AP BIOLOGY

Detailed explanation-1: -But, since the amount of CO2 in the air is very less, it acts as a limiting factor for photosynthesis.

Detailed explanation-2: -Hence, a rise in light intensity has no affect on the rate of photosynthesis as the other factors such as temperature and carbon dioxide become limiting.

Detailed explanation-3: -Low oxygen reduced respiratory losses from leaves and reduced the proportion of soluble carbohydrate converted to polysaccharide in all plant parts. Thus, low-oxygen environments decrease the utilisation of assimilates which then may lead to inhibition of photosynthesis. This content is only available as a PDF.

Detailed explanation-4: -Final answer: Factors which affect the rate of photosynthesis are carbon dioxide, water, sunlight and chlorophyll.

Detailed explanation-5: -Oxygen inhibits the photosynthesis of C3 plants at atmospheric CO2 concentration (Varburg effect). The main cause of this phenomenon is the competitive inhibition of RuBP carboxylation and stimulation of RuBP oxygenation, the latter resulting in formation of glycolate and photorespiratory CO2.