Actinomorphic flower:
A mustard flower is an example of an actinomorphic flower. Actinomorphic flowers are those that possess radial symmetry, meaning their floral parts are arranged in a circular or star-like pattern. This symmetry allows the flower to be divided into two or more equal halves by any vertical plane passing through the center.

Characteristics of Actinomorphic Flowers:
1. Radial Symmetry: Actinomorphic flowers exhibit radial symmetry, meaning their floral parts are arranged in a circular or star-like pattern.

2. Regular Floral Organs: The floral organs, such as sepals, petals, stamens, and carpels, are identical in size, shape, and arrangement.

3. Multiple Planes of Symmetry: Actinomorphic flowers can be divided into multiple equal halves by any vertical plane passing through the center.

4. Pollination: These flowers are often pollinated by wind or insects, as their symmetrical structure allows for easy access to pollen and nectar from any direction.

5. Examples: Apart from mustard flowers, other examples of actinomorphic flowers include roses, daisies, sunflowers, and lilies.

Advantages of Actinomorphic Flowers:
1. Efficient Pollination: Actinomorphic flowers, with their radial symmetry, can be easily accessed by pollinators from any direction, increasing the chances of successful pollination.

2. Attractiveness: The symmetrical arrangement of floral parts in actinomorphic flowers often makes them visually appealing to pollinators and humans alike.

3. Adaptability: The radial symmetry of actinomorphic flowers allows them to adapt to various environmental conditions, as they can receive pollen from different directions.

Conclusion:
In summary, a mustard flower is an example of an actinomorphic flower. Actinomorphic flowers possess radial symmetry, regular floral organs, and can be divided into multiple equal halves by any vertical plane passing through the center. They are efficient in pollination, visually appealing, and adaptable to different environmental conditions.