Plant movements unrelated to external stimulus are

Options

A. Autonomic
B. Paratonic
C. Mechanical
D. Hygroscopic

Answer

To answer the question about plant movements that are unrelated to external stimuli, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Plant Movements**:
- Plant movements can be classified based on whether they are influenced by external stimuli or not.
- Movements that occur without any external influence are termed as "automatic movements".

2. **Identifying Automatic Movements**:
- Automatic movements are spontaneous movements that occur within the plant's protoplast.
- These movements are not triggered by external factors but rather occur internally.

3. **Evaluating the Options**:
- **Option 1: Automatic** - This is the correct answer as it refers to movements that are spontaneous and not influenced by external stimuli.
- **Option 2: Paratonic** - This type of movement is influenced by external stimuli, making it incorrect for our question.
- **Option 3: Mechanical** - Mechanical movements also occur due to external stimuli, hence this option is incorrect.
- **Option 4: Hygroscopic** - This movement is related to changes in moisture levels and is also influenced by external stimuli, making it incorrect.

4. **Conclusion**:
- After evaluating all the options, the only type of plant movement that is unrelated to external stimuli is the **automatic movement**.

### Final Answer:
The plant movements unrelated to external stimulus are **automatic movements**.

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