Question

Assertion: Urea is less toxic excretory substance when compared with uric acid.
Reason: birds and end insects are uricotelic animals.
A. If both the assertion and reason are true and reason is the correct explanation of the assertion
B. If both the assertion and reason are true but the reason is not the correct explanation of the assertion
C. If the assertion is true but the reason is
D. If the both assertion and reason are false
E. if the assertion is false but reason is true

Answer 1

Urea is more toxic than acid and fewer toxic to ammonia The formation of the urea takes place in the kidneys. Birds and insects are uricotelic animals. If not treated, urea can be harmful to the human body.

Complete answer:
Organisms which excrete nitrogenous wastes within the sort of urea are known as ureotelic organisms whereas the organisms which excrete nitrogenous wastes within the sort of uric acid are called uricotelic organisms.
Urea is a smaller amount harmful than ammonia and requires less water for elimination.
Examples: Certain types of bony fishes, amphibians (adult forma) and fish, chondrichthyan and the mammals which also includes humans.
Uricotelic animals – Species that excrete acid waste are called uricotelic organisms. acid is that the least poisonous and therefore the least soluble in water, relative to Ammonia and Urea.
Some of the Examples are- Birds, snakes and lizards.
All the species of reptiles, birds , and most terrestrial arthropods, like insects, are called uricotelic organisms because in their body toxic ammonia gets converted into uric acid or the closely-related compound guanine (guano), instead of urea.

So, the correct answer is option E.

Additional information: The primary organs related to excretion in case of insects are the Malpighian tubules, working in conjunction with the hind gut. Other haemocoelic structures, like the nephrocytes, fat-body and a few cephalic glands, have also been regarded within the past as excretory organs.

Note:
A chamber called a cloaca is present in case of birds, where digestive wastes, uric acid, and eggs or sperm go before leaving the body. While the acid is within the cloaca, birds can absorb a number of the water heaters. Some sea birds can even drink sea water and excrete the additional salt out of glands present in their eyes.