Design an experiment, using radioactive carbon and the heavy isotope of nitrogen (15N2), that would test whether the rhizobia–pea plant interaction is mutualistic.

Video transcript

Hi everyone. Here's our next question what type of symbiotic association? This presence between the plants of the fiba. See family and rizzo be a bacteria. First of all if abc family are legumes which is a lot easier to say. So we'll call them that. And let's recall more content videos what sort of symbiotic association may have. Well the rizzo bia live in root nodules have like games and they obtain shelter from that relationship. Um But meanwhile they fix atmospheric nitrogen by converting it to nitrates and making it available to the plant. And of course nitrogen is one of the limiting nutrients for plants. It's a macro nutrient needed them pretty large quantities. So we can see that both organisms benefit in this relationship and we can recall from our content videos that a symbiotic association where both benefit is choice c mutual ism because they mutually benefit. Let's just look at our other answer choices to understand what they are. Voice A is commence Eliza um commence cell is um is when one organism benefits and the other is unaffected. Example. This is barnacles on whales. The barnacles benefit from additional food source and the food that surround the whale. Um the whale is unaffected by the presence of barnacles. So choice a. Is not our answer. Since both benefit choice be a mental is um incrementalism. one organism is harmed, the other is unaffected and we might wonder why that kind of relationship would take place and that would be sort of a form of competition where in a sense the unaffected organism does benefit in the end by um the harm done to the other example would be um antibiotics. So like the mold penicillin kills bacteria in its vicinity so the penicillin is unaffected by its relationship. Um But the bacteria is harmed but that's not our correct description here. So we eliminate that. And finally. Choice the parasitism that's when one benefits And one is harmed. So like the presence of a tapeworm and a person but not the answer here. So again the symbiotic association between legumes and Rizzo be a bacteria is choice e mutual ism. See you in the next video.