Say whether each animal is ammonotelic, ureotelic or uricotelic…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Say whether each animal is ammonotelic, ureotelic or uricotelic.
- A pigeon.
- A rabbit.
- A tadpole, an aquatic amphibian, in a pond.
- A cockroach.
- A bony fish in a river.
Need a reminder? The key ideaShow
The three nitrogenous wastes are ammonia (one nitrogen atom in a molecule), urea (two) and uric acid (four). Ammonia is the most toxic and needs the most water. Uric acid is the least toxic and leaves as a paste. Ammonotelic animals are bony fishes, aquatic amphibians and aquatic insects. Ureotelic animals are mammals, many terrestrial amphibians and marine fishes. Uricotelic animals are reptiles, birds, land snails and insects. Use u, ammonia u, urea u and uric acid u.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) The pigeon is a bird. It is uricotelic.
Step 2. (b) The rabbit is a mammal. It is ureotelic.
Step 3. (c) An aquatic amphibian is ammonotelic.
Step 4. (d) The cockroach is an insect. NCERT lists insects as uricotelic.
Step 5. (e) A bony fish is ammonotelic.
Answer: (a) uricotelic; (b) ureotelic; (c) ammonotelic; (d) uricotelic; (e) ammonotelic.
Watch out. NCERT calls aquatic insects ammonotelic, and insects in general uricotelic. The cockroach lives on land.
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