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Dylan Essex Block 2 Photosynthesis (Productivity (There are two aspects to…
Dylan Essex Block 2 Photosynthesis
Function
Photosynthesis
photosynthesis reaction
Light-dependent reaction
Provide high energy electrons (e-) that the Calvin cycle needs to make the covalent bonds that hold atoms in of glucose molecules together
Provide the energy needed to produce ATP that powers the endergonic processes of the Calvin cycle.
Energy is needed for e- transport
Energy is needed to make ATP
All the energy comes from light
The coenzyme NADPH transports 2 e- each
NADP+ is empty of 2 e-
NADPH is filled with 2 e-
Location: Thylakoid membrane.
Reaction: H2O + NADP+ + ADP → O2 + ATP + NADPH (requires light)
Reactant: water (H2O), unfilled NADP+ coenzyme, ADP, and P
Products: oxygen (O2), filled NADPH coenzyme, ATP
Calvin cycle
Calvin cycle
Location: stroma,
Reaction: CO2 + ATP + NADPH → C6H12O6 + NADP+ + ADP + P
Reactants: ATP, NADPH, imported carbon dioxide (CO2)
Products: glucose (C6H12O6), NADP+, ADP, P
Light reactions and calvin cycle are coupled
Building blocks
Chloroplasts
structure
Photosynthetic organelles of plants
Three membranes, outer, inner, and thylakoid membrane
Stroma is "cytoplasm" of thylakoid
Stacks of thylakoids called granums, connect via stromal lamellae
contain ribosomes and nucleoid ring
Proton gradient
Electron transport chain
Photosystems and light absorbsion
Photosystems allow organism to harness free energy and pass it to electron transport chain
Leaves can change color based on the plants needs
Light is absorbed better depending on where it falls on the spectrum
Productivity
There are two aspects to primary productivity:
Gross primary productivity (GPP)
Net primary productivity (NPP)
GPP is an account of the total amount of glucose made
NPP is the remainder of GPP after respiration has consumed some of the glucose (NPP = GPP - respiration)
