The plane of cell wall formation in a dividing cell is determined by
" "
The filaments associated with cilia and flagella are constituted by

Options

A. Microfilaments
B. Microtubules
C. Golgi apparatus
D. Endoplasmic reticulum

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question consists of two parts. The first part asks about the determination of the plane of cell wall formation in a dividing cell, and the second part inquires about the filaments associated with cilia and flagella.

2. **Analyzing the First Part**: The plane of cell wall formation during cell division is crucial for proper cell division. In plant cells, this plane is known as the cell plate, which forms during cytokinesis.

3. **Identifying the Components**: The cell plate is formed by the fusion of vesicles that contain cell wall materials. The organization of these vesicles and the formation of the cell plate is guided by structures within the cell.

4. **Determining the Correct Structure**: The structure that determines the plane of cell wall formation is composed of microtubules. These microtubules are part of the cytoskeleton and play a significant role in cell division by helping to organize the cell plate.

5. **Analyzing the Second Part**: The second part of the question asks about the filaments associated with cilia and flagella. Cilia and flagella are cellular structures that facilitate movement.

6. **Identifying the Composition of Cilia and Flagella**: Cilia and flagella are primarily composed of microtubules arranged in a specific pattern (9+2 arrangement). These microtubules are made up of proteins called tubulins (alpha and beta tubulin).

7. **Conclusion**: Based on the analysis, both the plane of cell wall formation in a dividing cell and the filaments associated with cilia and flagella are determined by microtubules.

### Final Answer:
The plane of cell wall formation in a dividing cell is determined by **microtubules**. The filaments associated with cilia and flagella are also constituted by **microtubules**.

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