Plants and photosynthesis

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  • Plants and photosynthesis
    • plant cell
      • all the things animal cells have
      • cell wall- cellulose- supports cell
      • permanent vacuole- cell sap-weak sugar and salts
      • chloroplasts- photosynthesis- contains chlorophyll
    • photosynthesis
      • produces glucose using light
        • carbon dioxide + water --> glucose + oxygen
        • 6co2 + 6h20 --> c6h12o6 + 6o2
        • glucose is used for:
          • repspiration- transfer of energy
          • making cellulose-support cell wall
          • making amino acids - that turn into proteins
          • stored as oils or fats
          • stored as starch- starch is insoluble so better for storage than glucose
      • limiting factors
        • not enough light
        • too little carbon dioxide
        • the temperature has to be warm but not above 45 degrees centigrade
    • tissues and organs
      • plant organs work together to make organ systems
        • organs are made of tissues
          • epidermal tissue- covers the whole plant
            • lower epidermis contains stomata- which let co2 diffuse directly into the leaf
          • palisade mesophyll tissue- part of leaf where most photosynthesis occurs
          • spongy mesophyll tissue- part of leaf where gas exchange happens
          • xylem and phloem- transport water, mineral ions and food around the plant
            • xylem- transports water and mineral ions, water journey is called the transpiration stream
            • phloem- transports food mainly glucose for immediate use and storage, process is called translocation
          • meristem tissue- found at the growing tips of shoots and roots, adaptable so helps the plant grow
    • rate of photosynthesis
      • inverse square law links light intensity and distance


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