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Rhizobia: Quiz


Question 1: Although much of the nitrogen is removed when ________-rich grain or hay is harvested, significant amounts can remain in the soil for future crops.

Question 2: For instance, the plant pathogen ________ is a closer relative of Rhizobium than the Bradyrhizobium that nodulate soybean (and may not really be a separate genus).
BacteriaGenomeAgrobacterium tumefaciensAgrobacterium

Question 3: This is especially important when nitrogen ________ is not used, as in organic rotation schemes or some less-industrialized countries.

Question 4: Rhizobia are soil bacteria that fix nitrogen (diazotrophy) after becoming established inside root nodules of legumes (________).
Flowering plantFaboideaeFabaceaePlant

Question 5: Sanctions could take the form of reduced nodule growth, early nodule death, decreased carbon supply to nodules, or reduced ________ supply to nodules that fix less nitrogen.

Question 6: The word rhizobia comes from the ________ ῥίζα, "rhíza," meaning "root," and βίος, "bios," meaning "life." The word rhizobium is still sometimes used as the singular form of rhizobia.
Ancient GreekAeolic GreekDoric GreekAttic Greek

Question 7: Bacteria that do associate with plants include the actinobacteria Frankia, which form symbiotic root nodules in ________, and several cyanobacteria (Nostoc) associated with aquatic ferns, Cycas and Gunneras.
Actinorhizal plantRosidsFagalesNitrogen fixation

Question 8: Rhizobia are a ________ group which fall into two classes of the proteobacteria—the alpha- and beta-proteobacteria.
CladisticsDNA barcodingParaphylyClade

Question 9: Most research has been done on crop and forage legumes such as clover, ________, beans, and soy.

Question 10: But this form of cheating should be equally tempting for all strains, a classic ________.
Food securityEcological footprintTragedy of the commonsEnvironmental economics


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