No, they lay them on the surface of the water.
Yes, due to surface tension.
because of surface tension
Some insects can stand on the surface of water because water is usually adhesive and cohesive. This is made possible by the molecules in the water.
Mosquitoes and other small insects can stay afloat on water because water exhibits a property called "surface tension", where a thin film "seems" to cover the water surface. This has something to do with intermolecular forces of attraction.
Some mosquitoes lay eggs on the surface of the water while others will lay eggs in the wet, boggy ground surrounding water. This is why swarms are more seen during the summer months around bogs and wetlands. They can lay eggs on the ground surrounding water that lay dormant until water floods the ground.
Due to the property of surface tension water surface would act as a stretched membrane. So water skaters, mosquitoes could easily walk on the surface. If oil is mixed with water then surface tension would fall and mosquito cannot breed. That is why we sprinkle oil in fine droplets on stagnant water
Contaminated water directly causes Typhoid and Cholera but indirectly cause water breeding surface for mosquitoes which causes Malaria and Dengue
Some insects can stand right on the surface tension of the water.
Yes, mosquitoes thrive everywhere there are pools of water
mosquitoes breed and lay eggs on standing water
Yes, like other mosquitoes they breed in fresh, standing water.