Photosynthesis

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Light dependant reaction
Occurs on the thylakoid membrane. Produces NADPH and ATP. Uses water and oxygen is a waste product. Only occurs in the light. ATP = ADP + Pi. NADPH = NADP + e + H.
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Light independant reaction
Occurs in the stroma. Uses NADPH and ATP in a reduction reaction (loses e to GP). Uses CO2 and produces glucose. Doesn't require light but does require products of the LDR. Controlled by enzyme Rubisco. AKA the Calvin Cycle.
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Light intensity as a limiting factor
The rate of photosynthesis is directly proportional to light intensity - after a certain point the rate levels off as the photosynthetic pigments become saturated. High light intensities may damage plants and reduce their photosynthesizing ability.
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Redox reactions
Oxidation - loss of e/H ions. Reduction - gain of e/H ions.
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Light compensation point
The light intensity at which the rate of photosynthesis is balanced with the rate of respiration.Shade plants have a lower compensation point but cannot photosynthesize at high light intensities. Sun plants p/s best at high light intensities.
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CO2 as a limiting factor
Average atmospheric nitrgoen CO2 is roughly 0.04%. Plants rate of p/s can increase upto 0.5%. Above 0.1%, leaves can be damaged, their optimum is just under 0.1%.
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Spectra - absorption/action
Absorption - shows the wavelengths of light that are absorbed by pigments. Action - shows the wavelengths of light which stimulate photosynthesis.
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Temperature as a limiting factor
Has little effect on the light dependant reaction as it is driven by light but affects the light independant reaction as it is driven by enzymes. Rate of p/s will start to drop after a certain point as enzymes begin to denature.
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Commercial glasshouses - why are they beneficial?
Crops can be grown out of season. Better yeilds can be achieved. Crops can be grown out of area. Optimum temperatures can be obtained. Ventillators are used to replenish CO2 levels.
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Other cards in this set

Card 2

Front

Occurs in the stroma. Uses NADPH and ATP in a reduction reaction (loses e to GP). Uses CO2 and produces glucose. Doesn't require light but does require products of the LDR. Controlled by enzyme Rubisco. AKA the Calvin Cycle.

Back

Light independant reaction

Card 3

Front

The rate of photosynthesis is directly proportional to light intensity - after a certain point the rate levels off as the photosynthetic pigments become saturated. High light intensities may damage plants and reduce their photosynthesizing ability.

Back

Preview of the back of card 3

Card 4

Front

Oxidation - loss of e/H ions. Reduction - gain of e/H ions.

Back

Preview of the back of card 4

Card 5

Front

The light intensity at which the rate of photosynthesis is balanced with the rate of respiration.Shade plants have a lower compensation point but cannot photosynthesize at high light intensities. Sun plants p/s best at high light intensities.

Back

Preview of the back of card 5
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