Type of symmetry with only one central axis but many planes of symmetry is

Options

A. bilateral symmetry
B. radial symmetry
C. asymmetry
D. spherical symmetry

Answer

To determine the type of symmetry characterized by having only one central axis but many planes of symmetry, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Symmetry**: Symmetry in biological organisms refers to the balanced proportions of their body structures. There are several types of symmetry, including bilateral, radial, and spherical symmetry.

2. **Identifying Central Axis**: The question specifies that there is only one central axis. This means that the organism can be divided into equal halves along this single line.

3. **Considering Planes of Symmetry**: The question also mentions many planes of symmetry. This indicates that there are multiple ways to divide the organism into equal halves, all of which pass through the central axis.

4. **Evaluating Types of Symmetry**:
- **Bilateral Symmetry**: This type has one plane of symmetry and divides the organism into two equal halves. However, it does not have multiple planes of symmetry.
- **Radial Symmetry**: This type has one central axis and can be divided into multiple equal parts by several vertical planes passing through this axis. This fits the description given in the question.
- **Spherical Symmetry**: This type allows for division into equal halves through many planes, but it does not have a single central axis.

5. **Conclusion**: Based on the definitions and characteristics of the different types of symmetry, the correct answer is **Radial Symmetry**. This type of symmetry has one central axis and can be divided into equal halves by many planes.

### Final Answer:
The type of symmetry with only one central axis but many planes of symmetry is **Radial Symmetry**.