During which stage do mosquitoes primarily feed and grow?

The correct choice is larva because this stage is when mosquitoes primarily feed and grow. In the larval stage, commonly referred to as "wigglers," these aquatic insects actively consume organic matter, algae, and other microorganisms present in the water. Their feeding behavior is crucial for their development, as they require energy and nutrients to progress to the next stage of their life cycle.

During the egg stage, the mosquitoes are not feeding but are instead in the process of being laid and developing. In the pupal stage, mosquitoes undergo metamorphosis; they do not feed during this time, as they are transitioning into adults. The adult stage does involve feeding, but it is primarily focused on blood meals for females for reproductive purposes, while males typically feed on nectar and other plant sugars.

Understanding which stage is responsible for growth and feeding is fundamental to mosquito control strategies, as targeting larvae in water sources can significantly reduce their population before they mature into adults.