Summary
Electrons flow from photosystem II to photosystem I through carriers, pumping protons for ATP synthesis.
In depth
Light energy excites P680 in PSII; the electron passes via plastoquinone, the cytochrome b6f complex and plastocyanin to PSI (P700), is excited again and goes to ferredoxin and NADP+ reductase. The energy diagram is zigzag-shaped.
The names P680 and P700 refer to wavelengths of maximum absorption. Photosystem II oxidises water using a manganese cluster. The proton gradient is built across the thylakoid membrane.
Example: herbicides such as DCMU block electron flow beyond PSII.
Frequently asked questions
What is Z-Scheme of Electron Transport?
Electrons flow from photosystem II to photosystem I through carriers, pumping protons for ATP synthesis.
Which area of biology covers Z-Scheme of Electron Transport, and how advanced is it?
Z-Scheme of Electron Transport is one of the 56 topics in Plant Biology. It is rated Advanced, so it suits learners who want specialist depth. Related topics in this area include Light-Dependent Reactions, Cyclic Photophosphorylation, Chlorophyll.
Can you give an example of Z-Scheme of Electron Transport?
Non-cyclic flow gives ATP, NADPH and O2.
What should I learn before Z-Scheme of Electron Transport?
Work through the Beginner topics in Plant Biology first, such as Plant Kingdom, Photosynthesis, Chlorophyll, then return to Z-Scheme of Electron Transport. Advanced topics assume the Intermediate vocabulary.
What topics are related to Z-Scheme of Electron Transport?
The closest topics to Z-Scheme of Electron Transport are Light-Dependent Reactions, Cyclic Photophosphorylation, Chlorophyll, Photosynthetic Pigments. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Z-Scheme of Electron Transport?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Z-Scheme of Electron Transport. To practise the whole of Plant Biology, use the Plant Biology quiz.
How is Z-Scheme of Electron Transport different from Light-Dependent Reactions?
Z-Scheme of Electron Transport: Electrons flow from photosystem II to photosystem I through carriers, pumping protons for ATP synthesis. Light-Dependent Reactions: In the thylakoid membranes, light splits water, releasing oxygen and making ATP and NADPH. Read both side by side and note what each one explains.
How should I study Z-Scheme of Electron Transport step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Light-Dependent Reactions and explain the difference aloud. Finally, take the Plant Biology quiz and come back to this page for any question you miss.