LIR Flashcards
What is the light independent reaction
The Calvin cycle
Where does the Calvin cycle occur?
The stroma
What does the storms contain?
-the enzyme RuBisCo which catalyses the resction
Why is this stage temperature sensitive?
-because it involves enzymes
What does the Calvin cycle use to form a hexose sugar?
-carbon dioxide, reduced NADP and ATP
What happens to the ATP during the reaction
-it is hydrolysed to provide energy for the reaction
What does the reduced NADP do during the reaction?
-donates the hydrogen to reduce molecules GP in the cycle
What happens during the Calvin cycle?
-Carbon dioxide reacts with ribulose biphosphate (RuBP) to form two molecules of gylcerate-3-phosphate (GP), a3 carbon compound. This reaction is catalysed by the enzyme Rubisco
-GP is reduced to triose phosphate (TP) using energy from ATP AND BYACCEPTING a H from reduced NADP
-
What happens to the carbon from TP?
-It leaves the cycle each turn to be converted into useful organic substances
What happens to the rest of the molecule?
-it is used to regenerate RuBP, with the energy from ATP
What can the product, glucose, be joined to form?
-disaccharides such as sucrose
-polysaccharides such as cellulose and starch
-can be converted to glycerol and combine with fatty acids to make lipids (for the plant)
What is a limiting factor?
-a factor that reduces the rate of photosynthesis
-e.g. carbon dioxide concentration. light intensity and photosynthesis
Agricultural practices that remove photosynthesis
-growing plants under artificial lighting to the maximum light intensity
-heating a greenhouse to increase the temperature
-burning fuel, such as paraffin burners to release more carbon dioxide
