Which of the following is a mobile mineral element in the plants?

Options

A. Ca
B. Mo
C. Fe
D. Cu

Explanation

To determine which of the following is a mobile mineral element in plants, we need to analyze each option provided:

1. **Understanding Mobile and Immobile Mineral Elements**:
- Mobile mineral elements are those that can move within the plant from older tissues to younger tissues. They are essential for various physiological processes throughout the plant.
- Immobile mineral elements, on the other hand, remain in the tissues where they are initially deposited and cannot be easily relocated to other parts of the plant.

2. **Analyzing the Options**:
- **Option A: Calcium** - Calcium is generally considered an immobile element. It is primarily found in the cell walls and is not readily translocated to other parts of the plant.
- **Option B: Molybdenum** - Molybdenum is known to be a mobile mineral element. It is absorbed by plants in the form of molybdate ions and is required in various parts of the plant.
- **Option C: Ferrous (Iron)** - Iron is also classified as an immobile element. It is crucial for chlorophyll synthesis but does not move easily within the plant.
- **Option D: Copper** - Copper is another immobile mineral element. It plays a role in various enzymatic processes but is not translocated within the plant.

3. **Conclusion**:
- Based on the analysis, the only mobile mineral element among the options provided is **Molybdenum** (Option B).

Thus, the answer to the question is **Option B: Molybdenum**.

---