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IB biology photosynthesis notes
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It covers topic 2.9 and 8.3 in IBDP higher level Biology.
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PHOTOSYNTHESIS Arathi Anand
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, Sunlight → high energy molecule
6 CO2 t G H z O → C G H iz Og t 602 (needs
ATP)
Photosynthesis is the production of carbon compounds in cells using
light
PRODUCTION OF CARBON COMPOUNDS energy .
0
Living organisms require complex carbon compounds to carry out life
processes and build the structures in their cells .
°
Photosynthesis involves the conversion of light energy into chemical energy
( carbohydrates , lipids, protein and nucleic acids ) .
°
Chloroplasts light energy from the sun and convert this energy
absorb into
chemical used by the organisms for
energy (glucose ) to be energy .
LIGHT FREQUENCY
°
Light from the sun is composed of a range of wavelengths .
0 The visible spectrum is the portion of the electromagnetic spectrum that
is visible to or can be detected
by the human eye .
Electromagnetic radiation
o in this range of wavelengths (400 to 700 nm )
is called visible light .
° All these wavelengths together form while light with violet 1 blue colors
,
having shorter
wavelength (more energy) and red colours having
longer wavelengths (less energy) .
° The two main colours of light that are absorbed by chlorophyll are
blue and red light .
is
° The main colour is reflected is
green light ,
which why most leaves look
green .
ACTION SPECTRUM
°
electromagnetic spectrum con sits of the entire range of
The
electromagnetic radiation .
° The
part of the spectrum that is involved in photosynthesis is called
the visible light spectrum .
°
An action spectrum is the rate of
a
photo synthesis plotted against
wavelength of light in chloroplasts at each different wavelengths .
0 The highest rates of
photosynthesis occur at red and blue wavelengths
o The
absorption spectrum shows the yo of light absorbed by the photosynthetic
in chloroplasts at each different
pigments wavelength .
°
The graphs are very photosynthesis occurs when light
similar because
is absorbed by the chlorophyll pigments ; therefore the wavelengths
rates of absorption will also have of
that have greatest high rates
photosynthesis .
o
wavelength of light is reflected
Green and therefore has a very
low yo
absorption level on the absorption spectra ( this is why most
leaves are green ) .
o
peak approximately a't 450hm
o peak approximately at 670hm
°
First peak is higher than the second peak
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