Plant Structure And Growth
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1 Plant Structure And Growth
2 The Plant Body is Composed of Cells and Tissues Tissue systems (Like Organs) made up of tissues Made up of cells
3 Plant Tissue Systems Ground Tissue System Ø photosynthesis Ø storage Ø support Vascular Tissue System Ø conduction Ø support Dermal Tissue System Ø Covering
4 Ground Tissue System Parenchyma Tissue Collenchyma Tissue Sclerenchyma Tissue
5 Parenchyma Tissue Made up of Parenchyma Cells Living Cells Primary Walls Functions photosynthesis storage
6 Collenchyma Tissue Made up of Collenchyma Cells Living Cells Primary Walls are thickened Function _Support
7 Sclerenchyma Tissue Made up of Sclerenchyma Cells Usually Dead Primary Walls and secondary walls that are thickened (lignin) Fibers or Sclerids Function Support
8 Vascular Tissue System Xylem H 2 O Tracheids Vessel Elements Phloem - Food Sieve-tube Members Companion Cells
9 Xylem Tracheids dead at maturity pits - water moves through pits from cell to cell Vessel Elements dead at maturity perforations - water moves directly from cell to cell
10 Sieve-tube member Companion Cell (on the side) Phloem Sieve-tube members alive at maturity lack nucleus Sieve plates - on end to transport food alive at maturity helps control sieve-tube member cell Companion Cells
11 Dermal Tissue System Epidermis Single layer, tightly packed cells Complex Tissue Does different things in different areas (roots vs. leaves) usually transparent secretes cuticle Periderm replaces epidermis in woody plants protection
12 Plant Systems Root System Tap Root Lateral Roots Shoot System Stems Nodes (leaves are attached) Internodes Leaves blades petioles Buds Terminal (apical) Axillary
13 Plant Growth Meristematic Tissue generates cells for new growth (like stem cells in animals) apical meristems lateral meristems
14 Apical Meristems increases length called primary growth Protoderm - gives rise to dermal tissue - Ground Meristem gives rise to ground tissue Procambium - gives rise to vascular tissue
15 Lateral Meristems increases girth called secondary growth - Vascular Cambium produces secondary xylem and secondary phloem - Cork Cambium produces cork (outer most layer of bark)
16 Pine Tree w/ 8 Cotyledons!
17 The Root System Functions anchor plant absorb minerals, water and nutrients store food Systems Tap roots - one large root with smaller lateral roots (dicots) Fibrous roots - threadlike roots (monocots)
18 Root Structure Four Regions Root Cap protection, also secrete polysaccharide slime to lubricate Region of - Cell Division new cells Region of Elongation - cells get longer Region of Maturation - cells begin to specialize
19
20 Root Tissue Protoderm - gives rise to the epidermis Ground Meristem Cortex (external to vascular tissue) Procambium - gives rise to the Stele (the vascular tissue of a root or stem) xylem and phloem may include pith (parenchyma cells surrounded by vascular tissue)
21 Dicot Root vs. Monocot Xylem (larger, in red) Endodermis Phloem (smaller, greenish) Pericycle one layer IN from endoderm, gives rise to lateral roots Pith central core of parenchyma cells surrounded by xylem and phloem
22 Modified Roots Food Storage carrots, sweet potatoes, yams Water Storage pumpkin family Propagative Roots cherries, pears Pnematophores mangroves Aerial Roots orchids Buttress Roots tropical trees Haustoria dodder
23 Shoot System
24 The Shoot System Made up of Stems, Leaves, Flowers, Fruits Stems - support, conduction, growth Leaves - photosynthesis Flowers - pollination Fruits - seed protection, dispersal
25 Stems (Primary Growth) Protoderm - gives rise to the epidermis Procambium - gives rise to the stele xylem and phloem in vascular bundles dicots - found in ring monocots - scattered throughout includes pith in dicots Ground Meristem Cortex
26 Vascular Bundle stele (vascular tissue) divided into strands in stems and leaves Sclerenchyma cells Phloem Xylem
27 Dicot Stem Vs. Monocot (35.16) Vascular Bundle Ground Tissue (Pith) (Cortex) How can you tell root from stem?
28 Stems (Secondary Growth) Occurs to increase girth (thickness) Vascular Cambium produces secondary xylem and secondary phloem Cork Cambium produces cork and phelloderm (thin layer of parenchyma cells) together these structures are called periderm (Cork Cambium, cork, phelloderm)
29 Secondary Growth Derivative Vascular cambium
30
31 Secondary Growth of a Stem
32 Secondary Growth of a Stem (Inside to Outside) Pith Primary Xylem Secondary Xylem (wood) Vascular Cambium Periderm Secondary Phloem Primary Phloem Cortex Phelloderm Cork Cambium Cork (outer layer of bark)
33 Older, inner layers of 2 Xylem no longer transport water Younger, outer layers of 2 Xylem still function in transport All tissue outside vascular cambium Missing cortex and phelloderm!
34
35 Springwood (Early) growth occurs more quickly. Cells are large and thin walled and have less strength. Summerwood (Late) growth occurs more slowly. Cells are thicker, more dense, and stronger.
36 Secondary Growth of a Stem
37 Modified Stems Stolons - horizontal stems above the ground (strawberries) Rhizomes - horizontal stems below the ground (Irises) Tubers - swollen areas of rhizomes or stolons (Potatoes) Bulbs & Corms - vertical shoots under ground (onions, garlic w/ mod storage leaves) Cladophylls - cactus pads
38 Leaf Structure
39 Epidermis Leaves Stomata - openings on underside of leaf Guard Cells - surround stomata Cuticle - waxy coating excreted by epidermis Mesophyll - middle of leaf Palisade Layer - photosynthesis Spongy layer - gas exchange
40 Modified Leaves - Tendrils attachment Bracts modified leaves that surround a group of flowers Spines - protection Storage Leaves - succulents
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