Predict how the following conditions would affect the production of O2, ATP, and NADPH and state whether noncyclic or cyclic electron flow would occur in each: (1) Only blue photons hit a chloroplast

Video transcript

Hi everyone. Let's look at our next problem. It says pick the incorrect statement about cyclic and non cyclic photo phosphor relation, let's recall the photo phosphor relation is the light dependent reactions where light energy excites electrons to produce a T. P. In the first part of photosynthesis. So I'm just gonna put up a little sort of comparison chart to help us recall um the differences and similarities between cyclic and non cyclic photo phosphor relation. The cyclic photo phosphor relation uses photo system one only. It's called cyclic because the electron that is excited by the absorption of that solar energy is returned to the chlorophyll molecule. Um rather than being passed on to the electronic sector and ABP plus. So that's why it's cyclic. The electron cycle around. No any DPH is produced because the electron is recycled but a T. P. Is produced because as the electron travels down the electron transport chain, protons are pumped um across the concentration gradient or against the concentration gradient. They then go on to go through a teepee keenness and produce a teepee. So cyclic photo phosphor relation produces a teepee but not N. A. V. P. H. Non cyclic photo phosphor relation recall. Used photo systems one and 22 different chlorophyll molecules and the electrons rather than being recycled and passed back to the chlorophyll. After the light energy excites them. They are passed on to an electronic sector. The electronics sector being N. A. D people. S so that produces N. A. D. P. H. As part of that process as well as a T. P produced in the same way through that keamy osmosis And the electron does not need to be recycled because the photo system one gets its electrons in this case from water and it's from the license of a water molecule and that produces oxygen plus protons. That get used to establish that proton gradient plus electrons and that's the source of the electrons that go into photo system one get excited, passed on to photo system two and then eventually taken up by N A. D. P. Plus. So let's look through our answer choices. We're looking for the incorrect statement about these two types of photo phosphor relation. So choice A says A T. P is produced only by non cyclic photo cause for elation. Well, we can look at our chart here and see the A. T. P. Is produced by both types. So this statement is false. And therefore right off the bat we found are incorrect statement. Choice A A TPP is produced only by non cyclic correlation is an incorrect statement. But to be thorough, it just looked through our other statements here. Choice B says If chloroplast runs low in a teepee, the non cyclic photo phosphor relation stops. Well, this is true and that could be a little tricky to understand, but it's because when the chloroplasts is low in a teepee, then it doesn't have enough 80 P to run the Calvin cycle. And the Calvin cycle is what uses up the N A. D. P. H. So without the Calvin cycle proceeding, any DPH accumulates. So now we have a cell that's low in a teepee but has a building concentration of N A. D. P. H. And that favors a switch to cyclic photo phosphor relation which generates the A. T. P. That is needed but isn't producing any more excess N A D. P. H. So that's true. And therefore not our correct answer. Choice C says oxygen is produced only during non cyclic photo phosphor relation. And that's correct. Oxygen is produced as part of that process that generates the electrons for non cyclic photo phosphor relation in cyclic. You're not generating oxygen because the electrons being recycled. You're not using that water molecule to generate electrons. So that is true. And therefore not our correct answer. And finally, Choice D says a T P and n A D H are the main products of non cyclic correlation. And that is correct. 80 P and N A D P H both produced by non cyclic correlation. That's a true statement and therefore not our answer. So once again, the incorrect statement about cyclic and non cyclic photo phosphor relation is choice A A T P is produced only by non cyclic photo phosphor relation. See you in the next video