The movement of Ions against the concentration gradient will be -

Options

A. Active transport
B. Osmosis
C. Diffusion
D. All

Answer

To solve the question regarding the movement of ions against the concentration gradient, we will follow these steps:

### Step-by-Step Solution:

1. **Understanding the Concept**:
- The concentration gradient refers to the difference in the concentration of ions across a membrane. Movement against the concentration gradient means moving from an area of lower concentration to an area of higher concentration.

2. **Identifying the Types of Transport**:
- There are two main types of transport mechanisms: passive transport and active transport.
- Passive transport includes processes like diffusion and osmosis, which do not require energy and occur along the concentration gradient (from high to low concentration).
- Active transport, on the other hand, requires energy (usually from ATP) to move substances against their concentration gradient (from low to high concentration).

3. **Evaluating the Options**:
- **Option A: Active Transport**: This is the correct answer because it involves the movement of ions against the concentration gradient, requiring energy.
- **Option B: Osmosis**: This is incorrect. Osmosis is the movement of water across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration, which is along the gradient.
- **Option C: Diffusion**: This is also incorrect. Diffusion is the movement of molecules from an area of high concentration to an area of low concentration, which is along the gradient.
- **Option D**: This option is not specified in the transcript but is likely another incorrect option.

4. **Conclusion**:
- Based on the analysis, the movement of ions against the concentration gradient is best described by **active transport**.

### Final Answer:
The movement of ions against the concentration gradient will be **active transport**.

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