How is sulphur important for plants ? Name the amino acids in which it is present.

Explanation

### Step-by-Step Solution

1. **Importance of Sulfur for Plants**:
- Sulfur is an essential macronutrient for plants. It plays a crucial role in various physiological and biochemical processes.
- It is absorbed by plants primarily in the form of sulfate ions (SO₄²⁻).

2. **Functions of Sulfur**:
- **Component of Amino Acids**: Sulfur is a vital component of certain amino acids, which are the building blocks of proteins.
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