Hair like outgrowth of cell membrane useful for movement are

Options

A. Cilia and flagella
B. Cilia and cytoskeleton
C. Spindle fibres
D. Ribosomes

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for the hair-like outgrowths of the cell membrane that are useful for movement.

2. **Understand the Options**: The options provided are:
- Cilia and flagella
- Cilia and cytoskeleton
- Spindle fibers
- Ribosomes

3. **Analyze Each Option**:
- **Cilia and Flagella**: Both are hair-like structures that extend from the surface of cells. They are involved in movement. Cilia are typically shorter and more numerous, while flagella are longer and usually fewer in number.
- **Cilia and Cytoskeleton**: While cilia are involved in movement, the cytoskeleton is a network of protein filaments that provides structural support and aids in cell shape and motility but is not a hair-like outgrowth.
- **Spindle Fibers**: These are involved in cell division (mitosis) and are not hair-like outgrowths.
- **Ribosomes**: These are involved in protein synthesis and are not related to movement.

4. **Determine the Correct Answer**: Since cilia and flagella are both hair-like structures that facilitate movement, the correct answer is **Cilia and Flagella**.

5. **Final Answer**: The hair-like outgrowths of the cell membrane useful for movement are **Cilia and Flagella**.

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