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Plant Structure and Lifespan
Transcript of Plant Structure and Lifespan
carbohydrates are used in the 2nd year to grow flowers and to reproduce Structure and Lifespan Woody Plants Aerial stems and leaves die back to the ground in the winter in temperate climates All woody plants are perennials Herbaceous plants can be: annuals, biennials, or perennials http://www.vanmeuwen.com/flowers/flower-plants/herbaceous-border-plants/echinacea-purpurea/60867VM http://en.wikipedia.org/wiki/File:Crepuscular_rays_in_the_woods_of_Kasterlee,_Belgium.jpg Examples:
corn geraniums marigolds Examples:
Queen Anne's lace
foxgloves Example: Fir trees http://ledgeandgardens.typepad.com/ledge_and_gardens/2009/06/foxglove-.html http://www.davey.com/ http://opentreeoflife.org/ Aerial stems become dormant in the winter in temperate climates
Aerial stems remain; they don't die back in the winter In woody plants, the secondary tissues' cells walls contain lignin, making them harder than herbaceous plants Herbaceous plants are non-woody The cell walls of the secondary tissues do not contain lignin Life Cycle = 1 year or less Life Cycle = 2 years Life Cycle = more than 2 years Life Cycle = grow, reproduce, die Annuals are all HERBACEOUS plants http://www.npr.org/blogs/health/2010/10/27/130867440/corn-sweetener-in-soda-study-stirs-up-controversy All biennials are HERBACEOUS plants http://bonniecabbageprogram.com/students/growing-a-healthy-cabbage/ Perennials can be HERBACEOUS or WOODY HERBACEOUS:
Temperate Climates (and some tropical perennials) --
Aerial stems and leaves die back in the winter
Underground roots become dormant and grow anew in the spring
Tropical Climates --
Grows year-round WOODY:
Temperate Climates --
Aerial stems become dormant in the winter in temperate climates
Loses leaves in the fall, grows new stems and leaves in the spring
Continuously loses and grows new leaves Some can live for hundreds to thousands of years New stems build on existing permanent stems --> can become very big http://www.nwdanet.com/buy/8-object-packs/12-trees/49-fir-tree-pack Unfavorable Conditions New leaves and stems grow in the spring when it is warm
Tropical perennials grow year round because it's always warm Herbaceous:
Temperate and Tropical (when there's long dry seasons)--
Lose their aerial stems in the winter; Underground stems and roots go dormant so it can use less resources to survive in the cold or dry environment
Woody plants lose their leaves and their stems go dormant in the winter to conserve resources http://www.youtube.com/watch?v=sZVZ2l7bm_U http://wallpaperstock.net/two-spring-leaves_wallpapers_11823_1024x768_1.html http://favim.com/image/473525/