Name the microorganisms which can fix atmospheric nitrogen in the soil.

Name the microorganism which produces butyric acid.

Name the microorganisms which decompose cowdung biogas.

Which of the following can fix atmospheric nitrogen?

Read the following statement regarding the mineral (i) Both Rhiqobium and Frankia are free living in soil, but as symbionts, can fix atmospheric nitrogen. (ii) Ammonia synthesis by nitrogenase requires 16 ATP for each ammonia produced. (iii) While most of plants can assimilate nitrate as well as ammonium ions, the latter is quite toxic to plnats and hence cannot accumulate in them. (iv) Along with the transpiration stream, the nodules of some plants export the fixed nitrogen as urides. Which of these are correct

Name the bird which can fly backwards?

Select the correct combination of the statements (i-iv) regarding the characteristics of certain organisms. (i) Methanogens are archaebacteria which produce methane in marshy areas (ii) Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen (iii) Chemosnthetic autotrophic bacteria synthesise cellulose from glucose (iv) Mycoplasma lack a cell wall and can survive without oxygen The correct statements are

Name any two free living bacteria that fix atmospheric nitrogen and increase nitrogen content in the soil.

Name a bacterium that is present in the root nodules and fix atmospheric nitrogen.