All are true for mycorrhizal association except.

Options

A. Pinus seeds cannot germinate properly without such association
B. It's a symbiotic association of fungus and roots of higher plants
C. Surface area for water absorption increases
D. Associated fungus get minerals from plants

Answer

To solve the question regarding mycorrhizal associations, we will analyze each statement provided in the options and determine which one is not true.

### Step-by-Step Solution:

1. **Understanding Mycorrhizal Association**:
- Mycorrhizal association is a symbiotic relationship between fungi and the roots of higher plants. In this relationship, both partners benefit: the plant receives enhanced water and nutrient absorption, while the fungus gets carbohydrates and other organic compounds from the plant.

2. **Analyzing the Options**:
- **Option A**: "Pinus seeds can't germinate properly without such association."
- This statement is true. Pinus seeds require mycorrhizal fungi for proper germination and growth, making it an obligatory association.

- **Option B**: "It's a symbiotic association of fungus and roots of higher plants."
- This statement is also true. Mycorrhizal associations are indeed symbiotic, involving fungi and the roots of higher plants.

- **Option C**: "Surface area for water absorption increases."
- This statement is true as well. The presence of mycorrhizal fungi increases the surface area of the root system, thereby enhancing water and nutrient absorption.

- **Option D**: "Associated fungus get minerals from the plant."
- This statement is false. In a mycorrhizal association, the fungus does not obtain minerals from the plant; instead, it helps the plant absorb minerals from the soil. The fungus receives carbohydrates from the plant.

3. **Identifying the Exception**:
- Since Option D is the only statement that is not true regarding mycorrhizal associations, it is the correct answer to the question.

### Final Answer:
The statement that is not true for mycorrhizal association is: **"Associated fungus get minerals from the plant."**

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