Photosynthesis Flashcards
where does photosynthesis take place
chloroplasts
what adapatations does a leaf have to make it more efficient for photosynthesis
- large surface area that absorbs as much sunlight as possible
- stomata which opens and closes depending on light intensity
- many air spaces to allow rapid diffusion
- transparent cuticle to to let light through
where does the light dependant reaction occur
thylakoids
where does the light independant reaction occur
the stroma
what is the purpose of the light dependant reaction
- add an inorganic phosphate to ADP making it ATP
- to split water into H+ ions and OH- ions
what is the process of photoionisation
- when chlorophyll absorbs light energy (photon of light) - it excites a pair of electrons causing them to leave the chlorophyll
- the chlorophyll is now ionised
what happens to the excited electrons after leaving the chlorophyll
they are taken up by electron carriers
what is photolysis
the splitting of water into H+ and OH- ions using light
where is the ETC located
membranes of the thylakoids
what are the products of the light dependant reaction
ATP
NADPH (reduced NADP)
what are the products of the light independant reaction
glucose
which light reaction comes first
the light dependant reaction
what will happen if the light dependant reaction stops
then the light independant reaction will also stop as it needs the products from the LDR
what happens to the oxygen which is the by product of photolysis
- used in respiration
- diffuses out the leaves
what is a group of thylakoids called structually
grana
