The aquatic fern used to increase the yield in paddy crops is Azolla. Azolla is a floating fern that can fix atmospheric nitrogen, providing a natural source of nitrogen to rice paddies.
So, the correct option is (A): Azolla


The output (Y) of the given logic implementation is similar to the output of an/a …………. gate.
There are several valuable microorganisms that are beneficial to humans in various manners such as: