plant structure organs
Download
Skip this Video
Download Presentation
Plant Structure: Organs

Loading in 2 Seconds...

play fullscreen
1 / 11

Plant Structure: Organs - PowerPoint PPT Presentation


  • 940 Views
  • Uploaded on

Plant Structure: Organs Organs composed of 1 or more tissues Plant organs 3 major types: roots stems leaves Flowers and fruits evolved from stems and leaves Plant Structure: Roots 4 zones of growing root Root cap : protect tip of root; secretes lubricant Root structure

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Plant Structure: Organs' - lotus


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
plant structure organs
Plant Structure: Organs
  • Organs composed of 1 or more tissues
  • Plant organs
  • 3 major types:
  • roots
  • stems
  • leaves
  • Flowers and fruits evolved from stems and leaves
plant structure roots
Plant Structure: Roots
  • 4 zones of growing root
  • Rootcap: protect tip of root; secretes lubricant
  • Root structure
  • Celldivision: apical meristem; production of new cells
  • Cellelongation: expansion of cells due to enlarging vacuole
  • Cellmaturation: specialization of cells
  • root hairs
  • storage
  • vascular tissue
plant structure roots3
Most water absorbed by root hairsPlant Structure: Roots
  • Uptake of water and nutrients
  • Main functions of roots
  • Anchor and support
  • Water and nutrient uptake
  • Root hairs are projections of epidermal cells
  • Substantially increase surface area of roots
plant structure roots4
Plant Structure: Roots
  • Fibrous, multibranched roots (e.g. lettuce)
  • Dominant tap root
  • Root types
  • Tap roots used to absorb water deep in soil
  • Some tap roots used to store carbohydrates (e.g. carrots)
  • Adventitious roots
  • root-like structures arising from stems or leaves
  • e.g. prop roots (e.g. corn) and holdfasts (e.g. poison ivy)
  • Tuberous roots
  • Swollen structure on fibrous root used to store carbohydrates (e.g. sweet potato)
plant structure stems
Stem StructurePlant Structure: Stems
  • Nodes: location of leaves on stem
  • Stems
  • Internodes: stem between leaves
  • Buds: undeveloped leaves or flowers
  • Terminal (apical)
  • axillary (lateral)
  • Apical dominance is growth inhibition caused by apical bud
plant structure stems6
Plant Structure: Stems
  • Functions
  • Support leaves, flowers, fruits
  • Stems
  • Transport of water (xylem) and products of photosynthesis (phloem)
  • Storage of carbohydrates
  • Tubers = swollen underground stems that store carbohydrates (e.g. potato; eyes are axillary buds)
  • Corm = swollen base of stem covered in papery leaves ( e.g. crocus)
  • Bulb = cluster of fleshy leaves attached to short, thick stem with basal roots (e.g. onion)
  • Bulbils = tiny bulbs arising in leaf axils (e.g. lily)
  • Rhizome = horizontal stem below ground that produces roots and shoots at each node ( e.g. iris, ferns)
plant structure stems7
Plant Structure: Stems
  • Examples of stems modified for storage
  • Stems
plant structure stems8
Plant Structure: Stems
  • Stems used only for asexual reproduction
  • Stolon (or runner) = horizontal stem that arises from leaf axil and runs above ground (e.g. strawberry, spider plant)
  • Stems
  • When tip of stolon hits ground a new plant forms
plant structure stems9
Sucker = stem arising from root tissue, often from cut woody plantPlant Structure: Stems
  • Other types of modified stems
  • Spur = stem with short internodes growing from a larger branch of woody plant
  • Stems
  • Waterspout = stem that arises from latent buds in branches of woody plants
plant structure stems10
Plant Structure: Stems
  • Other types of modified stems
  • tendrils = twining stems used to secure climbing plants to vertical surfaces (e.g. peas, grapes)
  • Stems
  • prickles = tiny, pointed projections of epidermis tissues of stems (e.g. blackberry)
  • thorns =long, pointed projections produced in leaf axils (e.g. Hawthorn)
  • cladophylls =stems modified for photosynthesis (e.g. cacti, asparagus)
plant structure stems11
Plant Structure: Stems
  • Examples of other modified stems
  • Stems
ad