Pteridophyta is a division of plants that includes ferns, horsetails, and whisk ferns. It is characterized by having a dominant sporophyte phase, a diploid main plant body, and the absence of flowers. However, seeds are not present in Pteridophyta.

Explanation:

Main plant body is diploid:
- The main plant body of Pteridophytes is known as the sporophyte. It is the dominant phase of the life cycle and is diploid, meaning it has two sets of chromosomes. The sporophyte is the visible part of the plant that we commonly recognize as a fern or horsetail.

Dominant phase is sporophytes:
- Pteridophytes have a life cycle that alternates between two phases: the sporophyte phase and the gametophyte phase. The sporophyte phase is the dominant phase, meaning it is the larger and more visible stage of the life cycle. It produces spores through the process of meiosis, which are then dispersed to form new gametophytes.

Flowers are absent:
- Pteridophytes do not produce flowers. Instead, they reproduce through the production of spores. These spores are produced in structures called sporangia, which are typically found on the undersides of fern fronds or in cone-like structures in horsetails. The spores are released and develop into gametophytes, which produce eggs and sperm for sexual reproduction.

Seeds are present (NOT true):
- Unlike flowering plants (Angiosperms) and gymnosperms (such as conifers), Pteridophytes do not produce seeds. Instead, they rely on spores for reproduction. Spores are single-celled structures that are produced by the sporophyte and are capable of developing into a new gametophyte. The gametophyte then produces eggs and sperm, which combine to form a new sporophyte.

In conclusion, the statement that seeds are present in Pteridophyta is not true. Pteridophytes reproduce through spores, not seeds. The main plant body is diploid, and the dominant phase is the sporophyte. Flowers are absent in Pteridophyta.