenna. It is a collection of sensory cells. It also detects the motion of the flagellum.

So, the correct answer is,” Keber's organ”.

Note: -So, Keber's organ is present in the front of the pericardium which is responsible for the excretion of nitrogenous wastes. It is large, reddish-brown, and has a glandular mass.
-It is also situated over the auricle surfaces on the pericardium or in both positions.
-It is similar to the function of the kidney.