Answer:
Vessels, Tracheids.
Explanation:
The main difference between gymnosperm and angiosperm is how their seeds are grown. Angiosperm seeds are developed in the ovaries of the flower, and gymnosperm seeds are developed in the unisexual cones known as strobili, these plants do not contain flowers and fruits.
Vessel member or Tracheids is known as the type of cell which is present in xylem called water-conducting tissue of plants. Gymnosperm xylem is consists of Tracheids, and angiosperm xylem additionally contains vessels.