Photosynthesis Flashcards
(15 cards)
Where are photosynthetic pigments li acted in the chloroplast?
The grana
Where do light dependent reactions occur ?
Grana
Where do light independent reactions occur?
The stroma
How leaves are adapted for photosynthesis?
Large SA
Thin
Stomatal pores
Space is spongey mesophyll
Space between palisade cells
How are cells adapted for photosynthesis?
Cuticle and epidermis are transparent
Palisade have large vacuole (no shade)
Cylindrical to cover more space
How are chloroplast adapted for better photosynthesis?
-Large SA
-Move towards top of cell for max light absorption
-pigments in single layer
-More in palisade cells
Why are there different photosynthetic pigments?
To allow different wavelengths of light to be absorbed
Chlorophyll a peak wavelengths absorbed?
-435
-670-680
-yellow/green
Chlorophyll b peak wavelength absorbed?
-480
-650
-blue/green
Carotene peak wavelength absorbed?
-425-480
-orange
Describe the structure of a photo system?
-antenna complex:
-contains pigments that all a range of light at a range of wavelengths to be absorbed
-reaction centre
- contains chlorophyll a which ,when excited by photons, emit electrons.
What is photo system 1 peak absorption?
P700
What is photo system 2 peak absorption?
P680
What are the products if the light dependent reaction?
-ATP
-reduced NADP
-oxygen
Describe cyclic photo phosphorylation?
-PS1 absorbs photons, excited electron
-picked up by electron acceptor
-passed down chain of electrons back to PS1
-energy released phosphorylase’s ATP
