How does the whisk fern differ from most other plants? A.It does not have a vascular system.

B.It performs photosynthesis in its stem.

C.It grows in moist areas.

D.all of the above

The primitive nature of the whisk fern is underscored by its having flagellated sperm, unlike the more advanced flowering plants, the angiosperms. The simple branched stems of Psilotum recalls the structure of the rhyniophytes, and the whisk fern is unique among living vascular plants in its lack of roots and leaves.

After the donor DNA is introduced into an egg cell that had its nucleus removed, scientists use an electrical current to fuse the DNA with the empty egg.

As an alternative, certain chemicals can be used to mimic the effects of fertilization caused by the entry of a sperm cell.