A : `alpha` amylase of wheat endosperm has 16 isoenzymes.
R : In competitive inhibition `V_(max)` decreases.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
C. If Assertion is true statements but Reason is false, then mark (3).
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To solve the question, we need to analyze both the assertion (A) and the reason (R) provided.

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that "alpha amylase of wheat endosperm has 16 isoenzymes."
- **Explanation**: Alpha amylase is an enzyme that plays a crucial role in the germination of seeds by breaking down starch into sugars. Isoenzymes (or isoforms) are different forms of an enzyme that catalyze the same reaction but may differ in amino acid sequence or regulatory properties. The statement claims that there are 16 isoenzymes of alpha amylase in wheat endosperm.
- **Conclusion**: This statement is **true**.

2. **Understanding the Reason (R)**:
- The reason states that "In competitive inhibition, Vmax decreases."
- **Explanation**: Competitive inhibition occurs when an inhibitor competes with the substrate for binding to the active site of the enzyme. In this type of inhibition, the maximum velocity (Vmax) of the reaction does not change because if enough substrate is present, it can outcompete the inhibitor. However, the Michaelis constant (Km) increases, indicating a higher substrate concentration is required to reach half of Vmax.
- **Conclusion**: This statement is **false**.

3. **Final Evaluation**:
- Since the assertion (A) is true and the reason (R) is false, the correct conclusion is that the assertion is true but the reason is false.

### Final Answer:
The correct option is that the assertion is true, but the reason is false.

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