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A-Level Biology OCR A

Carbon Dioxide Photosynthesis Day Night Bc Summer Higher

Atmospheric CO₂ levels vary due to photosynthesis occurring only during the day (causing buildup at night), higher rates in summer, and an overall increase over years from fossil fuel combustion and deforestation.

I livelli di CO₂ atmosferica variano perché la fotosintesi avviene solo di giorno (causa accumulo di CO₂ di notte), è più alta in estate (più fotosintesi) e aumenta nel corso degli anni a causa della combustione di combustibili fossili e della deforestazione.

Front Explain why carbon dioxide levels in the atmosphere may vary throughout a 24 hour period, seasonally and over many years.
Back Carbon dioxide level fluctuation:
  • Photosynthesis only during the day - CO2 builds up at night bc respiration carried out day and night
  • CO2 conc is lower in summer and higher in winter bc rate of photosynthesis higher in summer than in winter
  • Over many years it increases due to combusiton of fossil fuels and deforestation

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