Point out the one which does not justify active absorption of minerals ?

Options

A. Cations and anions are often absoebed at different rates
B. Absorption of different ions is highly selective
C. absorption is accompanied by increase in the rate of respiration
D. Absorption is the movement of substances from higher concentration to their lower concentration

Answer

To solve the question "Point out the one which does not justify active absorption of minerals," we need to analyze each option provided in the context of active absorption.

### Step-by-Step Solution:

1. **Understand Active Absorption**: Active absorption of minerals refers to the process by which plants uptake minerals from the soil against the concentration gradient, which requires energy (ATP).

2. **Evaluate Each Option**:
- **Option A**: "Cations and anions are often absorbed at different rates."
- This statement is true. Different ions are absorbed at different rates, which is consistent with the selective nature of active absorption.
- **Option B**: "Absorption of different ions is highly selective."
- This is also true. Active absorption is a selective process, allowing plants to take up specific ions as needed.
- **Option C**: "Absorption is accompanied by an increase in the rate of respiration."
- This statement is true as well. Active transport requires energy, which is provided through respiration, leading to an increase in the rate of respiration.
- **Option D**: "Absorption is the movement of substances from higher concentration to their lower concentration."
- This statement is false in the context of active absorption. Active absorption involves moving substances from a region of lower concentration to a region of higher concentration, which is against the concentration gradient and requires energy.

3. **Conclusion**: The option that does not justify active absorption of minerals is **Option D**.

### Final Answer:
The correct answer is **Option D**: "Absorption is the movement of substances from higher concentration to their lower concentration."