Which of the following are considered as functioning of iron (Fe) in plants?
I. Important constituent of cytochrome
II. Activator of catalase
III. Essential for chlorophyll synthesis:
Choose the correct option.

Options

A. Only I
B. Only III
C. Only II
D. All of these

Answer

To determine the functions of iron (Fe) in plants, we will analyze each statement provided in the question:

1. **Important constituent of cytochrome**:
- Iron is indeed a crucial component of cytochromes, which are proteins involved in electron transport and energy production during cellular respiration. Therefore, this statement is correct.

2. **Activator of catalase**:
- Iron acts as a cofactor for various enzymes, including catalase, which is responsible for breaking down hydrogen peroxide into water and oxygen. This means that iron is necessary for the proper functioning of catalase. Hence, this statement is also correct.

3. **Essential for chlorophyll synthesis**:
- Iron plays a vital role in the synthesis of chlorophyll, the pigment responsible for photosynthesis in plants. Without sufficient iron, chlorophyll production is hindered, leading to chlorosis (yellowing of leaves). Thus, this statement is correct as well.

Now, let's summarize the findings:
- All three statements regarding the functions of iron in plants are correct.

**Conclusion**: The correct option is that all of the statements (I, II, and III) are functions of iron in plants.