Option 1: "human blood" - Male mosquitoes do not feed on blood as they do not require it for reproduction. Only female mosquitoes feed on blood to obtain essential nutrients for egg development.
Option 2: "standing water" - Male mosquitoes do not obtain food from standing water. Standing water is a breeding ground for mosquitoes, where females lay their eggs.
Option 3: "sap of plants" - Correct answer. Male mosquitoes primarily feed on plant nectar or sap as a source of energy. They use this energy to fly and mate.
Option 4: "dung and debris" - Male mosquitoes do not feed on dung and debris. This option is incorrect.
In conclusion, male mosquitoes obtain their food from the sap of plants, primarily feeding on plant nectar to sustain themselves.