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Photosynthesis | Definitions
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Photosynthesis | Definitions
Photosynthesis
Photosynthesis is the process by which green plants make their own food using light energy.
Chloroplast
The chloroplast is an organelle found in plant cells only. It has a double outer membrane and inside are disc-shaped membranes called grana. The green pigment chlorophyll is found here.
Chlorophyll
Chlorophyll molecules are pigments found in the grana of chloroplast which trap or absorb light energy.
Light Stage
The light stage is the first stage of photosynthesis. Light energy is essential for this stage to occur. The light stage takes place in the grana of the chloroplast as this is where the chlorophyll is located. When light energy is absorbed it is transferred to electrons within the chlorophyll. These electrons become energised. The energy from these energised electrons is used to generate ATP. The three products of the light stage are ATP, NADPH and oxygen.
Dark Stage
No light is required for the dark stage. It is the second stage of photosynthesis. Carbon dioxide combines with electrons and protons to form glucose in this stage. The electrons and protons are supplied by the NADPH produced during the light stage. The energy for the dark stage comes from ATP which is also made during the light stage of photosynthesis.
Photolysis of Water
The splitting of water in the presence of light to form oxygen, protons and electrons.
ATP
Adenosine triphosphate has a special role in trapping and transferring energy in chemical processes for cell activities.
NADP+
Nicotinamide adenine dinucleotide phosphate is a low-energy molecule used during photosynthesis. Its role is to trap and transfer electrons and protons to locations where they are needed.
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Photosynthesis
Photosynthesis is the process by which green plants make their own food using light energy.
Chloroplast
The chloroplast is an organelle found in plant cells only. It has a double outer membrane and inside are disc-shaped membranes called grana. The green pigment chlorophyll is found here.
Chlorophyll
Chlorophyll molecules are pigments found in the grana of chloroplast which trap or absorb light energy.
Light Stage
The light stage is the first stage of photosynthesis. Light energy is essential for this stage to occur. The light stage takes place in the grana of the chloroplast as this is where the chlorophyll is located. When light energy is absorbed it is transferred to electrons within the chlorophyll. These electrons become energised. The energy from these energised electrons is used to generate ATP. The three products of the light stage are ATP, NADPH and oxygen.
Dark Stage
No light is required for the dark stage. It is the second stage of photosynthesis. Carbon dioxide combines with electrons and protons to form glucose in this stage. The electrons and protons are supplied by the NADPH produced during the light stage. The energy for the dark stage comes from ATP which is also made during the light stage of photosynthesis.
Photolysis of Water
The splitting of water in the presence of light to form oxygen, protons and electrons.
ATP
Adenosine triphosphate has a special role in trapping and transferring energy in chemical processes for cell activities.
NADP+
Nicotinamide adenine dinucleotide phosphate is a low-energy molecule used during photosynthesis. Its role is to trap and transfer electrons and protons to locations where they are needed.