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Photosynthesis
photosynthesis
15
Biology
10th Grade
01/28/2010

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Term
Autotroph
Definition
an organism that produces its own nutrients from inorganic substances or from the environment instead of consuming other organisms.
Term
Chloroplast
Definition
an organelle found in plant and algae cells where photosynthesis occurs.
Term
Chlorophyll
Definition
a green pigment that is present in most plant cells, that gives plants their characteristic green color, and that reacts with sunlight, carbon dixiode, and water to form carbohydrates.
Term
Chemosynthesis
Definition
the production of carbohydrates through the use of engery from inorganic molecules instead of light.
Term
Carotenoid
Definition
a class of pigments that are present in the Thylakoid membrane of plants and that aid in photosynthesis.
Term
Electron Transport Chain
Definition
a series of molecules, found in the inner membranes of mitochondria and chloroplasts, through which electrons pass in a process that causes protons to build up on one side of the membrane.
Term
granum
Definition
a stack of thylakoids in a choroplast
Term
Heterotroph
Definition
an organism that obtains organic food molecules by eating other organisms or their byproducts and that cannot synthesize organic compounds from inorganic materials.
Term
light reactions
Definition
the initial reactions in photosynthesis, which are triggered by the absorption of light by photosystems I and II and include the passage of electrons along the electron transport chains, the production of NADPH and oxygen gas, and the synthesis of ATP through chemiosmosis.
Term
Pigment
Definition
a substance that gives another substance or a mixture its color.
Term
Photosynthesis
Definition
the process by which plants, algae, and some bacteria use sunlight, carbon dixiode, and water to produce carbohydrates and oxygen.
Term
Photosystem
Definition
in the thylakoid membranes of chloroplasts, a cluster of chlorophyll and other pigment molecules that harvest light energy for the light reactions of photosynthesis.
Term
Primary Electron Acceptor
Definition
In chloroplasts, an acceptor of electrons lost from chlorophyll a; found in the thylakoid membrane.
Term
Stroma
Definition
in plants, the solution that surrounds the thylakoids in a chloroplast.
Term
Thylakoid
Definition
a membrane system found within chloroplast that contain the components for photosynthesis.
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