Final answer:
The order of insects with coiled, siphoning mouthparts used to drink liquids is Lepidoptera, which includes moths and butterflies. These insects use a proboscis to sip nectar from flowers. The diversity of insect mouthparts, such as the siphoning proboscis, is a result of evolutionary adaptations to different diets and lifestyles.
Step-by-step explanation:
The order of insects that has coiled, siphoning mouthparts used to drink liquid is called Lepidoptera, which includes moths and butterflies. These insects have specialized mouthparts called a proboscis, which they use to sip nectar from flowers. The evolution of different insect mouthparts, including the siphoning type, is thought to have arisen due to the diverse dietary requirements and ecological niches insects occupy. This specialization allows each type of insect to exploit different food sources effectively.
Different insects have evolved various mouthparts adapted to their unique diets. For instance, aphids have piercing-sucking mouthparts, while insects such as grasshoppers have chewing mouthparts. The mosquito has piercing-sucking mouthparts adapted for piercing skin and sucking blood, while the housefly has sponging mouthparts for mopping up liquid food.
This diversity in mouthpart structure is directly related to the lifestyle and feeding habits of the insect. Insects such as butterflies and moths have adapted to a diet of liquid nectar, hence the evolution of a long, coiled proboscis that acts like a straw facilitating the siphoning of liquid into their digestive system.