Periplaeta americana is also known as Americal cockroach. Which of the following information abut it is incorrect?

Options

A. Number of wings = 2 pairs
B. Number of legs = 3 pairs
C. Type of circulatory system = closed type
D. Number of ovaries = 2

Answer

To determine which information about Periplaneta americana (American cockroach) is incorrect, we will analyze the characteristics of this organism step by step.

### Step-by-Step Solution:

1. **Identify the Organism**: Periplaneta americana is commonly known as the American cockroach. It belongs to the class Insecta and the phylum Arthropoda.

2. **Examine the Characteristics**:
- **Number of Wings**: American cockroaches have two pairs of wings. This is correct as they possess one pair of forewings (which are larger and used for flying) and one pair of hind wings (which are smaller).

- **Number of Legs**: They have three pairs of legs, which is also correct. As an insect, they have a total of six legs.

- **Circulatory System**: The circulatory system of Periplaneta americana is open type, not closed. In an open circulatory system, the blood (hemolymph) is not confined to blood vessels and flows freely within the body cavity. This statement is incorrect.

- **Number of Ovaries**: Female American cockroaches have two ovaries, which is correct.

3. **Conclusion**: The incorrect information about Periplaneta americana is that it has a closed type of circulatory system. The correct statement is that it has an open type of circulatory system.

### Final Answer:
The incorrect information is that the circulatory system is closed type.

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