The main sources of biofertilisers are:
$(a)$ Bacteria
$(b)$ Cyanobacteria
$(c)$ Fungi
$(d)$ Protists

  • A
    $(a), (b), (c)$
  • B
    $(a), (b), (d)$
  • C
    $(b), (c), (d)$
  • D
    $(a), (c), (d)$

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