Question

Which of the following are excretory products in animals?

• A. Urea
• B. Uric acid
• C. Ammonia
• D. All of the above

Answer 1

The correct option is D All of the above

In animals, the main excretory products are, Ammonia- protozoans, crustaceans, platyhelminths, cnidarians, poriferans, echinoderms, fishes, larvae/tadpoles of amphibians are ammonotelic. Urea -cartilaginous fish, few bony fishes, adult amphibians and mammals including humans are uricotelic, Uric acid-terrestrial arthropods (including insects), lizards, snakes, and birds are uricotelic.

So, the correct answer is 'All the above'