Which group of three micronutrient elements is required for both photosynthesis and mitochondrial electron transport ?

Options

A. Cu, Mn, Fe
B. Co, Ni, Mo
C. Ca, K, Na
D. Mn, Co, Ca

Answer

To solve the question regarding which group of three micronutrient elements is required for both photosynthesis and mitochondrial electron transport, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Micronutrients**: We need to find three micronutrients that play a role in both photosynthesis and mitochondrial electron transport.

2. **Analyze Each Option**: Let's consider the micronutrients one by one:
- **Copper (Cu)**: Copper is absorbed in the form of cupric ions (Cu²⁺) and is essential for redox reactions, which are crucial in the mitochondrial electron transport chain.
- **Manganese (Mn)**: Manganese is absorbed as Mn²⁺ and is vital for the splitting of water during photosynthesis, which releases oxygen. This oxygen is then utilized in the mitochondrial electron transport system.
- **Iron (Fe)**: Iron is necessary for the formation of chlorophyll, which is essential for photosynthesis. Additionally, iron is a critical component of various enzymes involved in the mitochondrial electron transport chain.

3. **Conclude the Group**: After analyzing the roles of copper, manganese, and iron, we can conclude that all three are required for both photosynthesis and mitochondrial electron transport.

4. **Final Answer**: The group of three micronutrient elements required for both photosynthesis and mitochondrial electron transport is **Copper, Manganese, and Iron**.