Why is the chlorophyll in chloroplasts less likely to produce fluorescence compared to extracted chlorophyll molecules?

Video transcript

Hi everyone. Let's look at the next problem. It says identify the incorrect statement about chlorophyll. So let's look for our answers, remembering that we're looking for an incorrect statement. So Choice A says chlorophyll is the accessory photosynthetic pigment. Well this is false. Chlorophyll is not the accessory pigment. Chlorophyll is the main photosynthetic pigment. So right away I say we have our incorrect statement so we'll highlight that. But just to be thorough, let's go through the other ones. Choice B says. The chlorophyll that is extracted shows more fluorescence as compared to chlorophyll in chloroplast. Well this is correct. That's because in the chloroplasts the energy that's absorbed by the chlorophyll is converted to chemical energy by the electron transport chain or by the or more correctly by the reducing the electronic sectors in the electron transport chain. So that converts the light energy, the energy from the sunlight into chemical energy in the cells. However, when chlorophyll is extracted, all those structures in the chloroplast that make up that electron transport chain, and all the supporting structures are broken during the extraction process. So instead of that energy being converted to chemical engineering energy, the energy absorbed by chlorophyll is instead given off as fluorescence and or heat. So you've broken down physically all the structures that convert the absorbed energy to chemical engineering. So instead we see it fluorescent or it gives off heat because it can't process that energy anymore. So that's a correct statement. That's true and therefore Choice B is not our answer. Choice C says chlorophyll and chloroplasts converts light energy into chemical energy. Well, that is true, as we just discussed by the reduction of the electronic sectors in that electron transport chain, uh the cell produces a. T. P. As a source of chemical energy. So that's a correct statement, and therefore not our answer. And finally, Choice D. The chlorophyll of bacteria is called bacterial chlorophyll, and that is true. That is what the chlorophyll in bacteria is. So not our answer. So again, the incorrect statement about chlorophyll choice A chlorophyll is the accessory photosynthetic pigment. See you in the next video.