In plants, the `ul(A)` facilitates the transport of a number of ions and other materials against concentration gradient into the `ul(B)`.

Options

A. `"A - Tonoplast B- Vacuole"`
B. `"A - Outer membrane B - Mitochondria"`
C. `"A - Outer membrane B - Chloroplast"`
D. `"A - Tonoplast B - Mitochondria"`

Answer

To solve the question, we need to identify the components involved in the transport of ions and materials in plants. Here's a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understanding the Question**: The question states that in plants, a certain structure (A) facilitates the transport of ions and materials against a concentration gradient into another structure (B).

2. **Identifying Structure B**: In plant cells, the primary structure that stores ions and other materials is the vacuole. The vacuole is a large organelle that occupies a significant portion of the plant cell and is responsible for storing nutrients, waste products, and maintaining turgor pressure.

3. **Identifying Structure A**: The membrane surrounding the vacuole is known as the tonoplast. The tonoplast plays a crucial role in regulating the movement of ions and other substances into and out of the vacuole, often against their concentration gradients.

4. **Understanding the Function**: The tonoplast uses active transport mechanisms, such as proton pumps, to move ions into the vacuole. This process is essential for maintaining the turgor pressure of the cell, which helps keep the plant rigid and structurally sound.

5. **Final Answer**: Based on the above analysis, we conclude that:
- A is **tonoplast** (the membrane facilitating transport).
- B is **vacuole** (the storage organelle).

### Final Answer:
A: tonoplast
B: vacuole

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