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Chapter 29.5

Chapter 29.5. Primary Structure of Roots. AP Biology Spring 2011. Internal Structure Of Roots. The root’s structural organization is laid out in a seed The primary root pokes through the seed coat first . Internal Structure Of Roots.

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Chapter 29.5

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  1. Chapter 29.5 Primary Structure of Roots AP Biology Spring 2011

  2. Internal Structure Of Roots • The root’s structural organization is laid out in a seed • The primary root pokes through the seed coat first

  3. Internal Structure Of Roots • Cells in the apical meristem divide and then differentiate into the: • Root cap • Epidermis • Ground tissues • Vascular tissues Root

  4. Internal Structure Of Roots • Root cap: protects the apical meristem of the soft actively growing root as it pushes through the soil

  5. Internal Structure Of Roots • Root epidermis: extensions of root hairs, increase the roots surface area available for absorption of water and solutes

  6. Internal Structure Of Roots • Vascular Tissues: form a vascular cylinder arranged as a central column of primary xylem and phloem • Pericycle: surrounds vascular cylinder and consist of parenchyma cells that actively divide perpendicular to the root axis giving rise to lateral roots • Endodermis: innermost layer of the cortex, surrounds the pericycle and forces water into the cytoplasm of root cells

  7. Taproot and Fibrous Root Systems • Taproot system: • Most eudicots have a taproot • Consisting of the primary root and its lateral branches

  8. Taproot and Fibrous Root Systems • Fibrous root system: • Most monocots have a fibrous root • Primary root is replaced by adventitious roots with lateral branches • Adventitious roots arise from stem and lateral roots branch from them • Adventitious refers to any plant structure that forms at an unusual place, relative to most species

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