Passive obsorption of minerals salts is not dependent on

Options

A. osmosis
B. diffusion
C. Donnan equilibrium
D. ion exchange

Answer

To solve the question "Passive absorption of mineral salts is not dependent on," we will analyze each option provided.

### Step 1: Understand Passive Absorption
Passive absorption refers to the process by which minerals are absorbed by plants without the expenditure of energy. This process relies on physical and chemical gradients.

### Step 2: Analyze the Options
1. **Osmosis**: This is the movement of water across a semipermeable membrane from a region of lower solute concentration to a region of higher solute concentration. While osmosis is crucial for water uptake, it is not the primary mechanism for the passive absorption of mineral salts.

2. **Diffusion**: This is the movement of particles from an area of higher concentration to an area of lower concentration. Mineral salts can be absorbed through diffusion, making this option dependent on passive absorption.

3. **Donnan Equilibrium**: This refers to the distribution of ions across a semipermeable membrane that can affect the absorption of certain ions. It plays a role in passive absorption, making this option also dependent.

4. **Ion Exchange**: This is a process where one ion is replaced by another. It is a mechanism that can facilitate the uptake of minerals, indicating that it is also dependent on passive absorption.

### Step 3: Conclusion
After analyzing all the options, we can conclude that passive absorption of mineral salts is **not dependent on osmosis**.

### Final Answer
The correct answer is **osmosis**.

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