B3 - Plant nutrition summary


  • Created by: Yumin LEE
  • Created on: 24-02-19 22:15
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  • Plant Nutrition
    • Nutrition
      • Plant & Animal
        • Animal - cannot make their own food
        • Plant - can make their own food by photosynthesis etc.
      • Taking useful substance
      • Organic
        • Inorganic substance - light, carbon dioxide, water and minerals
        • Organic - Substance made by living things
    • Photosynthesis
      • Definition- the process by which plants manufacture carbohydrates from raw material
        • Photo (light) / Synthesis (manufacture)
      • Chlorophyll
        • Green pigment which makes plant looks green
        • Sunlight can be trapped by chlorophyll molecules
        • Inside chloplast
          • Chloroplast
            • enzymes & chlorophyll
        • light energy -> chemical energy
      • Leaf structure
        • appearence
          • Lamina - main part of leaf
          • Petiole - leaf stalk
        • Transverse section
          • upper part
            • Cuticle - waxy cuticle, stops water evaporating
            • Upper epidermis cell - do not contain chloroplast / Protecting the inner layer /  secretes waxy cuticle
          • Mesophyll layer
            • Palisade mesophyll
              • The cells nearer to the top of the leaf
              • Containing Chloroplast (Photosynthesis)
              • Arranged quite fence or palisade for photosynthesis from light
            • Spongy mesophyll
              • Arranged quite loosely
                • For photosynthesisi from carbon dioxide
          • Lower part
            • Lower epidermis
              • Stoma(ta)
                • sausage shaped
                • can open or close the hole
                  • Gas exchange => Carbon dioxide diffuses in & Oxygen diffuses out
                • containg chloroplast
          • Vascular bundle
            • Xylem (vessel)  - carrying food
            • Phloem (tube) - carrying away sucrose and other substance that the leaf has made
      • Leaf adaptation
        • Carbon dioxide
          • 0.04% in the atomsphere - efficient at absorbing
            • Stomata
            • Large surface area
            • Mesophyll layer
              • arranged quite loosely
                • diffuses well
        • water
          • From the soil / by osmosis
            • Root cap / Root hair
          • Xylem vessel - within short distance
            • to supply water to the all cells
        • Sunlight
          • Flat surface
            • obtain sunlight
          • thin surface
            • sunlight to pentrate right through it
            • to reach all the cells
            • Arranged palisade cell
              • To get sunlight as possible
            • Supported by stem and petiole
              • to expose as much as possible to the sunlight and air
        • Phloem tube within short distance of every mesophyll cell
          • to take away organic products of photosynthesis

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