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18 Cards in this Set
- Front
- Back
How are leaves adapted for photosynthesis? |
Large SA that collects lots of sunlight |
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6CO₂ + 6H₂O --light--> |
C₆H₁₂O₆ + 6O₂ |
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What are the three main stages to photosynthesis? |
Capturing of light energy |
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What happens in the LDR? What are the products? |
Light energy is converted into chemical energy. An electron flow is created by the effect of light on chlorophyll and this causes photolysis of water into protons, electrons and oxygen |
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What happens in the LIR? What are the products? |
Protons from LDR are used to reduce carbon dioxide to produce sugars and other organic molecules |
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Where does the LDR take place? |
Membranes of the thylakoids |
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Where does the LIR take place? |
In the fluid-filled matrix |
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What is oxidation? |
Loss of electrons or hydrogen, gain of oxygen |
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Photolysis of water: |
4H⁺ + 4e⁻ + O₂ |
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How are chloroplasts structurally adapted to their function of capturing sunlight? |
The thylakoid membranes provide a large SA (e.g. for attachment of chlorophyll |
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Where is the site of the LIR? |
The stroma of the chloroplasts |
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How is the chloroplast adapted to carryingout the LIR? |
Fluid filled stroma contains all the enzymes needed to carry out the LIR |
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What is a limiting factor? |
At any given moment, the rate of a physiological process is limited by the factor that is at its least favourable value |
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What are the two common ways of measuring the rate of PS in a plant? |
The volume of oxygen released by a plant |
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When light is the limiting factor, the rate of PS is ________ ____________ to _____ _________ |
directly proportional, light intensity |
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What is the compensation point? |
When there is no net exchange of gases by the plant |
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Between 0 and 25*C the rate of photosynthesis is approximately doubled for each __*C rise in termperature |
10 |
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Purely photochemical reactions are not usually affected by temperature.... |
This told researchers that there was also a totally chemical process involved as well as a photochemical one |