Which of the following is a natural predator used in the biological control of aphids?

Ladybird beetle

The correct answer is Option (1)- Ladybird beetle

Ladybird beetles and dragonflies are used to get rid of aphids and mosquitoes, respectively.  Ladybird beetles, also known as ladybugs or ladybirds, are beneficial insects that feed on aphids, which are pests that can damage plants. Ladybird beetles are often introduced into agricultural fields or gardens as a form of biological control to naturally reduce aphid populations. Similarly, dragonflies are natural predators of mosquitoes and their larvae. Dragonflies are known for their voracious appetite for mosquitoes and are commonly used as a biocontrol agent to control mosquito populations in certain areas.

Trichoderma species are used to control several plant pathogens. Trichoderma species are filamentous fungi that have been widely used as biocontrol agents against various plant pathogens. Trichoderma species have the ability to colonize plant roots and inhibit the growth of pathogenic fungi through mechanisms such as competition for resources, production of antifungal compounds, and stimulation of plant defense responses. They are used in agricultural practices and integrated pest management strategies to suppress diseases caused by fungal pathogens.