Carbon dioxide cannot be transported with haemoglobin.

Answer

**Step-by-Step Solution:**

1. **Understanding the Statement**: The statement claims that carbon dioxide cannot be transported with hemoglobin. We need to evaluate the accuracy of this statement.

2. **What is Hemoglobin?**: Hemoglobin is a red pigment found in red blood cells (RBCs) that is responsible for transporting oxygen and carbon dioxide. It contains iron, which is crucial for its function.

3. **Transport of Oxygen**: Hemoglobin binds with oxygen to form oxyhemoglobin. Approximately 97% of oxygen is transported in the blood bound to hemoglobin, while about 3% is dissolved in plasma.

4. **Transport of Carbon Dioxide**: When it comes to carbon dioxide, hemoglobin can also bind with it. When carbon dioxide binds to hemoglobin, it forms carboxyhemoglobin.

5. **Percentage of Carbon Dioxide Transport**:
- About 20-25% of carbon dioxide is transported in the form of carboxyhemoglobin (bound to hemoglobin).
- Approximately 70% of carbon dioxide is transported as bicarbonate ions (HCO3-) in the plasma.
- The remaining 7% is dissolved directly in the plasma.

6. **Conclusion**: Since carbon dioxide can indeed be transported with hemoglobin (as carboxyhemoglobin), the original statement is false.

**Final Answer**: The statement "Carbon dioxide cannot be transported with hemoglobin" is false because carbon dioxide can bind to hemoglobin to form carboxyhemoglobin, and it is transported in the blood in several forms, including as bicarbonate ions.

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