Which one of the following statements in true for cockroach?

Options

A. The number of ovarioles in each ovary are ten.
B. The larval stage is called caterpillar
C. Anal styles are absent in females
D. They are ureotelic

Answer

To determine which statement is true for cockroaches, we can analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Examine the First Statement**:
- The statement claims that the number of ovarioles in each ovary is 10.
- **Fact Check**: In cockroaches, each ovary contains 8 ovarioles, not 10.
- **Conclusion**: This statement is **false**.

2. **Examine the Second Statement**:
- The statement claims that the larval stage is called a caterpillar.
- **Fact Check**: The larval stage of a cockroach is called a nymph, not a caterpillar. Caterpillars are the larval stage of butterflies and moths.
- **Conclusion**: This statement is **false**.

3. **Examine the Third Statement**:
- The statement claims that anal styles are absent in females.
- **Fact Check**: In female cockroaches, anal styles (small appendages) are indeed absent. This is a distinguishing feature between male and female cockroaches.
- **Conclusion**: This statement is **true**.

4. **Examine the Fourth Statement**:
- The statement claims that cockroaches are euryotallic.
- **Fact Check**: The term "euryotallic" refers to organisms that can tolerate a wide range of environmental conditions, particularly in terms of salinity. While cockroaches are adaptable, this statement does not specifically pertain to their biological classification or characteristics.
- **Conclusion**: This statement is **false**.

### Final Answer:
The correct statement about cockroaches is that **anal styles are absent in females** (Third Statement).

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