In relatively large amounts, the soil supplies nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur; these are often called the macronutrients. 

Macronutrients in Dry Matter

Macronutrients are the essential elements that are required in large quantities by plants for their growth and development. These elements occur in 1-10 mg/g of dry matter and are important for the proper functioning of the plant's metabolic processes. The correct option is A, which states that macronutrients are the essential elements that occur in 1-10 mg/g of dry matter.

The primary macronutrients required by plants are:

1. Nitrogen (N): Nitrogen is essential for the formation of proteins, nucleic acids, and chlorophyll. It is also involved in the growth and development of the plant.

2. Phosphorus (P): Phosphorus is required for the formation of ATP, DNA, and RNA. It is also important for the growth and development of roots and shoots.

3. Potassium (K): Potassium is important for the regulation of water balance in the plant, and it is involved in the development of fruit and flowers.

Other macronutrients required by plants include:

4. Calcium (Ca): Calcium is important for the structure and function of cell walls, and it is involved in the regulation of nutrient uptake.

5. Magnesium (Mg): Magnesium is important for the formation of chlorophyll, and it is involved in the regulation of enzyme activity.

6. Sulfur (S): Sulfur is important for the formation of amino acids and proteins, and it is involved in the synthesis of chlorophyll.

In conclusion, macronutrients are essential elements that occur in 1-10 mg/g of dry matter and are required by plants for their growth and development. These elements include nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur.

When plant needs 10 mili mole/kg dry wt or more then assential then it's macronutrients and lower then,10 mili mole /kg then called micronutrient.