Sleep movement Papaya/Balsam is

Options

A. Autonomic movement
B. Tropic movement
C. Movement of locomotion
D. Growth movement.

Answer

**Step-by-Step Solution:**

1. **Understanding Sleep Movements**: Sleep movements in plants refer to the movements of leaves and leaflets that occur in response to the onset of darkness. This is a type of movement that is rhythmic and follows a daily cycle.

2. **Identifying the Type of Movement**: The movements associated with sleep are known as "nastic movements." Specifically, they are called "nyctinastic movements," which are movements that occur in response to the changes in light and darkness.

3. **Differential Growth**: The sleep movement is caused by differential growth between the upper and lower sides of the petioles (the stalk that attaches the leaf blade to the stem). This means that one side of the petiole grows more than the other, causing the leaf to move.

4. **Examples of Plants**: The question specifically mentions papaya and balsam. Both of these plants exhibit sleep movements, where their leaves fold or droop during the night.

5. **Conclusion**: Based on the understanding of sleep movements and the examples provided, the correct classification of the sleep movement in papaya and balsam is that it is a type of growth movement.

**Final Answer**: The sleep movement in papaya and balsam is classified as a growth movement.

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