Statements
A-Carbonic anhydrase is present in the erythrocytes.B-In erythrocytes the carbondioxide combine with water and is transported.

Options

A. Statement A is correct and is responsible for statement B
B. Statement A is not correct but Statement B is correct
C. Both Statement A and B are wrong
D. Statement A is correct and statement B is wrong

Answer

To analyze the given statements regarding carbonic anhydrase and its role in erythrocytes, we can break down the information step by step.

### Step-by-Step Solution:

1. **Understanding Statement A**:
- The statement claims that "Carbonic anhydrase is present in the erythrocytes."
- **Analysis**: Carbonic anhydrase is indeed an enzyme found in red blood cells (erythrocytes). Its primary function is to catalyze the conversion of carbon dioxide and water into carbonic acid, which is crucial for maintaining acid-base balance in the blood.
- **Conclusion**: Statement A is correct.

2. **Understanding Statement B**:
- The statement claims that "In erythrocytes, the carbon dioxide combines with water and is transported."
- **Analysis**: When carbon dioxide enters the erythrocytes from the tissues, it reacts with water to form carbonic acid (H2CO3). This reaction is facilitated by carbonic anhydrase. The carbonic acid can then dissociate into bicarbonate ions (HCO3-) and hydrogen ions (H+), allowing for efficient transport of carbon dioxide in the blood.
- **Conclusion**: Statement B is also correct.

3. **Final Assessment**:
- Since both statements A and B are correct, we can conclude that the correct answer is that both statements are true.

### Final Answer:
Both statements A and B are correct.