Movement due to external stimuli is known as

Options

A. Autonomic movement
B. Paratonic movement
C. Amoeboid movement
D. Excretory movement

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term that describes movement in plants as a response to external stimuli.

2. **Analyzing the Options**:
- **Option 1: Autonomic Movement**: This refers to spontaneous movements in aquatic plants and is not triggered by external stimuli. Therefore, this option is incorrect.
- **Option 2: Paratonic Movement**: This term describes the movement of a plant or its parts in response to external stimuli. This option fits the definition given in the question, making it a strong candidate for the correct answer.
- **Option 3: Amoeboid Movement**: This is a type of movement seen in single-celled organisms like amoeba, characterized by the crawling movement due to the protrusion of cytoplasm. It does not relate to plant movements or external stimuli, so this option is also incorrect.
- **Option 4: Excretory Movement**: This movement occurs due to the excretion of substances by the plant and is not a response to external stimuli, thus making this option incorrect as well.

3. **Conclusion**: After analyzing all the options, the correct answer to the question "Movement due to external stimuli is known as" is **Paratonic Movement**.

**Final Answer**: Movement due to external stimuli is known as **Paratonic Movement**.

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