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A2 2 - Photosynthesis Summary

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Summarises the Photosynthesis topic for A2 Biology Unit 2. Good luck!

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September 5, 2025
Number of pages
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Written in
2021/2022
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Light
Photosynthesis * Darkness
+


Darkness
Gp grill form RUBP + CO2

GP → TP
* ATP + NADPH not available for



chlorophyll ☒ Rupp can't be regenerated
6102+611,0 sunlight
= 161-11106+602
* 9 101C GP + * cone Rupp


limit Rate 01ps
energy

light


Jiff &
* Rate measured by for uptake 01 Or production

0 * light intensity ,
( Or cont temp are main factors
u
upper wax curiae
At cuticular transpiration § As If factor is limiting , 9 it will prate or PS




y
epidermis



§É A M other non limiting factors will not affect rate
palisade mesopnull
-




* no chloroplasts
Aline to upper surface → trap
101
i. all light passes
most light A conc

"t
}
* Upright : less walls for light time
101 / temp
* tightly packed + many chloroplasts factor /no
mesophyll M conc ( Or


Spongy me soph 411

* less / Air spaces → I temnim
packed
I ti conc 0,




]
continuous link w/ stomata →




2
gas exchange
lower

epidermis
( Oz
gco
,;
wax curiae ,
mir
102 Guard cell WI 11in
chloroplasts 101 + tho ☒ NO CO2 to join to RUBP

light intensity
he RUBP not used up : .
RUBP conc . T

* intermediate compound light Intensity :
as not formed


( h / ON PIAST * at till rate 01 Psis it t Lt is limiting
* UP can't be produced ,




* GP conc . .lv * if limiting , not enough Atp + Nappy produced during LD stage ,



flattened thylakoid s
* internal system of :
large SA In amount of
.


.
.



limiting Llrxn +
.

carb production
10 , present coz removed
.
.




chlorophyll other pigments that absorb light energy e- carriers




"
+ e. g.
e. g. dark / getting dark : .
11 limiting / cloudy days
t
enzymes in PS

* stacks of thylakoid -
-



grata →
contain conc -
areas or light absorbing É Hi .




pigments ( light harvesting) * Atmospheric lvl :O -04% below optimal Infor PS
-




I WISH

É
→ . .




* thylakoid's linked together by intergranal lamellae 0.1010 = in rates


* ( Oz fixed into sugars 1- Other compounds in series of cyclical rxns $ If 1019 , more available for carbonation or RUBP inv , more GP

in stroma made t .
: move carbs

* Those rxns depend on prods from rxns on that aroids / absorption 01 * Sunny day =P LI t temp : .
Coilimibinol

light energy) * Greenhouse pipe in CO2 to 9 Pst growth rate
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