Which of the element is required in larger amounts in comparison to other micronutrients. It is an important constituent of proteins like ferredoxin and cytochromes

Options

A. Boron
B. Molybdenum
C. Copper
D. Iron

Explanation

To solve the question regarding which element is required in larger amounts compared to other micronutrients and is an important constituent of proteins like ferredoxin and cytochromes, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Categories of Nutrients**:
- Nutrients are classified into two main categories: macronutrients (required in larger amounts) and micronutrients (required in smaller amounts).

2. **List the Given Elements**:
- The elements mentioned in the question are boron, molybdenum, copper, and iron.

3. **Understand Micronutrient Requirements**:
- Among the micronutrients, some are required in larger amounts than others.

4. **Focus on the Key Elements**:
- The question specifies that the element in question is an important constituent of proteins like ferredoxin and cytochromes.

5. **Analyze Each Element**:
- **Boron**: Primarily involved in cell wall formation and reproductive development.
- **Molybdenum**: Involved in nitrogen fixation and enzyme function.
- **Copper**: Plays a role in photosynthesis and respiration but is generally required in smaller amounts.
- **Iron**: Essential for the formation of hemoproteins like cytochromes and ferredoxin, and is crucial for electron transfer processes.

6. **Determine the Correct Answer**:
- Iron is the element that is required in larger amounts compared to other micronutrients and is a vital component of proteins involved in electron transport.

### Final Answer:
The element required in larger amounts in comparison to other micronutrients and is an important constituent of proteins like ferredoxin and cytochromes is **Iron**.

---