Which one is uricotelic ?a) Frogs and toadsb)Lizards and birdsc)Cattle, monkey and mand)MolluscsCorrect answer is 'B'. Can you explain this answer?

Question

Answer

Answer is B

Answer

It spells uric + otelic Those organisms who excrete most of their nitrogenous wastes in the form of uric acid. Birds and lizards are such organisms. Whereas, a ureotelic organism excretes excess nitrogen as urea. Urea is less toxic and needs less water in comparison to Ammonia. Ureotelic organisms include cartilaginous fish, few bony fishes, adult amphibians and mammals including humans.

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I think these types of questions are not given in NCERT .So is it necessary that these will come in exams

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Birds, reptiles, and most terrestrial arthropods, such as insects, are called uricothelic organisms because they convert toxic ammonia to uric acid or the closely-related compound guanine (guano), rather than urea.

Answer

Uricotelism is a method of nitrogen excretion in animals where the nitrogenous waste is converted into uric acid. Uric acid is a relatively less toxic compound and is less soluble in water compared to other nitrogenous wastes like ammonia or urea. This adaptation allows animals to conserve water and excrete waste in a concentrated form.

The correct answer to the question is option B: Lizards and birds. Let's discuss why lizards and birds are uricotelic animals in detail.

Lizards:
Lizards belong to the class Reptilia, which includes animals like snakes, turtles, and crocodiles. Reptiles are uricotelic because they have the ability to convert ammonia, a highly toxic waste product, into uric acid. This conversion takes place in the liver and helps in conserving water. Lizards, being reptiles, also follow this mechanism of nitrogen excretion and excrete uric acid as their primary nitrogenous waste.

Birds:
Birds belong to the class Aves and are also uricotelic. Like reptiles, birds have a high metabolic rate and produce a lot of nitrogenous waste in the form of ammonia. However, birds have evolved a unique adaptation to conserve water. They have special structures called uric acid glands located near their cloaca. These glands extract water from the urine, resulting in the production of highly concentrated uric acid. The uric acid is then excreted along with feces, forming a white, pasty substance called uric acid or urate.

This adaptation in birds allows them to conserve water in their bodies, which is crucial for their ability to fly. By excreting uric acid instead of urea or ammonia, birds can minimize water loss and maintain water balance in their bodies.

In summary, lizards and birds are uricotelic animals because they excrete waste in the form of uric acid. This adaptation helps them conserve water and is essential for their survival in their respective habitats.

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