photosynthesis Flashcards
name the plant organelle that fixed co2 from the atmosphere
chloroplast
describe how starch is formed from the products of the light- independent reactions of photosynthesis
two GALP used to produce a glucose moelcule
glucose molecules joined together by glycosidic bonds to form starch by condensation reactions
produces amylose and amylopectin
describe the light dependent reactions of photosynthesis
light energy used to excite electrons in chlorophyll
photolysis used to produce oxygen, electrons and hydrogen ions
electrons used in electron transport chain to replace those lost by chlorophyll
ATP is generated by photophosphorylation
NADP is reduced
role of photosynthesis in the carbon cycle
co2 is reduced to form organic molecules
devise an investigation to find the effectiveness of herbicides on light dependent reactions of photosynthesis
control temperature
test tube using all 4 herbicides
use DCPIP to measure light dependent reactions
isolate chloroplasts
one tube in the dark as control
time taken to decolourise DCPIP as measure of efficiency
longer to decolourise= more effective herbicide
explain why increase in co2 concentration affects growth of plants in glasshouses
co2 is limiting factor
co2 fixed to produce GP/GALP
increased co2 = more carbohydrates being produced
= greater rate of cell division
where do LDR take place in chloroplast
thylakoids
products of LDR
reduced NADP, ATP, and oxygen
source of hydrogen produced by LDR
water
location of chlorophyll in a choroplast
thylakoid membrane/ granum
where do LIR take place
stroma
name of enzyme used to fix co2
RUBISCO
immediate product of LIR
GP
location of calvin cycle
stroma of the chloroplast
describe roles of products of calvin cycle
ATP and reduced NADP
ATP used by enzyme converting GP to GALP to RuBP
reduced NADP used to convert GP to GALP
explain the importance of RUBISCO to productivity of an ecosystem
fixes inorganic carbon
allows formation of organic molecules by calvin cycle
these organic molecules allow transfer of energy to next trophic level
explain relationship between structure and function of a granum in photosynthesis
granum is formed from many layers of thylakoid membranes to increase surface area
thylakoid membranes contain chlorophyll to absorb light
electron carrier molecules thylakoid membrane involved in ATP production
