Autotroph / Producer
Organisms which are able to make their own
energy and food.
Chlorophyll – protein rich pigment found in
Chloroplasts of plants
Chlorophyll A and B absorb reds and blues of
of sunlight and reflect green.
Other Pigments: Carotenoids / Anthocyanins /
Photo = Light
Synthesis = to make / produce / put together
6 water molecules + 6 carbon dioxide
molecules using the energy from the sun
make 1 glucose molecule + 6 oxygen
6 H2 O + 6 C O2 > C 6 H 12 O 6 + 6 O2
Light Dependent Reactions / Take place in the
Sunlight activates electrons in the thylakoid
membranes of the chloroplast
The activated electrons have enough energy to split
one molecule of water (H2O). The oxygen is
released into the atmosphere.
The hydrogen is trapped by a substance called
NADP and makes NADPH2.
There is enough energy to bond a phosphate to
adenosine diphosphate to make ATP.
Light Independent Reactions / Calvin Cycle
Take place in the Stroma of the Chloroplasts
Carbon dioxide is split using the energy from ATP
formed in the Light dependent reactions.
The Carbon attaches to a 5 carbon sugar (RuDP)
which makes an unstable 6 Carbon sugar and
immediately splits into two 3 Carbon compounds
The hydrogen being held by NADP~H attaches to
PGA and makes PGAL (C3H6O3)
Two PGAL bond and form one glucose
molecule. The remainder of the PGA return to
make more RuDP (5 carbon compound).
The reactions must occur 6 times in order for
one molecule of glucose to be formed.