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Summary Photosynthesis IB Biology HL
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11 2 9 . .Photosynthesis 11
The use of energy consumed in photosynthesis is
called photolysis.
The light energy is converted to chemical energy
.
Light dependent reactions use light energy
to produce ATP and to split water (photolysis) ma-
king mo ions.
Light independent reactions use ATP and Htions
to "fix" CO2 making glucose
,
Electromagnetic spectrum
High frequency= high energy => UV, X-rays , trays
are harmful because they encourage cell and
DNA damage
Low frequency low energy =
, the pigments in photosynthetic organisms
cchlorophylls absorb useful wavelength that
contain energy appropriate for photolysis
t
Action spectrum shows the
rate ofphotosynthesis for all
wavelength of light as a %
of maximum possible rate
Absorption Spectrum shows the absorbance of
light by photosynthetic pigments for all the
wavelengths of light
Accessory pigments allow some plants to take
advantage of the green wavelengths of light in
low-light conditions such as underwater
,
, Why do leaves turn brown in autumn ?
·
Some leaves have accessory pigments which
cannot be seen when chlorophyll is active
-
When thetemperature is low, chlorophyll breaks down
before the accessory pigments leaving,
them to show
through
Factors affecting rate of photosynthesis
rate of X
photosynthesis further increase of light intensity
has no effect on rate of photosyn-
Ce g production . .
thesis
-
of 8a)
When light intensivity increase
the rate of photosynthesis increase
7
nighttime light intensivity
(lyx]
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