The centre of a cyclone storm called the 'eye of cyclone' is an area of :

Options

A. very low air pressure
B. moderate air pressure
C. very high air pressure
D. gradually rising air pressure

Answer

To determine the characteristics of the center of a cyclone, known as the 'eye of the cyclone', we can analyze the options provided:

1. **Understanding the Eye of the Cyclone**: The eye of a cyclone is the calm center of the storm. It is surrounded by the storm's most intense winds and rain.

2. **Analyzing Air Pressure**:
- Cyclones are formed due to differences in air pressure.
- Winds move from areas of high pressure to areas of low pressure.

3. **Evaluating the Options**:
- **Option 1: Very Low Air Pressure**: This is the correct answer. The eye of the cyclone is characterized by very low air pressure.
- **Option 2: Moderate Air Pressure**: This is incorrect as the eye does not have moderate pressure.
- **Option 3: Very High Air Pressure**: This is also incorrect because the eye is not a high-pressure area.
- **Option 4: Gradually Rising Air Pressure**: This is incorrect as well; the pressure in the eye is not gradually rising.

4. **Conclusion**: The eye of the cyclone is an area of very low air pressure. This low pressure causes surrounding air to rush towards the center, creating the circular motion characteristic of cyclones.

### Final Answer:
The center of a cyclone storm called the 'eye of cyclone' is an area of **very low air pressure**.