Microbiology of Soils
Nitrogen fixation by the microorganisms can be detected by adopting the approach of

cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen
demonstrating growth in a nitrogen free medium
All of these
measuring15N2 by mass spectrometer

ANSWER DOWNLOAD EXAMIANS APP

Microbiology of Soils
A heterocyst is

a terminally differentiated cell that fixes nitrogen
the progenitor of cyanobacterial vegetative cells
a type of spore
a cell that carries out oxygenic photosynthesis

ANSWER DOWNLOAD EXAMIANS APP