biology: Adaptations for survival

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biology: Adaptations for survival
2012-10-31 09:24:21

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  1. Adapatations
    Definition: a trait or feature of an organism that helps and organism survive or reproduce in its environment.

    • Behavioural: what we do
    • Structural: what we possess
    • Physiological: how our body functions
  2. Plant Adaptations
    Xylem: vascular tissue that conducts water and the woody element in the stem.

    Phloem: vascular tissue that conducts sugars and other metabolic products (food) downwards from the leaves.

    Stomata: any of the minute pores in the epidermus of the lead or stem of a plant, forming a slit of variable width that allows movement of gases in and out of the intercellular spaces.
  3. Respiration + Photosynthesis
    • R-
    • glucose + oxygen --- carbon dioxide + water + energy

    • P-
    • carbon dioxide + water (suns energy)  glucose + oxygen + water                             (chlorphyll)
  4. Components in the body
    Vein: takes blood back to the heart, therefore less muscle and elastic tissue. Presense of valve so no back flow.

    Artery: takes blood away from the heart. Lots of muscle for strength and lots of elastic for pressure.

    Capillary: takes oxygen and food back to cells and collects carbon dioxide and waste. Very tiny between cells. very think walls (1 cell thick). thich for easy diffusion.

    Red blood cells: takes oxygen to cells. high surfec aread. high haemaglobin. no nucleaus or mitochondira. 120 days then recycled.

    White blood cells: big and smurfy. engulf bacteria (immunity). move two cells out of capillaries.

    Platelets: clots up cuts and injuries. fragments of cell.

    Plasma: carry cells around body. distribute heat. is a liquid.