Which of the following is an example of movement?

Options

A. Streaming of Protoplasm
B. Winking of eyelids
C. Flexing of arms
D. All of the above

Answer

To determine which of the following is an example of movement, we need to analyze each option carefully. Movement can occur in various forms, and it is essential to differentiate between movement and locomotion.

### Step-by-Step Solution:

1. **Understanding Movement vs. Locomotion**:
- Movement refers to any change in position or posture of an organism or its parts, while locomotion specifically refers to the ability to change location or move from one place to another.

2. **Identifying the Options**:
- We need to look at the options provided in the question and evaluate each one for its relevance to the concept of movement.

3. **Analyzing Protoplasmic Streaming**:
- Protoplasmic streaming (or cytoplasmic streaming) is the movement of the cytoplasm within a cell. This process does not involve muscle tissue but is essential for transporting substances within the cell. Therefore, this is a form of movement.

4. **Evaluating Winking of Eyelids**:
- Winking involves the voluntary contraction of muscles around the eyelids. This action is a clear example of movement since it changes the position of the eyelids.

5. **Considering Flexing of Arm**:
- Flexing the arm involves the contraction of muscles to change the angle at the elbow joint. Although the body remains in the same position, the arm's position changes, making this another example of movement.

6. **Conclusion**:
- All three actions (streaming of protoplasm, winking of eyelids, and flexing of the arm) are examples of movement. Therefore, the correct answer is **option D: all of the above**.