AP BIOLOGY

Detailed explanation-1: -Pteridophyte is first terrestrial plant to have specialized conducting tissue-Xylem and Phloem. Xylem tissues are important for conduction of water and mineral in plants.

Detailed explanation-2: -Vascular plants (tracheophytes) differ from the nonvascular bryophytes in that they possess specialized supporting and water-conducting tissue, called xylem, and food-conducting tissue, called phloem.

Detailed explanation-3: -The Pteridophytes are the most primitive vascular plants, having a simple reproductive system lacking flowers and seed. Pteridophytes evolved a system of xylem and phloem to transport fluids and thus achieved greater heights than was possible for their avascular ancestors.

Detailed explanation-4: -In plants, xylem is the tissue responsible for the transport of water and minerals from the roots to all the parts of the plant.

Detailed explanation-5: -The main distinguishing feature of pteridophyta is the presence of vascular tissue for conduction. Indeed, pteridophytes are thought to be the first vascular plants to have evolved on Earth. Xylem and phloem are types of vascular tissue. However, these plants have only primitive xylem and phloem.