Lesson 3&4- Photosynthetic Pigments and Light Dependent Reaction

8/19/2019 Lesson 3&4- Photosynthetic Pigments and Light Dependent Reaction

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A Level Unit 1 Module 3:Photosynthesis

Photosynthetic pigments

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Photosynthetic pigments03/14/16

How are chloroplasts adapted for photosynthesis?

Why are leaves green?


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Learning o!ective"# $efine the term photosynthetic pigment

# %&plain the importance of photosynthetic

pigments in photosynthesis

03/14/16


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Light absorption by

chlorophylls

• All chlorophyll is associated with proteins to form light-harvesting complexes

in the thylakoid membrane

• There is no free chlorophyll


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Light is absorbed byindividual chlorophylls in

the light-harvestingcomplexes

Energy is transferred fromone pigment to another

This transfer funnels theenergy to a reaction centre

where electron transferstarts

Energy transfer in light-harvesting complexes


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Light harvesting comple&


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+omplete first 3 ,'estions on sheet

The light-dependent rea

Li ht d d t t


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Light dependent stage


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g#n

$lvent*&nt

#gment$ +an %e e/t&a+te- *&m *#nel +h''e- leave$ % gn-#ng thet#$$,e$ #n a+etne

When the '#gment e/t&a+t #$ $,%e+te- t a$+en-#ng 'a'e&+h&matg&a'h1 the '#gment$ +an %e anal$e- an- #-ent#*#e-

+a&tene

'hae'ht#n

/anth'hll

+hl&'hll a

+hl&'hll %

The 'n+#'al 'lant '#gment$

*,n- #n g&een 'lant$ a&e

the +hl&'hll$ (a an- %)

an- the +a&ten#-$ (+a&tenean- /anth'hll)

The &le * the$e '#gment$ #$

t +a't,&e l#ght ene&g an-

ea+h * the '#gment$ a%$&%

va,$ .avelength$ t

-#**e&ent e/tent$

ht$nthet#+ '#gment$


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When a %eam * l#ght #$ 'a$$e- th&,gh a gla$$ '$m1 the v#$#%le$'e+t&,m * .h#te l#ght #$ %ta#ne-

When a %eam * l#ght #$ *#&$t 'a$$e- th&,gh a $l,t#n * lea* e/t&a+t1 thenan a%$&'t#n $'e+t&,m #$ %ta#ne-

2la+3 %an-$ a''ea& #n the $'e+t&,m .he&e 'a&t#+,la& .avelength$ *l#ght have %een a%$&%e-

&e-m#nantl1 .avelength$ at the %l,e an- &e- en-$ * the$'e+t&,m have %een a%$&%e-

A2SORTION SECTRA


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a+t#n$'e+t&,m

a%$&'t#n$'e+t&,m

Alth,gh all .avelength$ %et.een 400 an- 700 nm a&e a%$&%e- % the 'lant e/t&a+t1

ma/#m,m a%$&'t#n ++,&$ #n the v#let%l,e an- &e- &eg#n$ * the $'e+t&,m

The&e #$ a +l$e +&&elat#n %et.een the a+t#n $'e+t&,m an- the a%$&'t#n $'e+t&,m

The &ate * 'ht$nthe$#$ #$ la&gel -ete&m#ne- % the am,nt * l#ght * -#**e&ent

.avelength$ %e#ng a%$&%e-

0

2 0

4 0

6 0

0

! 0 0

0

2 0

4 0

6 0

0

! 0 0

"

a

b

s

o

r #

t i o

n

r a

t e

o

f

#

h

o

t o

s

y

n

t h

e

s

i s

4 0 0 $ 0 0 6 0 0 % 0 0w a v e l e n g t h & n m

A2SORTION AN ACTION SECTRA


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Photosynthetic pigments'igment Photo-

system

+olo'r

asored

Wavelength

asored

Primary /

accessory+hlorophyll a

.P60

+hlorophyll a

.P00

+hlorophyll

+arotenoids


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Lesson 3&4- Photosynthetic Pigments and Light Dependent Reaction

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