photosynthesis Flashcards
structure of a leaf adaptations
large sa for absorb max sunlight
thin short diffusion distance
stomata to allow gas exchange
many air spaces between spongy mesophyll
long block upper mesophll to absorb max sunlight
transparent waxy cuticle to stop evapouration
stages of photosynthesis
capture light, LDR in thylakoid, LIDR in stroma
what does the ldr and lidr make
ldr makes nadph atp o2
lidr makes glucose
ldr
chorphyll absorbs light energy. electrons get excited and boosted to higher energy level and acceped by electron carrier. chlorphyll becomes photoionised and oxidisedand carrier reduces. etc formed as they gop down release energy which is used to do adp plus pi to atp
chemiosmotic theory
each thylakoid is an enclosed chamber where h+ are pumped from stroma to thylakoid using proton pump and energy from photoylysis. therefore high conc of protons in thylakoid low in stroma. h+ are co enzymes and cross membrane through atp synthase channels called stalked granuels. as they go they catalyse reaction of adp plus pi to atp
photolysis equation
2h20->4h+ +4e- +02
what happens in photolysis
chlorphyll that was oxidised must gain electrons so gains from here.the h+ ions go through atp sythase pump and make nadph. oxygen used in respiration or biproduct
adaptations for ldr
thylakoid memberane large sa for attatchement of chlorphyl and ezymes
granal membranes with atp synthase channels
lidr calvin cyle where and what does it use
in the stroma. uses atp and nadph
what happens in calvin cyle
0-co2 diffuses fro m atmopshere to stroma
1- co2 from atmopshere combine with 5c rubp , catalysed by rubisco,to form 2 3c gp.
2-this then gets reduced using nadph to 2 3ctp using energy from atp.
3-nadp after lost its h goes back to thylakoid
4- 1 bit of tp used to make glucose thereofre cycle happens 6 times for one molecule to be made
5-rest of tp used to regenerate rubp
