Cockroach and other insects have blood which :

Options

A. Resembles human blood in colour
B. Has RBCS
C. Circulates through arteries and veins
D. Circulates through an open system

Answer

**Step-by-Step Solution:**

1. **Understanding the Blood Composition in Cockroaches:**
- Cockroaches and other insects have a type of blood known as hemolymph.
- Hemolymph is primarily composed of about 90% watery fluid and 10% hemocytes (the blood cells).

2. **Analyzing the Options:**
- **Option 1: Resemble human blood in color.**
- This option is incorrect. Human blood is red due to the presence of hemoglobin, which is not found in hemolymph. Therefore, hemolymph does not resemble human blood in color.

- **Option 2: Has red blood cells (RBCs).**
- This option is also incorrect. Insects do not have red blood cells like humans. Instead, they have hemocytes which are different from RBCs. Hemolymph is a clear fluid, lacking the red pigment associated with RBCs.

- **Option 3: Circulate through arteries and veins.**
- This option is incorrect as well. Cockroaches have an open circulatory system, meaning their blood (hemolymph) does not circulate through arteries and veins like in a closed circulatory system. Instead, it flows freely in the body cavity known as hemocoel.

- **Option 4: Circulate through an open system.**
- This option is correct. Insects, including cockroaches, have an open circulatory system where hemolymph circulates through the hemocoel and bathes the organs directly.

3. **Conclusion:**
- The correct answer is that cockroach and other insects have blood (hemolymph) that circulates through an open system.