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(A) In the early $1920$s,the prickly pear cactus was introduced into Australia. It spread rapidly into millions of hectares of rangeland,causing signi

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$A$ species of moth

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(A) In the early $1920$s,the prickly pear cactus was introduced into Australia. It spread rapidly into millions of hectares of rangeland,causing significant ecological damage. This invasive species was finally brought under control by introducing a cactus-feeding predator,specifically a moth species $(Cactoblastis cactorum)$,into the area. This is a classic example of biological control,where a natural predator is used to manage an invasive population.

Column-$I$	Column-$II$
$P$. Calotropis	$I$. Special chemical
$Q$. Cactus and Acacia	$II$. Camouflage
$R$. Monarch butterfly	$III$. Thorns
$S$. Some species of insects and frogs	$IV$. Glycosides

In the early $1920$s,the prickly pear cactus introduced into Australia caused havoc by spreading rapidly into millions of hectares of rangeland. Finally,how was it controlled?

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Match the following columns:
Column-$I$ Column-$II$
$P$. Calotropis $I$. Special chemical
$Q$. Cactus and Acacia $II$. Camouflage
$R$. Monarch butterfly $III$. Thorns
$S$. Some species of insects and frogs $IV$. Glycosides

Definition / Explanation: Ectoparasites

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