Pteridophytes are considered as precursors or forerunners to the seed plants.

Explanation

### Step-by-Step Solution:

1. **Understanding Pteridophytes**:
Pteridophytes are a group of vascular plants that reproduce via spores instead of seeds. They include ferns, horsetails, and clubmosses.

2. **Development of Zygote**:
In pteridophytes, the zygote develops into an embryo within the female gametophyte. This is a significant advancement in their reproductive process.

...