Factors that effect photosynthesis Flashcards
whatare limiting factors
factors that reduce the rate of photosynthesis
examples of limiting factors
light intensity, carbon dioxide avaliability, water avaliabilty and temperature
how does water affect photosynthesis
its needed as an input and a lack of water makes plants plants lose their turgor and their stomata close, preventing gas exchange, including the absorption of CO2
chlorophyll b
chlorophyll that is an adaptation to the shade, is an accessory piment that absorbs lights and passes the energy to chlorophyll a
carotenoids
accessory pigment that absorbs orange light and pases the energy to chlorophyll a
how does light intensity affect photosynthesis
light is required in the light dependent stage of photosynthesis to provide energy required to split thw water molecules into hydrogen and oxygen
graph of light intensity
there is a point reached where increasing light intensity does not include the rate of reaction, called light saturation, the graph then platoes
light saturation
occurs when more ATP and NADPH are produced that is required by the light independent
light compensation
the light insenity at which the rate of photosynthesis is equual to the rate of cellular respiration, all oxygen and CO2 produced is used
how does carbon dioxide affect photosynthesis
as carbon dioxide increases so does the rate of photosynthesis as long as there is enough RuBisCO to catalyse the reaction, as long as tthere is enough ATP and NADPH from the light dependent stage, carbon dioxide also raises the light saturation point as more ATP and NADPH is being used
how do higher temps affect photosynthesis
more kinetic energy, causing more collisions between enzymes and substrates leading to more products being formed, above the optimum temp RuBisCO has a higher affinity for O2 so rate of reaction decreases, if too high temps, enzymes become denatured
low temperature affect on photosynthesis
decreased rate of reaction as less kinetic energy, inreasing light temp doesn’t havemuchh affect as it does when increasing at higher temps