Chpater 35

Chpater 35 - Angiosperm structure o 3 basic organs...

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- Angiosperm structure o 3 basic organs Roots (root system) Fibrous: mat of thin roots Taproot: one large, vertical root o Has actively dividing area: apical maristem Stems (shoot system) Nodes: leaf attachment Internodes: stem segments Axillary bud: dormant, vegetative potential Terminal bud: apex of young shoot Apical dominance: inhibits axillary bud Leaves (shoot system) Blade – leave Petiole- attachment of leaf to stem - Plant Organ System o Dermal (epidermis) : single layer of cells for protection Cuticle o Vascular (material transport) Xylem: transports water and minerals from roots to shoots Tracheids and vessel elements o Xylem elongated cells dead at maturity o Tracheids are smaller than vessels Phloem: food from leaves to roots and fruits Sieve- tube members: phloem tubes alive at maturity capped by sieve plates Companion cells (nonconductiong) connected by plasmodesmata o Ground (photosynthesis, storage, support)
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This note was uploaded on 10/31/2011 for the course BIO 102 taught by Professor Robinson during the Spring '09 term at UPenn.

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Chpater 35 - Angiosperm structure o 3 basic organs...

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