Question

What happens to the electrons from water that was split into O2 and H+?

What does the water-splitting photosystem produce for the Calvin Cycle?

What does the NADPH producing photosystem produce for the Calvin Cycle?

How do the two electron transport chains differ in the photo reactions?

Describe the electron transport chain. How does it work?

What form is carbon in before it’s captured to make sugar?

What is the role of Rubisco? How does it ‘fix’ carbon?

Where does the potential energy come from to ‘run’ the Calvin Cycle reactions?

What is G3P? What 2 things is it used for?

Why is hot weather a problem for plants with respect to photosynthesis?

Name some strategies plants use to reduce water loss.

What are autotrophs? Besides plants, name other autotrophs.

Bacteria are simple organisms with no organelles, like chloroplasts, but there are some bacteria that can do photosynthesis. How do they do it?

Answer 1

Answer 1. When photosystem I gets photo-excited, electron transfer reactions gets initiated, which results in reduction of a series of electron acceptors, eventually reducing NADP⁺ to NADPH and PS I is oxidized. The electrons are used to convert carbon dioxide into sugars.

Answer 2. NADPH and ATP produced in light reaction.

Answer 3. Calvin cycle uses 18 ATP and 12 NADPH molecules to produce one glucose molecule.

Answer 4. The PSI reaction center is replenished by electrons that flow down an electron transport chain from PSII. And the PSII reaction center gets electrons from water.

Answer 5. Electron transport chain is a redox reactions that transfer electrons from an electron donor to an electron acceptor. The transfer of electrons is coupled to the translocation of protons across a membrane, producing a proton gradient. The proton gradient is used to produce useful work and eventually sugar molecule.