Assertion : Mitochondria are absent in RBC.
Reason : RBC form ATP by glycolysis.

Options

A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A and R are false

Answer

To analyze the given assertion and reason, we will break down the statements step by step.

### Step 1: Analyze the Assertion
- **Assertion**: Mitochondria are absent in RBC (Red Blood Cells).
- **Explanation**: This statement is true. Red blood cells do not contain mitochondria. During their maturation process, RBCs expel their nucleus and organelles, including mitochondria, to maximize space for hemoglobin, which is essential for oxygen transport.

### Step 2: Analyze the Reason
- **Reason**: RBCs form ATP by glycolysis.
- **Explanation**: This statement is also true. Since RBCs lack mitochondria, they cannot perform aerobic respiration, which occurs in mitochondria. Instead, they rely on glycolysis, a process that occurs in the cytoplasm, to produce ATP anaerobically.

### Step 3: Determine the Relationship Between Assertion and Reason
- The assertion is true, and the reason is true as well. However, the reason does not explain the assertion. The absence of mitochondria in RBCs is not because they produce ATP through glycolysis; rather, it is a characteristic of their structure and function. The reason describes how RBCs generate ATP, but it does not clarify why they lack mitochondria.

### Conclusion
Both the assertion and the reason are true, but the reason is not the correct explanation of the assertion. Therefore, the correct answer is: **Both assertion and reason are true, but reason is not the correct explanation of the assertion.**

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