What are non-chemical methods of mosquito control?

The correct answer focuses on the physical removal of breeding sites as a non-chemical method of mosquito control. This approach is essential because mosquitoes breed in stagnant water, and eliminating these breeding habitats significantly reduces their populations. By removing sources such as standing water in containers, clogged gutters, and puddles, we can disrupt the mosquito life cycle and effectively control their numbers without relying on chemical interventions.

Other options involve different strategies that do not directly fit into non-chemical methods. Heavy use of pesticides clearly represents a chemical control method rather than a non-chemical one, as it involves the application of chemicals specifically designed to kill or repel mosquitoes. Planting trees to block sunlight could influence the local environment, but it does not directly address the breeding or population control of mosquitoes. Building large water reservoirs may inadvertently create more breeding sites for mosquitoes, as they can collect and retain stagnant water, which contributes to the lifecycle of these pests. Hence, the physical removal of breeding sites stands out as the most effective non-chemical strategy.