Roots | Plant Form and Physiology | Unit 6. Plant Structure and Function
Chapter: Roots
Collection: Plant Form and Physiology
Unit 6. Plant Structure and Function
Book: Biology
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Roots help to anchor a plant, absorb water and minerals, and serve as storage sites for food. Taproots and fibrous roots are the two main types of root systems. In a taproot system, a main root grows vertically downward with a few lateral roots. Fibrous root systems arise at the base of the stem, where a cluster of roots forms a dense network that is shallower than a taproot. The growing root tip is protected by a root cap. The root tip has three main zones: a zone of cell division (cells are actively dividing), a zone of elongation (cells increase in length), and a zone of maturation (cells differentiate to form different kinds of cells). Root vascular tissue conducts water, minerals, and sugars. In some habitats, the roots of certain plants may be modified to form aerial roots or epiphytic roots.
00:00 Roots
00:29 Types of root systems
01:37 Root growth and anatomy
04:52 Root modifications
06:00 Section summary
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