Presentation on theme: "What is a plant??? Organism that is: Multicellular Eukaryote"— Presentation transcript:
1 What is a plant??? Organism that is: Multicellular Eukaryote AutotrophicHas Cell wallPhotosynthesizes
2 Plants evolved from Green Algae Brainstorm with a neighbor:What are differences between algae and plants?
3 Challenges from life in water to life on land Obtain resources from BOTH air and soilRoots: below ground and absorb nutrients and waterShoots: above ground and convert sunlight and CO2 to energyVascular system: moves water and nutrients between roots and shoots.
5 Challenges from life in water to life on land Remaining upright and not falling overLignin: chemical that hardens the cell wall to give strength and support to plants.
6 Challenges from life in water to life on land Maintaining MoistureCuticle: Lipid, waxy covering that prevents water evaporationStomata: Pores on underside of leaf that regulates water and gas exchangeGuard cells: open and close the stomata
8 Challenges from life in water to life on land Reproduction on landNeed ways to prevent seeds from drying and ways to disperse
9 BRYOPHYTES Moss Lack lignin and are considered non vascular plants Require water to reproduce because gametes have flagella
10 Pteridophytes First group of plants to have vascular tissue (lignin) Able to grow taller nowFerns, horse tailsReproduce through spores on underside of leaf and no longer dependent on water
11 Gymnosperms First seed bearing plants Conifers and needle leaf trees Naked seeds because they are not surrounded by fruit.Conifers and needle leaf trees
12 Pollen cone Pollen grains Pine cone Seeds Male reproductive structure Male gamete, adapted to dry environment and transport through wind.Pine coneFemale reproductive structureSeedsPlant embryo packaged with food supply inside a protective coat.
13 ANGIOSPERM Flowering plants Fruit: Ripened ovary used to protect seeds and disperse them.
14 Parts of a Flower Petals Stamen Brightly colored to attract pollinatorsStamenMale reproductive structureAnther: holds pollenMale gameteFilament: holds up anther.
15 Parts of a Flower Carpel Female reproductive structure stigma: sticky to catch pollenStyle: long tube that connects stigma and ovaryOvary: holds ovules (eggs)
16 How do Plants Reproduce? PollinationRely on animals to transport pollen from male to female reproductive structure.Brightly colored petals attract pollinatorsDouble Fertilization:When pollen travels down style it splits into 2 sperm cells1 fertilizes the ovule to create seedOther creates food supply
17 Seed DispersionOnce pollination has occurred seeds need to spread to allow for new plant growthBurrs can stick to animals and moveFruit can be eaten and then the core thrownSome seeds need to be completely digested in order to grow.Water currents and wind.
18 Annuals: Go through a complete life cycle in one year. Baby blue eyes basilMerigoldstomato
19 biennialsTakes two years to complete the life cycle.English daisy
20 Perennials Take several years to complete their life cycle. agave Cat tailsBaby’s breath
21 Roots Found underground Anchor plant Hold soil in place Absorb water and nutrients.
22 Types of RootsFibrous RootsSEVERAL THIN BRANCHING ROOTS
23 Types of Roots Fibrous Tap roots Long root to anchor plant Several small horizontal root hairs.
24 SHOOTS STEM LOCATION OF LIGNIN XYLEM AND PHLOEM TO MOVE WATER AND NUTRIENTS THROUGH PLANT.
25 LeafLocation of photosynthesis2 partsPetioleBlade
26 Types of Tissue in Plants Dermal TissueActs as a protective barrier for the plant.Secretes the cuticle.Outer most layer of tissue.
27 Vascular TissueContains lignin to give support.XYLEM: transport water and nutrients from roots to shootsTranspiration is the evaporation of water through leaves that drives the process
28 Vascular Tissue.PHLOEM: transports sugars due to diffusion (high concentration to low concentration).
29 Ground tissue Tissue found between dermal and vascular tissue. Most abundant tissue typeLocation of photosynthesis
30 Primary growth Growth upwards and downwards in height. Occurs at root caps and buds in plants.
31 Secondary growth Growth in width outwards. Adds new xylem and phloem. Every 2 rings = 1 year of growth for tree rings.