Which two mosquito life stages do not feed on any type of food?

The correct answer highlights that both the egg and pupal stages of mosquitoes do not feed on any type of food. During the egg stage, the developing embryos are nourished by the yolk within the egg and do not require external food sources. This stage is critical as it sets up the next generation of mosquitoes.

Similarly, in the pupal stage, the mosquito undergoes its transformation from larva to adult, known as metamorphosis. During this stage, the pupa does not feed as it is typically inactive and does not consume food; instead, it relies on the energy stored from the larval stage.

Understanding these life stages is vital in mosquito biology and control practices, as it influences when and how control measures should be implemented—primarily focusing on larval stages for effective mosquito population management. Additionally, the other options incorrectly identify stages that do feed, such as larvae, which actively feed on organic matter in the water, and adults, which require nourishment from blood or nectar for reproduction and energy.