the rate of photosynthesis

• which three environmental variables can affect the rate of photosynthesis?

  temperature, light intensity ,and CO2 concentration
• how would a low level of chlorophyll in a plant's chloroplasts affect the rate of photosynthesis?

  the rate of photosynthesis would decrease ( this is because chloroplasts can't absorb as much light)
• why is the rate of photosynthesis often limited during the winter?

  during the winter, temperatures are much lower than the rest of the year and there are fewer hours of daylight, so both light availability and temperature will limit the rate of photosynthesis.