Why terrestrial animals excrete lesser toxic nitrogenous waste?

Terrestrial adaptation necessitated the production of lesser toxic nitrogenous wastes like urea and uric acid for the conservation of water. Hence, due to less availability of water on land, and in order to minimise water loss, terrestrial organism adapted themselves accordingly.

How is urea produced in animals?

The urea cycle is the primary mechanism by which mammals convert ammonia to urea. Urea is made in the liver and excreted in urine. The overall chemical reaction by which ammonia is converted to urea is 2 NH3 (ammonia) + CO2 + 3 ATP + H2O → H2N-CO-NH2 (urea) + 2 ADP + 4 Pi + AMP.

How do animals produce nitrogenous waste?

ammonia – the direct waste produced as a byproduct of protein metabolism. Produced by all animals. Because of its toxicity, many animals convert ammonia into a less toxic form. Thus, reptiles and birds during their stage of development within a shelled egg, produce uric acid as their final form of nitrogenous waste.

Where does the waste product urea come from?

Urea is produced in the liver and is a metabolite (breakdown product) of amino acids. Ammonium ions are formed in the breakdown of amino acids.

Why should animals excrete waste matter?

Answer: The waste materials produced during the metabolic activities are toxic to the body and must not be accumulated inside, and therefore it has to be excreted out from the body by the process of excretion.

Why urea is less toxic than ammonia?

Although it requires metabolic energy to build, it also is less toxic than ammonia, and it requires less water to flush from the system. urea – two nitrogens per molecule; less toxic; requires less water to flush. uric acid – four nitrogens per molecule; non-toxic; requires very little water to flush.

Why do terrestrial animals convert ammonia to urea before excretion?

Nitrogenous wastes tend to form toxic ammonia, which raises the pH of body fluids. Terrestrial organisms have evolved other mechanisms to excrete nitrogenous wastes. The animals must detoxify ammonia by converting it into a relatively nontoxic form such as urea or uric acid.

Do mammals excrete urea?

Nitrogenous wastes in the body tend to form toxic ammonia, which must be excreted. Mammals such as humans excrete urea, while birds, reptiles, and some terrestrial invertebrates produce uric acid as waste.

Why is urea a waste product?

Urea (also known as carbamide) is a waste product of many living organisms, and is the major organic component of human urine. This is because it is at the end of chain of reactions which break down the amino acids that make up proteins. An adult typically excretes about 25 grams of urea per day. …

Why it is necessary to excrete the waste product?

Q12) Why is it necessary to excrete waste products? When our cells perform their functions, certain waste products are released. These are toxic for our body and hence need to be removed from the body. If they are not removed, they can cause certain problems in our body and can even cause some diseases.

Why is excretion necessary in animals?

exceration is necessary in animal because when animal eat food the then unnecessary material is thrown out by excretion system if it not present the wasted material collected in the animal body and damaged the body internal part as it will die.