C1.3 Photosynthesis Flashcards
What is photolysis?
using light energy to split water
What is the equation for producing glucose?
H2O + CO2 -> C6H12O6 + O2
What is the function of the pigments?
to absorb light
How pigments can be separted? What’s the name of the method?
chromatography
Which wavelengths does chlorophyll absorb?
- red (700 nm)
- blue (400 nm)
What is absorption spectrum?
shows the wavelengths of light that pigment absorbs
What are the limiting factors on the rate of photosynthesis?
- carbon dioxide concentration
- light intensity
- temperature
Where are pigments found?
photosystems in thylakoid membranes
Where is thylakoid found?
chloroplast
Where are photosystems found?
in thylakoid membranes, in the chloroplast
What is the function of reaction centre in photosystem?
- receive energy from light
- transfer electrons to electron transport chain
What light does to the pigment? What happens when the pigment absorbs light?
pigment is energised by light and releases high energy electrons
What is the main difference between Photosystem I and Photosystem II?
PSI: aborbs 700 nm wavelengths
PSII: absorbs 680 nm wavelengths
Where does the PSI get electron from?
electron lost from PSII
Where does the PSII get electron from?
from photolysis of water
What’s the advantage of multiple pigments?
- more photons can be absorbed
- increased range of wavelengths
- energy transfer to the reaction center
Where is chlorophyll a?
reaction center
What does the reaction center do?
receives photon and excites an electron
Why photosynthesis require water?
to use the water for photolysis and get electrons and hydrogen ions
What’s the byproduct of photolysis?
O2, oxygen
Where is the electron from PSII is further passed?
electron transport chain
What is the energy from the electron used for?
to power up the proton pumps
From where to where does the proton pumps pump the protons in photosynthesis?
from stroma (outside) to thylakoid space (inside)
What is a stroma?
liquid that fills the chloroplast
