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Photosynthesis Terms
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25
Biology
9th Grade
12/02/2010

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Term
Autotrophs
Definition
living things that are able to make their own food without using organic molecules derived from any other living thing.
Term
photoautotrophs
Definition
Autotrophs that use the energy of light to produce organic molecules.Most plants, algae and other protists, and some prokaryotes are photoautotrophs.
Term
Chloroplasts
Definition
organelles consisting of photosynthetic pigments, enzymes, and other molecules grouped together in membranes
Term
Chlorophyll
Definition
an important light absorbing pigment in chloroplasts, is responsible for the green color of plants
Chlorophyll plays a central role in converting solar energy to chemical energy
Term
mesophyll
Definition
the green tissue in the interior of the leaf
Term
Stomata
Definition
tiny pores in the leaf that allow carbon dioxide to enter and oxygen to exit
Term
stroma
Definition
the dense fluid within the chloroplast
Term
thylakoids
Definition
A system of interconnected membranous sacs that segregates the stroma from another compartment, the thylakoid space
Term
grana
Definition
Thylakoids are concentrated in stacks
Term
light reactions
Definition
light energy is converted in the thylakoid membranes to chemical energy and O2
Water is split to provide the O2 as well as electrons
Term
Calvin cycle
Definition
It is a cyclic series of reactions that builds sugar molecules from CO2 and the products of the light reactions
Term
carbon fixation
Definition
During the Calvin cycle, CO2 is incorporated into organic compounds
Term
electromagnetic spectrum
Definition
the full range of electromagnetic wavelengths
Term
wavelength
Definition
the distance between the crests of two adjacent waves
Term
photon
Definition
a fixed quantity of light energy, and the shorter the wavelength, the greater the energy
Term
Chlorophyll a
Definition
absorbs blue violet and red light and reflects green
Term
Chlorophyll b
Definition
absorbs blue and orange and reflects yellow-green
Term
carotenoids
Definition
absorb mainly blue-green light and reflect yellow and orange
Term
Photosystems
Definition
light-harvesting complexes surrounding a reaction center complex
Term
Photosystem II
Definition
which functions first, is called P680 because its pigment absorbs light with a wavelength of 680 nm
Term
Photosystem I
Definition
which functions next, is called P700 because it absorbs light with a wavelength of 700 nm
Term
photophosphorylation
Definition
the chemiosmotic production of ATP in photosynthesis
Term
photorespiration
Definition
Rubisco adds oxygen instead of carbon dioxide to RuBP and produces a two-carbon compound Unlike photosynthesis, photorespiration produces no sugar, and unlike respiration, it produces no ATP
Term
greenhouse effect
Definition
Gases in the atmosphere (often called greenhouse gases), including CO2, reflect heat back to Earth, keeping the planet warm and supporting life However, as we increase the level of greenhouse gases, Earth’s temperature rises above normal, initiating problems
Term
global warming
Definition
The extraordinary rise in CO2 is mostly due to the combustion of carbon-based fossil fuels
The consequences of continued rise will be melting of polar ice, changing weather patterns, and spread of tropical disease
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