Uptake of most of the minerals by roots in apoplast is

Options

A. active, apoplastic
B. symplastic, passive
C. active, ATP dependant
D. passive, involving specific proteins

Answer

To solve the question regarding the uptake of most minerals by roots in the apoplast, we can break down the process into clear steps:

### Step-by-Step Solution:

1. **Understanding Apoplastic Pathway**: The apoplast refers to the space outside the plasma membranes within a plant, which includes cell walls and intercellular spaces. It allows for the movement of water and solutes.

2. **Initial Uptake of Ions**: The first phase of mineral uptake occurs in the apoplast, where ions move through free space. This process is characterized as rapid and does not require energy (ATP).

3. **Nature of Movement**: The movement of ions in this phase is passive. This means that ions are moving down their concentration gradient without the need for energy input.

4. **Role of Ion Channels**: The passive movement of ions into the apoplast typically occurs through specific proteins known as ion channels. These channels facilitate the flow of ions into the apoplastic space.

5. **Second Phase of Uptake**: After the initial passive uptake in the apoplast, the ions then move into the symplast, which is the inner space of the cell. This phase is characterized by a slower uptake process.

6. **Active Transport in the Symplast**: The movement of ions into the symplast is active, meaning it requires energy (ATP) to occur. This is essential for the plant to accumulate necessary minerals against their concentration gradient.

7. **Conclusion**: Therefore, the correct answer to the question is that the uptake of most minerals by roots in the apoplast is **passive**.

### Final Answer:
The uptake of most of the minerals by roots in apoplast is **passive**.

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