Haemolymph in cockroach is devoid of

Options

A. Plasma
B. Haemocytes
C. Amino acids
D. Respiratory pigment

Explanation

**Step-by-Step Solution:**

1. **Understanding Hemolymph**: Hemolymph is the fluid that serves a similar function to blood in cockroaches and other arthropods. Unlike human blood, which is red due to the presence of hemoglobin, hemolymph is colorless.

2. **Components of Hemolymph**: Hemolymph consists of clear plasma and various cellular components. The plasma contains about 70% water, along with amino acids, uric acid, proteins, sugars, fats, and salts (sodium, potassium, calcium, and magnesium).

3. **Presence of Hemocytes**: Hemolymph contains numerous white blood cells known as hemocytes, which play roles in immune functions.

4. **Absence of Respiratory Pigment**: A key characteristic of hemolymph is that it lacks respiratory pigments (like hemoglobin). This absence means that hemolymph does not participate in gas exchange.

5. **Gas Exchange Mechanism**: In cockroaches, gas exchange occurs through a system of tracheae (air tubes) that directly connect to the atmosphere, allowing oxygen to diffuse into the tissues without the need for hemolymph to carry it.

6. **Conclusion**: Therefore, the correct answer to the question is that hemolymph in cockroaches is devoid of respiratory pigment.

**Final Answer**: Hemolymph in cockroaches is devoid of respiratory pigment.

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