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Presentation on theme: "PLANTS."— Presentation transcript:


2 What Are Plants Multicellular Eukaryotes Cell walls- cellulose
Develop from multicellular embryos Carry out Photosynthesis using Chlorophyll a and b Include: trees, shrubs, grasses, mosses, ferns


4 Plant Life Cycle 2 phases-mitosis and meiosis alternate to produce two types of cells sporophyte -Diploid (2n)- spore producing plant Gametophyte- Haploid (n)- gamete producing plant Early plants(mosses/ferns) require water for reprod. Later plants use seeds Can be asexual or vegetative


6 What Plants Need To Survive
Sunlight- energy for photosynthesis Water + Minerals - photosynthesis Gas Exchange- CO₂ for photosynthesis Movement of Water/Nutrients- specialized tissue to move from roots to leaves Xylem phloem




10 Early Plants 1st plants evolved from – multicellular green algae (protist) Similarities: Photosynthesis Color Reproductive cycle Cell walls Pigments= chlorophyll DNA sequences

11 First Plants Mosses

12 Mosses evolve to form vascular plants
Vascular tissue- conduct water/nutrient through plant Ferns Cone bearing plants (conifers) Flowering plants(Angiosperms)


14 Classification of Plants
Based on Water conducting tissues Seeds Flowers

15 Bryophyta Depend on water for reproduction Lack vascular tissue
Use osmosis to draw up water ( few cm) Low growing Live in moist/shaded areas Types: Mosses, Liverworts, Hornworts

16 Mosses Habitat: areas with water Poor soils Harsh environments Rhizoids-long thin cells, anchor to ground, absorb water

17 Liverworts Reproduce: sexually/asexually
Asexually- Gemmae- multicellular reprod. structures-produced in Gemmae cup

18 Hornworts Reproductive structure- tiny green horn

19 Ferns/Relatives Seedless vascular plants Equisetum
Club mosses- Lycophyta Horsetails-Equisetum Ferns-pterophyta Depend on water for reprod. Equisetum Lycophyta

20 Ferns Rhizomes-underground stems Fronds- leaves

21 Seed Plants Gymnosperms- seeds directly on surface
Conifers and ancient palm like plants Angiosperms- flowering plants- bear seeds within layers of tissue

22 Reproduction- no water
Adaptations: Flowers/cones Pollen Protection of embryos in seeds

23 Cones/flowers- Gametophytes grow and mature in structures

24 Pollen- male gametophyte carried into female reprod. Structure by
wind animal insects

25 Seed- embryo of plant encased in protective covering surrounded by food supply
Seed coat- surrounds/protects contents Prevent drying out

26 Specialized structure for dispersal
Textured to stick Fleshy tissue to be eaten Wind dispersal

27 Gymnosperms “Naked Seed” Gnetophytes- Africa Cycads- palm-like
Ginkgoes-1 species left Conifers

28 Ecology of Conifers Developed needle shaped leaves with waxy coat to reduce the amount of moisture lost

29 Angiosperms “Enclosed seed”
Unique reproductive structures known as flowers Attract bees, moths, hummingbirds for transport of pollen Contain ovaries- surround and protect seeds-Ovary develops into fruit Fruit-wall of tissue surrounding seed Organisms eat fruit – spread seeds

30 Monocots/Dicots Fibrous roots Dicots Taproot

31 Woody/Herbaceous Plants
Woody-thick cell walls for support Trees, shrubs, vines Herbaceous-smooth, non-woody Dandelions, zinnias, petunias

32 Annuals/Biennials/Perennials
Life spans Annuals- live one year Biennials- complete life cycle in 2 years Perennials- live for many years

33 Venus Fly Trap Video

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