AP BIOLOGY

Detailed explanation-1: -Pteridophytes have a well-differentiated plant body into root, stem and leaves. They have a vascular system for the conduction of water and other substances.

Detailed explanation-2: -Vascular plants have roots, stems and leaves.

Detailed explanation-3: -Roots, stems and leaves are three plant organs. Most roots grow underground. Roots hold a plant in the soil. Roots also take in water and dissolved minerals from the soil, and in some plants, food is stored in the roots.

Detailed explanation-4: -The ferns, gymnosperms, and flowering plants are all vascular plants. Because they possess vascular tissues, these plants have true stems, leaves, and roots.

Detailed explanation-5: -Plants with no roots, but have stem and leaves are Psilotum. They belong to the Pteridophytes. Commonly they are called the whisk ferns, they are considered as primitive pteridophytes as they lack roots.