Optimum conditions for Photosynthesis

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  • Created by: Holly
  • Created on: 29-04-14 12:17
What are the 3 optimum conditions for photosyntheis?
Light intensity, Co2 levels, Temperature
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Why is light intensity an optimum condition?
HIgh LI means more energy absorbed
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What are the 3 pigments in photosystems?
Chlorphyll a, Chlorophyll b, Carotene
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What wavelength (colour) do these pigments absorb?
a - red, b - blue, Carotene - green
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What light (colour) do they reflect?
a & b - green, Carotene - red
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What is the opimum temperature required?
25 degrees
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Why is temperature an optimum condition?
Due to enzymes and level of activity
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What happens to enzymes when temp is too low?
Below 10 degrees - INACTIVE
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What happens to enzymes when temp is too high?
Above 45 degrees - DENATURED
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What happens to the stomata?
Stomata closes to avoid losing water, less Co2 can enter leaf
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What is the optimum Co2 concentration?
0.4%
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What is the normal Co2 concentration of the atmosphere?
0.04%
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Why is Co2 an optimum condition?
Required for calvin cycle. At optimum then enough Co2 can enter so the Calvin cycle can take place.
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What happens if the Co2 concentration rises above optimum?
The stomata close to prevent more from entering
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What is a limiting factor?
A factor that prevents photosynthesis from working at its fastest rate
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How is low Light intensity a limiting factor?
Light dependent stage can't make its products required for Calvin cycle
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What are these products?
ATP and reduced NADP
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What happens if they aren't available?
Conversion of TP to GP and GP to RUBP is slow
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What will happen to the level of RuBP, GP and TP?
RuBP - fall GP- rise TP - fall
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How is Co2 a limiting factor?
No Co2 entering the leaf means none to combine with RuBP to create GP
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What happens to the conversion rate?
Slows down
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What will happen to the levels of RuBP, GP and TP
RuBP - rise, GP & TP - fall
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How is temperature a limiting factor?
All reactions catalysed by enzymes
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What happens in low temperatures?
Enzymes are inactive so reactions will be slower
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What happens in higher temperatures?
Enzymes become dentaured so don't function
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What happens to the levels of RuBP, GP and TP?
All fall
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Other cards in this set

Card 2

Front

Why is light intensity an optimum condition?

Back

HIgh LI means more energy absorbed

Card 3

Front

What are the 3 pigments in photosystems?

Back

Preview of the front of card 3

Card 4

Front

What wavelength (colour) do these pigments absorb?

Back

Preview of the front of card 4

Card 5

Front

What light (colour) do they reflect?

Back

Preview of the front of card 5
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