Write one function of sulphur, potassium and iron in plants

Explanation

**Step-by-Step Text Solution:**

1. **Function of Sulphur in Plants:**
- Sulphur is essential for the formation of chlorophyll, which is the green pigment responsible for photosynthesis. Additionally, it plays a role in nodule formation in legumes, which helps in nitrogen fixation.

2. **Function of Potassium in Plants:**
- Potassium is crucial for energy transfer within the plant. It is involved in the synthesis of ATP (adenosine triphosphate) and ADP (adenosine diphosphate), which are vital for energy storage and transfer. Furthermore, potassium aids in cell division and overall plant growth.

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