Copper is present in

Options

A. plasmalemma
B. plastoquinone
C. plastocyanin
D. ferredoxin

Answer

### Step-by-Step Solution:

1. **Understanding Copper in Plants**:
- Copper is an essential micronutrient for plants, meaning it is required in small amounts for their growth and metabolism.

2. **Categories of Nutrients**:
- Nutrients in plants are divided into two categories: macronutrients (needed in large amounts) and micronutrients (needed in small amounts). Copper falls under the category of micronutrients.

3. **Forms of Copper**:
- Plants absorb copper primarily in the form of cupric ions (Cu²⁺).

4. **Role of Copper**:
- Copper is vital for various metabolic processes in plants and is associated with certain enzymes that facilitate these processes.

5. **Identifying Copper-containing Proteins**:
- Among the options provided (Plasma Lemma, Plastoquinone, Plastocyanin, and Ferredoxin), we need to identify which one contains copper.

6. **Analyzing the Options**:
- **Plasma Lemma**: This is a term that refers to the plasma membrane of plant cells and does not specifically indicate the presence of copper.
- **Plastoquinone**: This is a molecule involved in the photosynthetic electron transport chain but does not contain copper.
- **Plastocyanin**: This is a copper-containing protein that plays a crucial role in electron transfer during photosynthesis.
- **Ferredoxin**: This is an iron-sulfur protein involved in electron transfer but does not contain copper.

7. **Conclusion**:
- Based on the analysis, the correct answer is **Plastocyanin**, as it is the only option that contains copper.