3.5 Continued: Photosynthesis Intro Flashcards
What is the simplified photosynthesis formula?
6CO2 + 6H2O + light energy —> C6H12O6 (hexose) + 6O2
What are the reactants of ohotosynthesis?
- 6 CO2 and 12 H2O
Why is the simplified formula of photosynthesis 6 H2O as reactants, but 12 H2O alone?
- The doubling of H2O input allows for production of diatomic oxygen gas AND excess protons being pumped into lumen via cytochromes for increased H+ gradient
- (when u split H2O, u get one oxygen but oxygen is diatomic)
What are the products of photosynthesis?
- C6H12O6
- 6 H2O
- 6 O2
What do we track in photosynthesis using the non- simplified formula?
- atoms
Phtosynthesis splits __ into _ and _.
- H2O
- H
- O
What is a redox reaction?
- reaction involving complete or partial transfer of one or more electrons from one reactant to another
How do redox reactions work in photosynthesis?
- the electeons are transferred with H+ (from split H2O) to CO2, reducing it to sugar
What are the two stages to photosynthesis?
- light reaction
- calvin cycle
What type of energy is light?
- electromagnetic energy
Light makes up particles of energy called _____. Light travels in ___.
- photons
- waves
What is a wavelength?
- the distance from the crest of one wave to the crest of the next wave
What is the entire range of wavelengths called? What is the range for visible light?
- electromagnetic spectrum
- 380 nm to 750 nm is visible light
Which has more energy: short or long wavelengths?
- short wavelengths
When light reacts with matter, it can be? (3)
- reflected
- transmitted
- absorbed
____ are able to absorb visible light
Pigments
The color that we can see is the ____ wavelength. Give an example?
- reflected
- leaves r green because chlorophyll absorbs violet blue and red light, so it reflects green
What are 2 photosynthetic pigments?
- cholorophyll a
- chlorophyll b
What is chlorophyll a? (3)
- primary pigment
- involved in the light reactions
- blue/green pigment
What is chlorophyll b?
- accessory pigment
- yellow/green pigment
What are carotenoids? What colour is their pigment?
- broaden the spectrum of colours that drive photosynthesis
- yellow/orange pigment
What is photoprotection?
- carotenoids absorbs and dissipate excessive light energy that could damage chlorophyll or interact with oxygen