Which one of the following statements is 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

Explanation

To determine which statement is true for cockroaches, we will analyze each of the provided statements step by step.

### Step-by-Step Solution:

1. **Statement 1: The number of ovarioles in each ovary is 10.**
- Ovarioles are the structures in the ovaries of female cockroaches where eggs are developed.
- In cockroaches, each ovary actually contains **8 ovarioles**, not 10.
- **Conclusion:** This statement is **false**.

2. **Statement 2: The larval stage is called Caterpillar.**
- The term "Caterpillar" refers specifically to the larval stage of butterflies and moths, not cockroaches.
- The larval stage of cockroaches is known as a **nymph**, which resembles the adult form closely.
- **Conclusion:** This statement is **false**.

3. **Statement 3: Anal styles are absent in females.**
- Anal styles are present in male cockroaches and are involved in reproduction.
- Female cockroaches do not have these structures, making this statement accurate.
- **Conclusion:** This statement is **true**.

4. **Statement 4: They are ureotelic.**
- Ureotelic organisms excrete waste primarily in the form of urea.
- Cockroaches are actually **uricotelic**, meaning they excrete waste as uric acid, which is a more efficient way to conserve water.
- **Conclusion:** This statement is **false**.

### Final Answer:
The true statement for cockroaches is: **Anal styles are absent in females.**

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