Limiting Factors Flashcards

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1
Q

give the 3 limiting factors of photosynthesis?

A
  • light intensity
  • Carbon dioxide concentration
  • temperature
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2
Q

how does light intensity affect the rate of photosynthesis?

A
  • the higher the light intensity, the more energy there is for the light dependent reaction
  • faster the rate of photosynthesis
  • light needs to be the right wavelengths
  • so they look green because they reflect green light
  • they absorb red and blue
  • different pigments absorbs different wavelengths
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3
Q

how does carbon dioxide affect the rate of photosynthesis?

A
  • carbon dioxide needed for the light independent reaction
  • carbon dioxide is continuously the limiting factor (day twice)
  • carbon dioxide is about 0.04% of the atmosphere
  • optimum carbon dioxide concentration is 0.4%
  • above 0.4% - carbon dioxide has a negative effect on the rate of photosynthesis
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4
Q

how does temperature affect the rate of photosynthesis?

A
  • photosynthesis is controlled by enzymes
  • if you increase temperature, you increase the rate of reaction up to the optimum temperature
  • beyond the optimum temperature, the temperature decreases
  • high temp can cause the stomata to close -> carbon dioxide decreases
    therefore decreases the calvin cycle
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5
Q

how could someone increase light intensity?

A
  • use lighting at night (correct wavelength)
  • absorbs light to pass in
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6
Q

how could someone increase carbon dioxide?

A
  • burns fossil fuel in a greenhouse
  • increase carbon dioxide concentration
    e.g. propane
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7
Q

how could someone increase temperature?

A
  • burner increases temperature
    greenhouse traps warm air
  • heating/ cooling to maintain optimum temperature (thermostat)
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