Question

Which is uricotelic?

• A. Earthworms
• B. Cockroach
• C. Frog
• D. Humans

Answer 1

The correct option is B

Cockroach

The correct option is option B.

Explanation of correct option:

1. The term "uricotelic animals" refers to organisms that expel uric acid, a nitrogenous waste product produced within the body.
2. Most insects, birds, and reptiles, including pigeons, lizards, and cockroaches, use this mode of excretion.
3. Out of the given options, the cockroach is a uricotelic organism.

Explanation of incorrect options:

Option A:

1. Earthworms' nephridia, an excretory organ, aids in the removal of wastes in the form of ammonia when there is an excess of water available.
2. They expel wastes in the form of urea when on land.
3. Earthworms are both ureotelic and ammoniotelic.

Option C:

1. In general, the adult amphibians generate urea, whereas the larval tadpoles excrete ammonia.
2. Tadpoles of frogs are ammoniotelic, which means they expel ammonia as a by-product of their nitrogenous waste.

Option D:

1. Humans are ureotelic organisms.
2. The nitrogenous wastes, such as salts, urea, and extra water, are removed from the blood by the kidneys in humans, which then expel them as urine.
3. The kidney's nephrons, which number in the millions, assist to do this.

Final answer: The cockroach is a uricotelic organism.