Electromagnetic Spectrum Flashcards
Do plants absorb light across the same spectrum that human eyes detect?
Yes
Short wavelengths are more or less energetic?
More
Long wavelengths are more or less energetic?
Less
What does chlorophyll do?
Creates green pigment, allows skin tone pigment
What does b-carotene do?
Allows orange pigment
What does xanthrophyll do?
Allows yellow pigment
What does Anthrocyanins do
Allows blue and purple pigment
Where are pigments?
Embedded in the thylakoid membrane
What are pigment clusters called?
Photosystems
What is an action spectrum?
The efficiency of a pigment at absorbing light
Where are photosystems?
Embedded within the thylakoid membrane
What is a photosystems made of?
Chlorophyll molecules, accessory pigments, and proteins
What does a photosystems do?
Releases and transfers excited electrons to ETC
How many photosystems are there?
2
What is photosystems 1?
The first to evolve
Also called p700 as it effectively absorbs wavelengths of 700m
What is photosystem 2v
Evolved later
Also called p680 as it effectively absorbs wavelengths of 680m
How does a plant produce sugar?
Using both photosystems
How many p700 compared to p680?
Equal amount
How do photosytems harvest energy from light?
Light energy is passed from antenna chlorophyll to the next in a random order until it reaches reaction center
Reaction center ejects electron into another electron acceptor
Electron enters ETC of thylakoid
