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38 terms

LC Biology 2.2b Photosynthesis

Biology Photosynthesis
STUDY
PLAY
Photosynthesis
Process by which green plants use sunlight to make foods from carbon dioxide and water.
Autotrophs
Organisms which make their own food
Photosynthesis equation
6CO2 + 6H20 --> C6H12O6 + 6O2
Reactants
Carbon dioxide and Water
Factors
Light and chlorophyll
Products
Glucose and oxygen
Leaf
Site in plant where most photosynthesis takes place
Palisade layer
Site in leaf where most photosynthesis takes place
Chloroplast
Site in cell where photosynthesis takes place
Chlorophyll
Pigment which absorbs light
Main events of photosynthesis
1. Light is absorbed. 2. Water is split into protons (H+), electrons and oxygen. 3 Light energises electrons. 4. Carbon dioxide is used to make Glucose
Light stage
1st stage of photosynthesis. Is dependent on light and is not controlled by enzymes
Green
Colour of light which is NOT absorbed
Products of splitting water
Protons (H+), electrons, and oxygen
Fate of electrons
Passed to electron transport chains in the chlorophyll
Fate of protons
Stored in a proton pool for future use
Oxygen
This gas is released to the atmosphere or used for cellular respiration
Adenosine Triphosphate
What ATP stands for
Adenosine Diphosphate
What ADP stands for
ATP
high energy molecule which carries energy
ADP
low energy molecule which binds with phosphate to form a high energy molecule
Cyclic electron pathway
The high energy electrons pass from chlorophyll to a series of electron acceptors and back to chlorophyll. Makes ATP
NADP+
low energy molecule which binds with 2 electrons and a proton (H+) to form a high energy molecule
NADPH
high energy molecule which transports protons and electrons
Non-Cyclic electron pathway
Two high energy electrons are passed from chlorophyll to electron acceptor but do not go back to the chlorophyll. Used to make more ATP and NADPH
ATP + NADPH + O2
End products of light stage
ATP
Molecule made in light stage which supplies energy for dark stage
NADPH
Molecule made in light stage which supplies protons and electrons for dark stage
Water
This small molecule provides the H for making glucose
Dark stage
2nd stage of photosynthesis. Is NOT dependent on light but is controlled by enzymes
Events in Dark stage
Carbon dioxide is taken in and combines with hydrogen ions. The carbon dioxide is reduced to glucose
Carbon dioxide
This small molecule provides the C for making glucose
Elodea
Plant used to measure the rate of photosynthesis
Light and Carbon dioxide concentration
Factors which effect the rate of photosynthesis
Number of bubbles per minute
How the rate of photosynthesis is measured
Distance of light bulb from plant
How light intensity is changed
Saturated Calcium carbonate solution
How Carbon dioxide concentration is kept the same
Water bath
How temperature is kept the same