3.8 Photosynthesis Flashcards

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1
Q

Photosynthesis equation

A

Carbon dioxide + water → Glucose + oxygen + water

6CO2 + 12H2O → C6H12O + 6O2 + 6H2O

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2
Q

Factors that affect the rate of photosynthesis

A

Temperature, light intensity, CO2 concentration

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3
Q

How temperature affects the rate of photosynthesis

A
  • Rise in temperature increases the rate of photosynthesis: greater kinetic energy
  • Above certain temperature decreases the rate of photosynthesis: enzyme denatures
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4
Q

How light intensity affects the rate of photosynthesis

A

* Increase in light intensity increases the rate of photosynthesis up until a certain point * Chlorophyll saturated by light

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5
Q

How CO2 concentration affects the rate of photosynthesis

A
  • Increase in CO2 concentration increases the rate of photosynthesis up until a certain point
  • Enzyme responsible for carbon fixation become saturated
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6
Q

Ways to measure the rate of photosynthesis

A
  • Measure CO2 uptake - Change in pH of water (more alkaline)
  • Measure O2 production - bubbles produced
  • Measure biomass - glucose production seen by change in biomass
  • Starch - by iodine staining
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7
Q

Colours of visible spectrum

A

(700nm) Red Orange Yellow Green Blue Indigo Violet (400nm) Longer to shorter wavelength

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8
Q

Chlorophyll

A

* The main site of light absorption * When chlorophyll absorb light, it releases electrons which are used to produce ATP

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9
Q

Red, green and blue light in photosynthesis

A
  • Red and blue are absorbed by chlorophyll
  • Green is reflected - thus the colour of plants
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10
Q

Light dependent reaction

A
  • Light stimulates chlorophyll to produce electrons → produce ATP
  • Light also splits water molecules into hydrogen and oxygen → hydrogen taken up by a NADP+ to form NADPH
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