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Chapter 7 Nutrition in Plants Lesson 1 - Structure of plants and leaves, Gaseous exchange in plants
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Chapter 7 Nutrition in Plants Lesson 1 - Structure of plants and leaves, Gaseous exchange in plants

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    Chapter 7 Nutrition in Plants Lesson 1 - Structure of plants and leaves, Gaseous exchange in plants Chapter 7 Nutrition in Plants Lesson 1 - Structure of plants and leaves, Gaseous exchange in plants Presentation Transcript

    • Nutrition in Plants Chapter 7
      • Give the word equation of photosynthesis
      Recall:
      • Give the chemical equation of photosynthesis
      Carbon dioxide + water glucose + oxygen + water 6CO 2 + 12H 2 O C 6 H 12 O 6 + 6O 2 + 6H 2 O chlorophyll sunlight chlorophyll sunlight
    • Importance of photosynthesis
      • During photosynthesis, carbohydrates formed can be converted to fats, protein and other organic compounds  food for animals
      • Allows animals who feed on plants to obtain energy as photosynthesis converts energy from the sun to chemical energy
      • Fossil fuels are a store of energy derived from sunlight through photosynthesis
      • Maintains O 2 and CO 2 balance in atmosphere
    • Lesson Objectives:
      • To name the various parts of a plant
      • Structure of the leaf
      • Adaptations of the leaf to plant survival
    • What is a plant?
      • Like you, plants:
      • are made of cells.
      • need food to get energy and materials with which to grow
      • respond to the environment with many behaviors
      • Unlike you, plants:
      • can make their own high energy food from low energy molecules
      • can keep growing and can often replace missing body parts
      • do not have nerves or muscles, so they cannot think, feel or move
    •  
    •  
    •  
    • Venation branch veins mid-rib vein network
    • Label the parts of a leaf
    • Refer to page 129 textbook (no chloroplasts) (no chloroplasts)
    • Leaf Structure
    • Label the cells in the leaf upper epidermis lower epidermis stoma palisade mesophyll spongy mesophyll Intracellular spaces cuticle
    •  
    • Main site of photosynthesis
      • The mesophyll which lies below the upper epidermis is the main site of photosynthesis
      • Consists of 2 regions:
        • Palisade tissue
        • Spongy mesophyll
      Cells contain numerous chloroplasts which enable them to absorb max. sunlight for photosynthesis
    • Stomata
      • Minute openings bounded by 2 guard cells
      guards cells stoma
    • Guard cells
      • Bean-shaped
      • Contain chloroplasts
      • Only epidermal cells that can make sugars
      • Regulates the loss of water and gaseous exchange in the leaves of a plant
      How?
    • Structure of stomata
    • Action of guard cells
      • The water potential in the guard cells is lowered by
      • i) sugars produced during photosynthesis
      • ii) high K + ions (increased with sunlight exposure)
      • Water enters the guard cells by osmosis
      • Guard cells swell and become turgid
      • Because the guard cells have a thicker cellulose cell wall on one side of the cell (the side around the stomatal pore)  the swollen guard cells become more curved and pull the stoma open
    •  
    • Gaseous exchange in the leaf of a plant
      • The exchange of oxygen and carbon dioxide in the leaf (as well as the loss of water vapour ) occurs through pores called stomata (singular = stoma)
      Gaseous exchange in the leaf of a plant Back http:// web.ukonline.co.uk/webwise/spinneret/plants/leafst.htm
    • Entry of carbon dioxide In daylight, photosynthesis occurs Carbon dioxide rapidly used up Carbon dioxide concentration in leaf becomes lower than atmospheric air Diffusion gradient exists Carbon dioxide diffuses from the external environment through the stomata into the air spaces in the leaf Film of water on surface of mesophyll cells so that carbon dioxide can dissolve; dissolved carbon dioxide diffuses into the cells
    • Activity:
      • Predict why oxygen diffuses out of the leaf and into the atmosphere.
    • How do we distinguish between the xylem and phloem?