The blood of haemolymph of cockroach does not play a role in respiration because

Options

A. It consists of different types of cells
B. The blood fills spaces i.e. sinuses are present
C. It is devoid of a respiratory pigment
D. The body cavity called haemocoel is present

Answer

To answer the question "The blood of haemolymph of cockroach does not play a role in respiration because," we can follow these steps:

### Step 1: Understand the Composition of Haemolymph
Haemolymph is a fluid found in cockroaches and other arthropods. It is often described as a white-colored fluid. This is an important characteristic because it indicates the absence of certain components that are typically involved in respiration.

**Hint:** Consider what components are usually present in blood that aid in respiration.

### Step 2: Identify the Role of Hemoglobin
In many animals, blood contains hemoglobin, a respiratory pigment that binds oxygen and facilitates gas exchange. In the case of cockroaches, haemolymph does not contain hemoglobin.

**Hint:** Think about how the presence or absence of hemoglobin affects the ability of a fluid to transport oxygen.

### Step 3: Recognize the Function of the Tracheal System
Cockroaches possess a tracheal system for respiration, which is a network of tubes that directly deliver oxygen to tissues. This system operates independently of the haemolymph.

**Hint:** Reflect on how different respiratory systems can function without relying on blood for gas exchange.

### Step 4: Conclude the Reason for Lack of Respiratory Role
Since haemolymph lacks hemoglobin and the cockroach has a specialized tracheal system for respiration, the haemolymph does not play a role in the respiratory process.

**Hint:** Summarize the key points about the composition of haemolymph and the respiratory adaptations of cockroaches.

### Final Answer
The blood of haemolymph of cockroach does not play a role in respiration because it is devoid of respiratory pigments like hemoglobin, which are essential for gas exchange. Instead, respiration is carried out by the tracheal system in cockroaches.