90 percent of the volume of the mature plant cell is occupied by

Options

A. Cytoplasm
B. Nucleus
C. Vacuole
D. Cell membrane

Answer

To answer the question "90 percent of the volume of the mature plant cell is occupied by," we can follow these steps:

### Step-by-step Solution:

1. **Understand the Structure of a Plant Cell**:
- A mature plant cell consists of various components, including the cell wall, cell membrane, cytoplasm, nucleus, and vacuole.

2. **Identify the Components**:
- The main components of a plant cell are:
- **Cell Wall**: Provides structure and support.
- **Cell Membrane**: Controls the movement of substances in and out of the cell.
- **Cytoplasm**: The jelly-like substance where cellular processes occur.
- **Nucleus**: Contains the genetic material and controls cell activities.
- **Vacuole**: A large, membrane-bound space that stores substances and helps maintain turgor pressure.

3. **Focus on the Vacuole**:
- In mature plant cells, the vacuole is usually very large and can occupy a significant portion of the cell's volume. It is involved in storage, waste disposal, and maintaining turgor pressure, which is crucial for the plant's structural integrity.

4. **Compare the Volume Occupied by Each Component**:
- The vacuole occupies about 90% of the volume in a mature plant cell, while the cytoplasm, nucleus, and cell membrane occupy much less space comparatively.

5. **Conclude the Answer**:
- Based on the information, the correct answer to the question is that 90 percent of the volume of the mature plant cell is occupied by the **vacuole**.

### Final Answer:
90 percent of the volume of the mature plant cell is occupied by the **vacuole**.