Question

Uric acid is the chief nitrogenous component of the excretory products of:

A. Frog
B. Man
C. Earthworm
D. Cockroach

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Answer

To determine which organism has uric acid as the chief nitrogenous component of its excretory products, we need to understand how different animals excrete waste. Animals can be categorized based on their excretory products:

  1. Ureotelic animals: These animals excrete urea as the primary waste product. Examples include humans and frogs.
  2. Ammonotelic animals: These animals excrete ammonia. Examples include many aquatic organisms which excrete ammonia directly into the water.
  3. Uricotelic animals: These animals excrete uric acid as their primary waste product. Examples include birds, reptiles, and insects like the cockroach.

Let’s consider the options given in the question:

  1. Frog: Frogs excrete urea as their primary nitrogenous waste. Therefore, they are ureotelic.
  2. Man: Humans also excrete urea as their primary nitrogenous waste, making them ureotelic too.
  3. Earthworm: Earthworms excrete urea as well as ammonia, depending on their environment. They can be both ureotelic and ammonotelic.
  4. Cockroach: Cockroaches excrete uric acid as their primary nitrogenous waste product, making them uricotelic.

Thus, the organism that has uric acid as the chief nitrogenous component of its excretory products is the cockroach.

Therefore, the correct answer is:

D. Cockroach


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