(C) $Parthenium \, hysterophorus$ (carrot grass / congress grass) is a highly invasive weed belonging to the family $Asteraceae$.It was introduced int

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(C) $Parthenium \, hysterophorus$ (carrot grass / congress grass) is a highly invasive weed belonging to the family $Asteraceae$.It was introduced into India from the $USA$ in the $1950$s as a contaminant along with imported wheat.Since its introduction,it has spread rapidly across all parts of India,causing severe ecological and health issues.