An important essential element is necessary in plants for protein synthesis
Or
The most important element associated with protoplasm and proteinaceous materials of plant is

Options

A. Nitrogen
B. Oxygen
C. Sulphur
D. Potassium.

Answer

To answer the question regarding the important essential element necessary in plants for protein synthesis, we can follow these steps:

### Step 1: Understand the Role of Elements in Protein Synthesis
- Protein synthesis in plants involves the formation of proteins from amino acids.
- Amino acids are the building blocks of proteins, and they contain specific elements that are crucial for their structure.

**Hint:** Think about what elements are found in amino acids and how they contribute to protein structure.

### Step 2: Identify the Key Element for Amino Acids
- The primary element that is a constituent of amino acids is nitrogen.
- Each amino acid has an amino group (-NH2) that contains nitrogen, which is essential for the formation of proteins.

**Hint:** Recall the structure of amino acids and identify which part contains nitrogen.

### Step 3: Evaluate Other Elements Listed
- The other options are oxygen, sulfur, and potassium.
- **Oxygen** is present in amino acids but is not the key element for their synthesis.
- **Sulfur** is found in some amino acids (like cysteine and methionine) but is not essential for all.
- **Potassium** is important for various physiological functions in plants but does not play a direct role in protein synthesis.

**Hint:** Consider the specific functions of each element in relation to protein synthesis.

### Step 4: Conclude the Answer
- Since nitrogen is a necessary component of all amino acids and, consequently, proteins, it is the most important essential element associated with protoplasm and proteinaceous materials in plants.

**Final Answer:** The important essential element necessary in plants for protein synthesis is **nitrogen**.