Biology Revison mind map

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  • Biology
    • B2a
      • Cell organisation
        • LARGE MULTICELLULAR ORGANISMS are made up of ORGAN SYSTEMS
      • Plant structure and Photosynthesis
        • PLANT CELLS are organised into TISSUES and ORGANS
          • Plants are made of organs as:
            • STEMS
            • ROOTS
            • LEAVES
              • Leaves are made of:
                • MYSOPHYLL TISSUE
                • XYLEM AND PHLOEM
                • EPIDERMAL TISSUE
        • photosynthesis
          • EQUATION
            • CARBON DIOXIDE + WATER --> GLUCOSE + OXYGEN
          • Produces GLUCOSE using SUNLIGHT
          • Happens inside the CHLOROPLASTS
            • Chloroplasts cointain green substance calles CHLOROPHYLL
              • Which absorbs SUNLIGHT and uses its energy to convert CARBON DIOXIDE (from the air) and WATER ( from the soil) into GLUCOSE,
          • Happens in the leaves of all GREEN PLANTS
          • Rate of photosynthesis
            • Limiting factors at a particular time depends on the environmental conditions:
              • NIGHT -  The LIGHT  is a limiting factor
              • WINTER - Often the TEMPERATURE
            • Not enough Light slows the rate of reaction
            • Too little CARBON DIOXIDE also slows down the rate of reaction
      • How plants use glucose
        • For RESPIRATION
          • 1) Plants manufacture GLUCOSE in their LEAVES
          • 2) They then use some of the glucose for RESPIRATION
          • 3) This releases energy which enables them to CONVERT the rest of the  glucose into various OTHER USEFUL SUBSTANCES , which they can use to BUILD NEW CELLS and Grow.
          • 4) To produce some of these substances they also need to GATHER a few MINERALS from the soil.
        • Making CELL WALLS
          • GLUCOSE is converted into CELLULOSE for making strong CELL WALLS , especially in a rapidly growing plant
        • Making PROTEINS
        • Stored in SEEDS
        • Stored in as STARCHED

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