Photos ynthes is (1)
What would
you call this
Flower?
H o w d o o r g a n is m s o b ta in e n e r g y ?
• A u to tr o p h s – O r g a n is m s th a t u s e th e
e n e r g y fr o m s u n lig h t to m a k e e n e r g y in
w h ic h th e y c a n u s e . (u s e c h e m ic a l b o n d s
in in o r g a n ic c o m p o u n d s to m a k e o r g a n ic
com pounds)
• H e te r o tr o p h s – O r g a n is m s g e t e n e r g y
fr o m o th e r o r g a n is m s .
H e te r o tr o p h o r A u to tr o p h ?
W h a t a b o u t th is p la n t?
W h a t a b o u t th is p la n t?
*A u to tr o p h – It s till
c a r r ie s o u t th e p r o c e s s
o f p h o to s y n th e s is lik e
e v e r y o th e r p la n t.
P la n ts n e e d o th e r
n u tr ie n ts a ls o , lik e
n itr o g e n , p h o s p h o r o u s ,
a n d p o ta s s iu m .
In d ir e c t o r D ir e c t e n e r g y
• D ir e c t – A u to tr o p h s (E n e r g y is p r o d u c e d fr o m
th e s u n s e n e r g y )
• In d ir e c t – H e te r o tr o p h s (E n e r g y is g a in e d fr o m
th e c o n s u m p tio n o f a n o th e r o r g a n is m s )
P h o to s y n th e s is
• H o w A u to tr o p h s g e t th e ir e n e r g y d ir e c tly fr o m
th e s o u r c e .
• T h e s u n is th e u ltim a te s o u r c e o f A L L e n e r g y
o n th is p la n e t!
• S u m m a r y E q u a tio n o f P h o to s y n th e s is …
• 6 C O 2 + 6 H 2 O + s u n lig h t → C 6 H 1 2 O 6 + 6 O 2
(c a r b o n d io x id e ) (w a te r )
(g lu c o s e ) (o x y g e n )
A plant Needs s omething to abs orb
lig ht energ y !
• A C hloroplas t
Pig ments abs orb lig ht…
• What color does
each of thes e boxes
abs orb ?
- White Lig ht
contains all colors
P la n ts h a v e m a n y d iffe r e n t p ig m e n ts …
B u t w h y d o th e y o n ly a p p e a r g r e e n ?
P la n ts h a v e m a n y d iffe r e n t p ig m e n ts …
B u t w h y d o th e y o n ly a p p e a r g r e e n ?
C hloroplas t Pig ments
• C h lo r o p h y ll a (r e fle c t g r e e n ) – d ir e c tly in v o lv e d
in th e lig h t r e a c tio n (n e x t le c tu r e )
• A c c e s s o r y P ig m e n ts
– C h lo r o p h y ll b (r e fle c t g r e e n )
– C a r o te n o id s (r e fle c t y e llo w , o r a n g e , a n d r e d )
T h e s e P ig m e n ts h e lp th e c h lo r o p la s ts to c a p tu r e
m o r e o f th e e n e r g y in lig h t th a n w h a t c h lo r o p h y ll a
c o u ld d o o n it’s o w n .
Fall
C olors
Fall C olor C hang e
• Due to plants los s of chlorophyll in
the fall.
• The chlorophyll us ually mas ks the
other colors becaus e of it’s
abundance.
• The carotenoids take over as the
major pig ment g iving leaves the
yellow, orang e, red colors .