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Energy
Module 3: Photosynthesis
Introduction
Photosynthesis is a process where energy and CO2 is converted in to O2. Thought to be a process
first occurring in some prokaryotes. And can sometimes refer to as the most important biochemical
process since nearly all life on earth depends on it. The chemical potential energy that is produced is
used by consumers and decomposers.
Autotrophs and heterotrophs
The first life form on earth where chemoautotrophs, prokaryotes that synthesised complex organic
molecules, using energy from chemical reactions.…read more

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Proteins
embedded in the grana hold the photosynthetic pigment in place. Stroma contains enzymes which
are needed to catalyse reactions. Chloroplasts contain genetic material in the cytoplasm's DNA which
are used to make some proteins they need for photosynthesis.
Photosynthetic pigments are substances that absorb certain wavelengths of light. Different pigments
are arranged in a funnel shape and act together by either absorb light or reflect the light.…read more

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Cyclic photophosphorylation…read more

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This only uses photosystem 1 (P ) exited electrons
700…read more

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Small amount
of ATP are made. This may be used in the light independent reaction or the guard cells.
Non-cyclic photophosphorylation
Involves PS1 and PS2
1. Light hits PS2 and excites a pair of electrons that leave the chlorophyll molecule from the
primary pigment reaction centre.
2. The electrons pass along a chain of electron carriers, there energy is released and used in the
making of ATP
3. Light has also struck PS1 and a pair of electrons have been lost there too.
4.…read more

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Temperature…read more

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