Periplaneta americana is a very common species of cockroach. It is
(a) Ureotelic
(b) Uricotelic
(c) Ammonotelic
(d) Guanotelic

Options

A. Ureotelic
B. Uricotelic
C. Ammonotelic
D. Guanotelic

Answer

To solve the question regarding the nitrogenous waste excretion in Periplaneta americana (the common cockroach), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**: The question mentions Periplaneta americana, which is a common species of cockroach.

2. **Understand Excretion in Cockroaches**: Cockroaches have a specific way of excreting nitrogenous waste. They utilize a structure known as Malpighian tubules for this purpose.

3. **Function of Malpighian Tubules**: These tubules are responsible for the absorption of nitrogenous waste products from the hemolymph (the blood equivalent in insects). The cells lining these tubules are glandular and ciliated, which aids in the absorption process.

4. **Type of Nitrogenous Waste Produced**: The absorbed nitrogenous waste is converted into uric acid, which is a less toxic form of nitrogenous waste. This conversion is crucial as it allows the organism to conserve water.

5. **Excretion Process**: The uric acid is then excreted out of the body through the hindgut of the cockroach.

6. **Conclusion**: Based on the above information, we can conclude that Periplaneta americana is a uricotelic organism because it excretes nitrogenous waste in the form of uric acid.

### Final Answer:
(b) Uricotelic

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