photosynthesis Flashcards

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1
Q

describe the LDR

A

photo ionisation
-chlorophyll absorbs light
-excites electrons to a higher energy level
-electrons lost from chlorophyll
-electrons pass down electron transfer chain by redox reactions

photophosphorylation
-energy released is used to pump protons (H+) across thylakoid membrane, into thylakoid space forming proton electrochemical gradient
-protons diffuse down electrochemical gradient through ATP synthase, catalysing ADP + Pi -> ATP

photolysis
-light splits 2H20 -> 4H+ + 4e- +O2
-e- replace electrons lost in chlorophyll
-H+ and NADP act as an electron acceptor for electron at end of ETTC forming NADPH (reduced NADP)

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2
Q

describe the LIR

A

carbon fixation
-rubisco catalyses CO2 combining with RUBP

reduction
-splits into 2x GP
-GP is reduced using NADPH TO triose phosphate (uses energy from ATP)

triose phosphate can be converted into organic substances

regeneration
-most triose phosphate converted into RUBP

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3
Q

where does the ldr occur

A

granum

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4
Q

where does the lir occur

A

stroma

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5
Q

what are the limiting factors of photosynthesis

A

temperature
carbon dioxide concentration
light intensity

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6
Q

the highest rate of photosynthesis is when all factors are at

A

the optimum level

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7
Q

how may commercial farming control limiting factors

A

artificial light to increase light intensity
blinds if light intensity is too high

co2 levels increased by burning fossil fuels

heaters can raise temp

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8
Q

describe the effect of introducing a herbicide on the electron transport chain

A

reduced transfer of protons across thylakoid membrane
so less atp produced
so less reduced nadp produced
so light independent reaction is stopped/slowed

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9
Q

in plants, atp is produced in the light dependant reaction
suggest why this is not a plants only source of atp

A

plants dont photosynthesise in the dark
not all the parts of the plant photosynthesise ( roots)
plants require more atp then is produced in the light dependant reaction
atp used in active transport

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