Essential elements as components of energy related chemical compound in plants, is/are :-

Options

A. Only Iron
B. Only Magnesium
C. Only Molybdenum
D. Phosphorus and magnesium

Answer

To solve the question regarding the essential elements as components of energy-related chemical compounds in plants, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Energy-Related Chemical Compounds in Plants**:
- The primary energy-related chemical compounds in plants are ATP (adenosine triphosphate) and chlorophyll.

2. **Analyze the Composition of Chlorophyll**:
- Chlorophyll is crucial for photosynthesis and gives plants their green color. It contains magnesium as a central atom in its structure.

3. **Analyze the Composition of ATP**:
- ATP is the energy currency of the cell and is produced during photosynthesis. The structure of ATP includes phosphate groups, which are derived from phosphorus.

4. **List the Essential Elements**:
- From the analysis, we can conclude that magnesium (found in chlorophyll) and phosphorus (found in ATP) are essential elements that are components of energy-related chemical compounds in plants.

5. **Select the Correct Answer**:
- Based on the above analysis, the correct answer to the question is that the essential elements are magnesium and phosphorus.

### Final Answer:
The essential elements as components of energy-related chemical compounds in plants are magnesium and phosphorus.