Assertion : Series of reactions in TCA cycle takes place in mitochondria.
Reason : Mitochondrial envelope contains all the respiratory enzymes required for respiratory reactions.

Options

A. If both Assertion and Reason are true and Reason is correct explanation of Assertion.
B. If both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
C. If Assertion is true but Reason is false.
D. If both Assertion and Reason are false.

Answer

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

### Step 1: Understanding the Assertion
- **Assertion**: "Series of reactions in TCA cycle takes place in mitochondria."
- The TCA cycle, also known as the Krebs cycle or Citric Acid Cycle, is indeed located in the mitochondria. Specifically, the reactions occur in the mitochondrial matrix.

### Step 2: Understanding the Reason
- **Reason**: "Mitochondrial envelope contains all the respiratory enzymes required for respiratory reactions."
- The mitochondrial envelope consists of an outer membrane and an inner membrane. While many enzymes involved in the TCA cycle are located in the mitochondrial matrix, one enzyme, Succinate Dehydrogenase, is bound to the inner mitochondrial membrane. Therefore, the statement that all respiratory enzymes are contained within the mitochondrial envelope is incorrect.

### Step 3: Conclusion
- The assertion is true because the TCA cycle does take place in the mitochondria.
- The reason is false because not all respiratory enzymes are located in the mitochondrial envelope; some are located in the matrix, and one is bound to the inner membrane.

### Final Answer
- The correct conclusion is that the assertion is true, but the reason is false.