Biological indicator of pollution of sulfur dioxide is: -

In the nitrogen cycle, soil nitrates are converted into free nitrogen by whom?

Which of the following protocols is not correctly related to its issue?

Where is Dachigam National Park?

Direction: What should come in place of the questions mark (?) in the following letter series?
reoc, pgme, nikg, Ikii, ? 

Direction: What should come in place of the questions mark (?) in the following letter series?
a, k, e, o, i, s,  ? __ ? _ , q , a , u , e 

Direction: Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it.
ab_bba _ _bba _abb _ _a 

Direction: Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it.
a_b_ba_b_ ba