Question

Excretory organs of urochordates are
A. Neural gland
B. Pyloric gland
C. Nephrocytes
D. None of the above

Answer 1

The urochordate, a member of the subphylum Tunicata, is a marine invertebrate mammal. It is part of the Chordata, a phylum that includes dorsal nerve cords and notochords in all species. By reducing metabolic waste and maintaining the proper quantities of water, salts, and nutrients, excretory systems control the chemical composition of body fluids.

Complete answer:
The pyloric glands secrete mucus which helps to dilute acids and enzymes, coat the stomach and protects it from self-digestion. Nephrocytes are specialized cells, particularly in arthropods, whose function involves waste or excretory products being accumulated or created.
A remarkable community of species and usually very attractive and photogenic, the urochordates or tunicates are. All the participants are sailors. They contain three groups, the larvaceans and the thaliaceans, the ascidians or sea squirts. In a more-or-less transparent tunic, the body is enclosed. No special excretory organs appear to be present. Nitrogenous waste is excreted as ammonia, which by the exhalant flow of water and through diffusion, can be easily taken away from the general body surface.

Hence, the correct answer is option (A).

Note: For their fine structural features and enzyme cytochemistry, the cells forming the neural gland have been studied. The shape of the gland cells is either cuboidal or irregular. They are full of tiny vesicles, some of which are pinocytotic, as well as larger vacuoles; as their form decreases in regularity, they become gradually vacuolated. Glycogen deposits accumulate at the same time and the cisternae of the endoplasmic reticulum are distended.