Select the CORRECT statements regarding periplaneta americana.
I. A ring of 6-8 blind tubules called hepatic or gastric caeca is present at the junction of foregut and midgut.
II. The lower lip is called labium and the upper lip is called the labrum.
III. Tegmina are mesothoracic wings that are opaque, leathery, and dark.
IV. It has a vision known as a mosaic vision with more resolution but less sensitivity.

Options

A. I,II and III only
B. I,III and IV only
C. I,II,III and IV only
D. III and IV

Answer

To solve the question regarding the correct statements about Periplaneta americana (the American cockroach), let's analyze each statement step by step.

### Step 1: Analyze Statement I
**Statement I:** A ring of 6-8 blind tubules called hepatic or gastric caeca is present at the junction of foregut and midgut.

- The cockroach's digestive system is divided into three parts: foregut, midgut, and hindgut.
- At the junction of the foregut and midgut, there are indeed 6-8 blind tubules known as gastric caeca. These structures are involved in the secretion of digestive enzymes.
- **Conclusion:** This statement is **correct**.

### Step 2: Analyze Statement II
**Statement II:** The lower lip is called labium and the upper lip is called the labrum.

- In the anatomy of the cockroach, the lower lip is referred to as the labium, while the upper lip is called the labrum.
- **Conclusion:** This statement is **correct**.

### Step 3: Analyze Statement III
**Statement III:** Tegmina are mesothoracic wings that are opaque, leathery, and dark.

- Cockroaches have two pairs of wings. The forewings are called tegmina, which are indeed mesothoracic and are characterized as opaque and leathery.
- The hindwings are membranous and used for flight.
- **Conclusion:** This statement is **correct**.

### Step 4: Analyze Statement IV
**Statement IV:** It has a vision known as a mosaic vision with more resolution but less sensitivity.

- Cockroaches possess compound eyes that provide a mosaic vision. However, this type of vision is characterized by **more sensitivity and less resolution**.
- The statement incorrectly describes the characteristics of mosaic vision.
- **Conclusion:** This statement is **incorrect**.

### Final Conclusion
Based on the analysis:
- **Correct Statements:** I, II, and III.
- **Incorrect Statement:** IV.

Thus, the correct answer is that statements I, II, and III are correct regarding Periplaneta americana.

---