Chapter 10 Photosynthesis Flashcards
(28 cards)
autotroph vs. heterotrophs
auto- make their own food
hetero- consumers organic molecules
explain how Photosynthesis is different from cellular respiration
In what way do ecosystems depend on photosynthesis.
O2, food
What is the overall reaction that summarizes the process of photosynthesis?
C02+Light+H2O –> C6H12O6+O2
How does it compare with the overall reaction summarizing cellular respiration?
they’re opposite reactions and products
What is light?
solar energy
What property of light do we perceive when we see different colors?
wavelength
How is energy related to wavelength?
the smaller the wavelength the more energy
What are pigments?
give colors we can see
What are photo-sensitive pigments?
absorb light
What molecules act as pigments in the light-dependent reactions of photosynthesis
chlorophyll
Where does the light-dependent reaction (the “photo” reaction) of photosynthesis occur?
thylakoid membranes of chloroplast
Describe what happens when the photosystem pigments absorb light energy.
they get excited, creating energy and release an electron to an electronic acccpetor
At what point does the light energy absorbed produce a chemical change?
when H2O get split to release O2 and an e- that goes back into the chlorophyll
Explain how photosystem II differs from photosystem I.
photosynthesis ll is the water splitting system while photosystem l NAD+ to NADPH
How are the two photosystems interconnected?
they’re interconnect through the ETC through a series of redox reactions
What replaces the electrons lost by the reaction center chlorophylls in each of
the two photosystems?
PSl; H2O
PSll: the electrons passing along the ETC
What are the products of the light-dependent reactions?
ATP (energy) and NADPH (reducing power for Calvin cycle), O2
What molecule picks up the electrons from the light reactions, and where are the lost electrons taken?
NAD+ which turns to NADPH lost electrons are taken to the calvin cycle
Where does the Calvin Cycle (the “synthesis” reaction) occur?
Stroma
What does the Calvin Cycle create?
G3P and glucose
Describe the process.
What is Rubisco, and what does it do?
carbon fixation
Compare C3, C4, and CAM plants.
