biology 22 3[1]
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22-3 Seedless Vascular Plants
Chapter 22 Plant Diversity
Vascular Tissue
• Type of plant tissue specialized to conduct water and nutrients throughout a plant.
Tracheid
• Hollow plant cell in xylem tissue with thick cell walls that resist pressure.
Xylem
• Vascular tissue that carries water upward from the roots to every part of a plant.
Phloem
• Vascular tissue responsible for the transport of nutrients and the carbohydrates produced by photosynthesis.
Lignin
• Substance in vascular plants that makes cell walls rigid.
Root
• Underground organ in plants that absorbs water and minerals.
Leaf
• Photosynthetic organ that contains one or more bundles of vascular tissue
Vein
• In plants, a cluster of vascular tissue in leaves; in animals, a blood vessel that returns blood to the heart
Stem
• Supporting structure that connects roots and leaves and carries water and nutrients between them
Rhizome
• Creeping or underground stem in ferns
Frond
• Large leaf of a fern
Sporangium
• Structure in ferns and some fungi that contains spores
Sorus
• Cluster of sporangia on the underside of a fern frond
Key Concept
• Both forms of vascular tissue—xylem and phloem—can move fluids through the plant body, even against the force of gravity.
Key Concept
• Seedless vascular plants include club mosses, horsetails, and ferns.
Key Concept
• Ferns and other vascular plants have a life cycle in which the diploid sporophyte is the dominant stage.