Which of the following is INCORRECT about a cockroach ?

Options

A. In females , a pair of spermatheca is present in the 6.. segment which opens into the genital chamber .
B. Male genital pouch is present dorsal to anus and contain male genital pore and gonapohysis.
C. The heart is differentiated into funnel shaped chambers with Ostia on either side .
D. Blood vascular system is open type in which blood from sinuses enter heart through ostia and pumped anteriorly.

Answer

To determine which statement about cockroaches is incorrect, we will analyze each provided statement one by one.

### Step 1: Analyze the first statement
**Statement:** In females, a pair of spermatheca is present in the sixth segment which opens into the genital chamber.

**Analysis:** This statement is correct. Female cockroaches do have a pair of spermathecae located in the sixth abdominal segment, and these structures open into the genital chamber, allowing for the storage of sperm.

### Step 2: Analyze the second statement
**Statement:** Male genital pouch is present dorsal to anus and contains male genital pore and gonapophysis.

**Analysis:** This statement is incorrect. The male genital pouch is actually located ventral to the anus, not dorsal. It contains the male genital pore and gonapophysis, but the positioning described in the statement is wrong.

### Step 3: Analyze the third statement
**Statement:** The heart is differentiated into funnel-shaped chambers with ostia on either side.

**Analysis:** This statement is correct. The heart of a cockroach is indeed divided into funnel-shaped chambers, and ostia (openings) are present on either side to allow blood to enter the heart from the hemolymph.

### Step 4: Analyze the fourth statement
**Statement:** The blood vascular system is open type in which blood from sinuses enters the heart through the ostia and is pumped entirely.

**Analysis:** This statement is also correct. Cockroaches have an open circulatory system where blood (hemolymph) flows freely through sinuses and enters the heart through ostia, which then pumps it throughout the body.

### Conclusion
After analyzing all the statements, we find that the incorrect statement about cockroaches is the second one.

**Final Answer:** The incorrect statement about a cockroach is option 2.

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