bioenergetics

Cards (78)

  • Photosynthesis word equation

    Carbon Dioxide + Water >(light)> Glucose + Oxygen
  • Photosynthesis symbol equation

    6CO2 + 6H2O >(light)> C6H12O6 + 6O2
  • where does photosynthesis take place?
    in chloroplasts
  • What do cholorplasts contain?
    chlorophyll
  • Chlorophyll
    A green pigment found in the chloroplasts of plants, algae, and some bacteria
  • Is photosynthesis endothermic or exothermic?

    Endothermic - energy is transferred from the environment
  • What 5 things is glucose used for in plants?
    Respiration, making cellulose, making amino acids, stored as oils and fats, stored as starch
  • What is cellulose used for?
    plant cell walls
  • how are amino acids made?
    combining glucose and nitrate ions
  • glucose is turned into (s)
    Starch and stored in roots and stems
  • glucose is turned into (l)
    lipids and stored as seeds
  • Limiting factors of photosynthesis
    light intensity,carbon dioxide concentrationandtemperature
  • When is light the limiting factor?
    night time
  • When is temperature the limiting factor?
    winter
  • when it's warm and bright enough, what's the limiting factor?
    CO2 concentration
  • what is the amount of chlorophyll affected by?
    disease or lack of nutrients
  • why does lack of/damaged chlorophyll/chloroplasts affect photosynthesis?

    can't absorb as much light
  • not enough light
    slows down rate of photosynthesis
  • too little carbon dioxide
    slows down rate of photosynthesis
  • why does temperature affect the rate of photosynthesis?
    it affects enzymes
  • when are the enzymes destroyed in plants?
    45 degrees celcius
  • what can be used to measure the effect of light intensity on the rate of photosynthesis?
    pondweed
  • the more oxygen bubbles produced
    the greater the rate of photosynthesis
  • What is the independent variable in the pondweed experiment?
    distance of lamp
  • Sodium hydrogencarbonate dissolved in water
    can be used to measure effect of CO2 on photosynthesis
  • what does the inverse square law link?
    Light intensity and distance
  • light intensity is------------to distance
    inversely proportional
  • light intensity=

    1/distance^2
  • what is the light intensity when the distance from lamp is 10cm?
    1/100 = 0.01 a.u
  • a.u
    arbitrary units
  • how do greenhouses ensure temperature is not a limiting factor?
    trap the sun's heat
  • what do greenhouses use in winter?
    heaters
  • how can greenhouses be kept cool?
    shade and ventilation
  • how to ensure light is not a limiting factor?
    artificial UV light
  • how to increase CO2 concentration?
    paraffin heater makes CO2 as by-product
  • what are the benefits of keeping plants enclosed?
    free from disease and pests
  • fertilisers
    provide minerals
  • respiration
    the process of transferring energy from glucose which occurs in every cell
  • what type of reaction is respiration?
    exothermic- it transfers energy
  • aerobic respiration word equation
    glucose + oxygen > carbon dioxide + water (energy is transferred)