The yield of a paddy field can be increased by the application of:

Farmers have reported over $50\%$ higher yields of rice by using which of the following biofertilizer?

Consider the following four statements $(A - D)$ related to organic farming and select the correct option stating which ones are true $(T)$ and which ones are false $(F)$. The statements :
$(A)$ Produces food crops rich in lipids,vitamins and iron
$(B)$ Uses biofertilisers which increases soil fertility
$(C)$ There is more use of chemical fertilisers and pesticides
$(D)$ Raising unpolluted crops through the use of bacteria,fungi and cyanobacteria

Azolla is used as a biofertiliser because it

Match the following columns correctly:

Column-$I$	Column-$II$
$(a)$ $Rhizobium$	$(i)$ $Mycorrhiza$
$(b)$ $Azospirillum$	$(ii)$ $Paddy$ $field$
$(c)$ $Glomus$ $fungi$	$(iii)$ $Leguminous$ $plants$
$(d)$ $Cyanobacteria$	$(iv)$ $Free-living$ $bacteria$

Which free-living nitrogen-fixing cyanobacterium shows a symbiotic relationship with the water fern Azolla?