Botany: Part I Overview of Plants & Plant Structure
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1 Botany: Part I Overview of Plants & Plant Structure
2 Plant evolution
3 Plant Evolution Chlorophytes Bryophytes (nonvascular plants) Seedless vascular plants Gymnosperms Angiosperms Chlorophytes are a green algae that are considered the common ancestor of all land plants.
4 Characteristics of Land Plants Eukaryotic Autotrophs Cell Wall - cellulose Alternation of Generations Embryophytes protected embryo 4
5 Photosynthetic Autotrophs 5
6 Alternation of Generations 6
7 Key Haploid (n) Diploid (2n) Alternation of Generations MEIOSIS Spore dispersal Sporangium Sporangium Mature sporophyte (2n) Sorus Fiddlehead (young leaf)
8 Alternation of Generations Key Haploid (n) Diploid (2n) MEIOSIS Spore dispersal Spore (n) Young gametophyte Rhizoid Antheridium Sporangium Underside of mature gametophyte (n) Archegonium Sperm Sorus Sporangium Mature sporophyte (2n) Egg FERTILIZATION Fiddlehead (young leaf)
9 Alternation of Generations Key Haploid (n) Diploid (2n) MEIOSIS Spore dispersal Spore (n) Young gametophyte Rhizoid Antheridium Sporangium Underside of mature gametophyte (n) Archegonium Sperm Sorus Sporangium Mature sporophyte (2n) New sporophyte Zygote (2n) Egg FERTILIZATION Gametophyte Fiddlehead (young leaf)
10 Four Groups Bryophytes Ferns Gymnosperms Angiosperms
11 Adaptations for Moving on to Land Prevention from dehydration-evolution of waxy cuticle Method of gas exchange for photosynthesis-evolution of stomata and lenticels. Method to obtain water and minerals-evolution of roots Increase in size and support-evolution of xylem fortified with lignin Method of reproduction without water-evolution of pollen and pollination strategies. Method of protecting embryo from dehydration- Evolution of the seed 11
12 Adaptations for Moving on To Land Prevention from dehydration-evolution of waxy cuticle Method of gas exchange for photosynthesis- Evolution of stomata and lenticels. Method to obtain water and minerals-evolution of roots 12
13 Bryophytes Nonvascular land plants Mosses, liverworts and hornworts Gametophyte (n) is photosynthetic, dominant generation Typically groundhugging plants (Why?) 13
14 Ferns Seedless vascular plants Horsetails and ferns Sporophyte (2n) is dominant generation Most common in damp areas due to flagellated sperm that must swim to reach eggs 14
15 Gymnosperms Naked seeds not enclosed in ovaries Conifers, ginkgos, and cycads Sporophyte (2n) is the dominant generation Seeds are exposed on modified leaves that usually form cones 15
16 Flowering plants Pecan trees, roses, peach trees, tomatoes Sporophyte (2n) generation is dominant Flowers and fruit Most abundant of all plant species Angiosperms 16
17 Plant Structure and Function A simple body plan underlies the diversity of plant forms that exist today. 17
18 Hierarchy of Plant Organization Systems - root and shoot Organs roots, stems, and leaves. 18
19 Organ Systems: 19
20 Organs: Roots Roots anchor a vascular plant to the soil, absorb minerals and water, and often store carbohydrates 20
21 Root Adaptations Each of these evolutionary root adaptations increase plant survival in a given environment.
22 Organs: Stems the main photosynthetic organs Stems lift leaves and reproductive structures 22
23 Stem Adaptations Some plants have stems with additional functions, such as food storage and asexual reproduction. These are examples of modified stems.
24 Organs: Leaves Leaves the main photosynthetic organs
25 Types of Leaves
26 Leaf Adaptations Some plant species have leaves with adaptations that function in support, protection, storage, or reproduction in addition to photosynthesis.
27 Plant Tissues Tissue Components Function Dermal Ground Vascular Epidermis Periderm Parenchyma Collenchyma Sclerenchyma Phloem Xylem Protection Prevent water loss Metabolism Storage Support Transport water and products of photosynthesis
28 Location of Tissue Types Which tissue type in most abundant in plants? How is this representative of form fits function?
29 Dermal Tissue Forms epidermis, usually one cell layer Some cells differentiate: Stomata pores for gas exchange Trichomes leaf hairs, protect against herbivores and damaging solar radiation Root hairs increase root surface area Epidermal cells of the shoot system secrete a waxy cuticle that limits water loss, reflects damaging solar radiation, and form a barrier against pathogens
30 Ground Tissue Ground tissue is the most abundant tissue Cells differentiate: Parenchyma most abundant, carry out photosynthesis, store protein and starch Collenchyma elongated, thick cell walls, provide support Sclerenchyma thick cell walls reinforced with lignin, programmed cell death, cell walls remain to provide support
31 Vascular Tissue Transport System Xylem carries water and minerals from roots to rest of plants, composed of dead cells Phloem is composed of living cells, moves carbohydrates from production sites to where they are either used or stored
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