Elements useful in photosynthesis

Options

A. Cu, Co, Fe
B. Cu, Mo, Zn
C. Cl, Mg, Mn
D. Mg, Fe, Co, Mn

Answer

To answer the question regarding the elements useful in photosynthesis, we will analyze the options provided and identify the correct elements that play a role in the photosynthesis process.

### Step-by-Step Solution:

1. **Identify the Elements in Each Option:**
- Option 1: Copper, Cobalt, and Iron (Ferrous)
- Option 2: Copper, Molybdenum, and Zinc
- Option 3: Chlorine, Magnesium, and Manganese
- Option 4: Magnesium, Iron (Ferrous), Cobalt, and Manganese

2. **Understand the Role of Each Element:**
- **Magnesium (Mg):** It is crucial for photosynthesis as it is the central atom in chlorophyll, which is essential for capturing light energy.
- **Iron (Fe):** It is necessary for the synthesis of chlorophyll and is involved in various electron transport proteins that facilitate the photosynthetic process.
- **Cobalt (Co):** It is required for the functioning of several enzymes and coenzymes that assist in metabolic processes, including those involved in photosynthesis.
- **Manganese (Mn):** It plays a vital role in the photolysis of water, which is the process of breaking down water molecules into hydrogen and oxygen during photosynthesis.

3. **Evaluate the Options Based on Their Functions:**
- Option 1 does not include magnesium, which is essential for chlorophyll.
- Option 2 lacks magnesium and iron, both of which are critical for photosynthesis.
- Option 3 includes magnesium and manganese but does not mention iron or cobalt.
- Option 4 includes magnesium, iron, cobalt, and manganese, all of which are important for photosynthesis.

4. **Select the Correct Option:**
- The correct option is **Option 4: Magnesium, Iron, Cobalt, and Manganese** as all these elements are essential for the process of photosynthesis.

### Final Answer:
The elements useful in photosynthesis are **Magnesium, Iron (Ferrous), Cobalt, and Manganese** (Option 4).