photosynthesis

    Cards (11)

    • what is the word equation of photosynthesis?
      carbon dioxide + water -> oxygen + glucose
    • what is the symbol equation of photosynthesis?
      6CO2 + 6H2O -> 6O2 + C6H12O6
    • how is the glucose used?
      the glucose produced by photosynthesis is used by the plant for energy (through respiration). it is stored in the plant as starch. this is an endothermic reaction - energy is transferred from the sun to the chloroplast in the plant.
    • what factors can affect the rate of photosynthesis?how?
      • temperature - the best temp. is about 30 degrees, anything above 40 degrees will slow photosynthesis down
      • amount of light - if there is more light photosynthesis happens faster
      • amount of CO2 - if there is more carbon dioxide photosynthesis will happen quicker
      • amount of chlorophyll - the more chlorophyll the more photosynthesis
    • How would you draw a graph for each of these factors: temp, carbon dioxide, light
      • temperature - increase until 40 degrees
      • carbon dioxide - increase at first but then draw a straight line (limited by lack of increase in temp or light)
      • light - increase at first but then draw straight line
    • define intensity
      the strength of the light arriving at a certain points
    • what is the disadvantage of always using the best balance of temperature and carbon dioxide?
      very expensive
    • how can you keep crops in perfect conditions?
      • heating
      • artificial lighting
      • extra carbon dioxide - gas can be pumped into the air
    • How can you show that a plant gives off oxygen during photosynthesis?
      Using a water plant, collect gas bubbles produced during photosynthesis. The gas will relight a glowing splint as it contains oxygen.
    • What are examples of lead adaptions which maximise the rate of photosynthesis?
      • broad leaves - maximise surface area
      • thin leaves - short diffusion distance
      • chlorophyll - trap light energy
      • veins - transport water (xylem), remove photosynthesis products (phloem)
      • air spaces - allow C02 in and 02 out
      • guard cells - control opening of stomata for gaseous exchange and prevent water loss
    • What is a limiting factor?
      An environmental factor which can restrict the rate of photosynthesis
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