Question

A Malpighian tubule empties urine into the
A. Gut
B. Coelom
C. Lymph
D. Ureters

Answer 1

Hint: The osmoregulatory and excretory system found in arthropods like myriapod, insects are known as the Malpighian tubule system. The Malpighian tubule is responsible for the formation of pre-urine. Malpighian tubule numbers vary according to the species.

Complete answer:
Malpighian tubules, a slender tubular structure found in the alimentary canal (posterior region). Of the Arthropoda. It comprises a single cell layer and joins the alimentary canal by its proximal end between the hindgut and midgut junction. It is associated with an accessory muscular structure that is responsible for the tubule content into the hemolymph.
Malpighian tubules wall transport the nitrogenous waste and electrolyte. It diffuses the urea and amino acid. The active pump mechanism diffuses out the ions like sodium and potassium through the tube wall. The formed urine was then transferred to the hindgut with digested food. Then precipitation of uric acid occurs and the rectum absorbs the sodium and potassium ions and water by osmosis. Created uric acid ten mixed with stool and excreted out.
So, the correct answer is “Option A”.

Note:
Thearthropoda comprises nitrogenous waste like uric acid to excretion. There are 13types of excretory systems found in Arthropoda. These are nephridia, shell gland, coxal gland, Malpighian tubules, fat body and exoskeleton, hepatopancreas, midgut epithelium, intestinal caeca, pericardial cells oenocytes, and nephrocytes.