Which one of the following options is a pair of bacteria known as symbiotic nitrogen fixers living in soil?
Nostoc and Anabaena
Rhizobium and Frankia
Nitrosomonas and Nitrococcus
Azotobacter and Nostoc
Boost your performance with adaptive practice tests
Practice every concept in the syllabus
Compare your speed and accuracy with your peers
Download the app and practice on the go