Browse Questions

# Which is the best fertilizer?

$\begin{array}{1 1}(A)\;\text{Synthetic fertilizer}\\(B)\;\text{Bacillus thuringiensis and lichen}\\(C)\;\text{Azolla and cyanobacteria}\\(D)\;\text{All the above}\end{array}$

Azolla and cyanobacteria
Hence (C) is the correct answer.