Excretory Products and their Elimination Test - 10

An ammonotelic organism excretes nitrogenous waste as soluble ammonia. Most of the aquatic animals including protozoans, crustaceans, platyhelminths, cnidarians, poriferans, echinoderms, fishes, larvae / tadpoles of amphibians are ammonotelic.
Among the given options, Bony fish is ammonotelic.

Uric acid is the end product of purine metabolism.

Brush bordered epithelium is found in PCT.

CO₂ is the most important gaseous waste and is eliminated through the lungs.

Both insects and spiders eliminate their nitrogenous wastes as compounds insoluble in water in the form of uric acid and guanine. They have mechanisms to convert nitrogenous wastes to guanine in the cells. They do so to conserve water. However, it requires a lot of energy.

Trimethylamine oxide (TMAO) is a common and compatible osmolyte in muscle tissues of marine organisms that is often credited with counteracting protein-destabilizing forces. In marine teleost fishes, trimethylamine oxide occurs as a waste product in large quantities. It is soluble in water, and is non-toxic in nature.

The process of excretion of nitrogenous waste in the form of ammonia is called ammonotelism.

The excretory organs of cockroaches are malpighian tubules.

Nephrostome is the funnel-shaped inner opening of a nephridium that is lined with cilia and allows water and waste to enter from the body cavity. It is the upper part of nephridia.

Spleen is a lymphatic tissue and stores blood. It plays no role in excretion.