Match the columns:
Column-$I$Column-$II$
$(a)$ Mycorrhiza$(1)$ Rhizobium
$(b)$ Bt$(2)$ Nucleopolyhedrovirus
$(c)$ Root nodules$(3)$ Phosphorus
$(d)$ Baculovirus$(4)$ Bt-Cotton

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$(A)$ The correct matches are as follows:
$(a)$ Mycorrhiza is a symbiotic association between fungi and roots of higher plants, which helps in the absorption of $(3)$ Phosphorus.
$(b)$ Bt refers to Bacillus thuringiensis, which is used to create $(4)$ Bt-Cotton.
$(c)$ Root nodules are the site of nitrogen fixation in leguminous plants, formed by $(1)$ Rhizobium.
$(d)$ Baculovirus are pathogens that attack insects and other arthropods, specifically the genus $(2)$ Nucleopolyhedrovirus.
Therefore, the correct sequence is $(a-3, b-4, c-1, d-2)$.

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