The correct answer is option 2: Nectar of flower. Male mosquitoes, specifically the Anopheles species, do not feed on blood. Unlike female mosquitoes, male mosquitoes do not require blood meals to produce eggs. Instead, they feed on nectar and other sweet plant juices. This difference in feeding behavior is due to the fact that only female mosquitoes have the ability to lay eggs, hence the need for blood meals to provide the necessary nutrients for egg production. Male mosquitoes primarily feed on plant sources, such as nectar, to obtain energy for flight and survival. Therefore, they do not pose a direct threat as disease vectors since they do not bite humans or animals for blood meals.