Movement in peristomial teeth of mosses is

Options

A. hydrochasy
B. xerochasy
C. chemotactic
D. chemotropism

Answer

**Step-by-Step Solution:**

1. **Understanding Peristomial Teeth**: Peristomial teeth are structures found in the moss capsule that play a crucial role in the dispersal of spores. They act as valves that open and close depending on the humidity levels.

2. **Function of Peristomial Teeth**: These teeth allow spores to be released from the capsule when the humidity is low. When the environment is dry, the peristomial teeth open up, enabling the spores to spill out and disperse into the surrounding area.

3. **Analyzing the Options**:
- **Option 1: Hydrochase**: This term refers to a plant's response to water. Since peristomial teeth do not directly respond to water in this manner, this option is incorrect.
- **Option 2: 0-6-Z**: This option is relevant because it describes the mechanism of spore release when the capsule dries out. The peristomial teeth expand when dry, allowing spores to be released. Therefore, this is the correct answer.
- **Option 3: Chemotactic**: This term refers to a movement response to chemicals. Since peristomial teeth do not respond to chemical stimuli, this option is incorrect.
- **Option 4: Chemotropism**: This term describes plant growth towards a chemical stimulus. Since this does not apply to the movement of peristomial teeth, this option is also incorrect.

4. **Conclusion**: Based on the analysis of the options, the correct answer is **Option 2: 0-6-Z**, as it accurately describes the movement of peristomial teeth in response to dryness.