Select the incorrect statement :

Options

A. Majority of nutrients required for plant growth and development become available to root, due to weathering and breakdown to rocks
B. Soil supplies air to the roots
C. Decomposition is a process to recycle minerals in soil
D. Only macro nutrients form the components of fertilisers

Answer

To solve the question, "Select the incorrect statement," we will evaluate each of the provided statements regarding plant growth and nutrients.

### Step-by-Step Solution:

1. **Evaluate the First Statement:**
- The statement claims that "the majority of nutrients required for plant growth development become available to the root due to weathering and breakdown of rocks, while rocks act as a reservoir of minerals."
- This statement is true. Weathering of rocks releases minerals into the soil, making them available for plant uptake.

2. **Evaluate the Second Statement:**
- The statement says, "Soil supplies air to the root."
- This statement is also true. Soil's porous nature allows air to circulate, providing oxygen to plant roots, which is essential for respiration.

3. **Evaluate the Third Statement:**
- The statement mentions, "Decomposition is the process to recycle the minerals in the soil."
- This statement is correct. Decomposition by organisms like bacteria and fungi recycles nutrients, returning them to the soil.

4. **Evaluate the Fourth Statement:**
- The statement claims, "Only macronutrients form the components of the fertilizers."
- This statement is incorrect. Fertilizers contain both macronutrients (like nitrogen, phosphorus, and potassium) and micronutrients (like iron, manganese, etc.). Thus, it is misleading to say that only macronutrients are components of fertilizers.

### Conclusion:
The incorrect statement is the fourth one, which implies that only macronutrients are components of fertilizers.

### Final Answer:
**The incorrect statement is: "Only macronutrients form the components of the fertilizers."**

---