Assertion : Glomus show symbiotic association with higher plants
Reason : Azospirillum and Azotobacter are free living nitrogen fixing bacteria

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion:**
- The assertion states: "Glomus shows symbiotic association with higher plants."
- Glomus is a genus of arbuscular mycorrhizal fungi. These fungi form symbiotic relationships with the roots of higher plants, aiding in nutrient absorption, especially phosphorus. This statement is **true**.

2. **Understanding the Reason:**
- The reason states: "Azospirillum and Azotobacter are free-living nitrogen-fixing bacteria."
- Azospirillum and Azotobacter are indeed free-living bacteria that can fix atmospheric nitrogen into a form usable by plants. This statement is also **true**.

3. **Analyzing the Relationship:**
- The assertion talks about the symbiotic relationship between Glomus fungi and higher plants, while the reason discusses free-living nitrogen-fixing bacteria.
- Although both statements are true, the reason does not explain the assertion. The relationship between Glomus and higher plants is about mycorrhizal association, while Azospirillum and Azotobacter are not directly related to this type of symbiosis.

4. **Conclusion:**
- Since both the assertion and the reason are true, but the reason does not serve as an explanation for the assertion, the correct answer is: **Option 2** - Both assertion and reason are true, but the reason is not the correct explanation of the assertion.