Hydrophonics is a system of growing plants in –

Choose the correct statement(s) –

I. Solution culture / Hydrophonics contains all essential minerals except one, the usefulness of which is to be determined

II. Na, Si, Co and Selenium are beneficial element required by higher plants

III. Zn is the activator of nitrogenases while Mo is the activator of alcohol dehydrogenase

IV. Zn is needed for auxin synthesis

During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by

The enzyme nitrogenase is extremely sensitive to :

Which of the following can fix nitrogen in nonleguminous plants ?

Find the group of bacteria in which all are nitrogen fixing :–

How many of the following organisms not fix the atmospheric nitrogen in free living condition?

Frankia, Anabaena, Rhodospirillum, Bijernickia, Rhizobium, Azotobacter, Nostoc.

Which of the following elements is responsible for maintaining turgor in cells?

Thiobacillus is a group of bacteria helpful in carrying out