Define zygomorphic.

Hint: Zygomorphic, which mainly deals with the symmetry of the flower, floral symmetry is usually divided into Actinomorphic, Zygomorphic, and asymmetric, where the Zygomorphic means, the flower having bilateral symmetry.

Complete answer:
The main significance of floral symmetry is pollination, where it plays a major role.
- The scientist Sprengel casually divided the flowers into regular and irregular flowers
- In the case of regular flowers, the sexual organs like stamen and all are radiated in a uniform manner from the central axis, while in irregular flowers the scenario is not the same.
- One can understand floral symmetry by assessing the structural units of flowers in relation to the principal axis.
- So Zygomorphic means the flowers having the bilateral symmetry
- In this case, the petals are generally divided only in one way to form the mirror images.
- This Zygomorphic symmetry is common in flowers, having different sizes of petals, a classic example of Zygomorphic symmetry in flowers is orchids.
- The family Fabaceae or Leguminosae were regularly called as pea or bean family, these plants are economically very important, and the flowers of this family are Zygomorphic flowers.
- Zygomorphic flowers are mainly designed in such a way for the pollination.
- It is believed that most of the flowers are generally Actinomorphic, where later they evolved into Zygomorphic flowers.
- It is believed that most in the face surface of the Zygomorphic flowers are oriented either vertically or in an oblique manner.
- So most of the Zygomorphic flowers, the plane of symmetry is vertical, anyhow in some flowers it is transverse, which means the developmental plane of symmetry is usually horizontal to the median axis.

Note: When come to the frequency of floral symmetry, the most common type is Actinomorphic and medial Zygomorphic are more common types, whereas asymmetric flowers are uncommon, and one can add the differences between this symmetry also.