Question

Which of the following is the smallest insect?
A. Fairyflies
B. Houseflies
C. Fruit Flies
D. Sandflies

Answer 1

Hint: These are commonly known as wasp which lives in tropical and temperate regions and are around 0.13 to 0.5 mm in length.

Complete answer:
Insects are living organisms having exoskeleton with three pair bodies (head, thorax and abdomen), two antennae, four wings and six legs. Exoskeleton is the outermost hard coating constituting chitin which protects the insects from the predators. These are complex organisms with more than millions of species known. Insects step by flying, walking or swimming. The life span of insects may be either one day to fifty years.
Houseflies are grey in colour with one pair of wings and compound eyes. They are around 4 to 7.5 mm long and are common flies which are found all over the homes. These are of the annoying insect with no teeth. Houseflies have less lifespan but they can reproduce in maximum numbers resulting in many housefly populations. Houseflies are the carrier for potent diseases.
Fruit Flies are also known as vinegar flies or Drosophila are yellow to brown with red eyes. They have a three pair body with a pair of legs and a pair of wings. Houseflies grasp the attention of fruits and vegetables and sometimes to cans etc. In males and females fruit flies are distinct. In male: the abdomen is large with black bands and females have constrict black bands. The primary role of fruit fly is in the study of heredity as they have small lifespan with good reproduction rate and have characteristics like eye colour and wing shape.
Sandflies: Belongs to family Psychodidae which around 3 mm long (small flies) brownish golden in colour. They have a large piercing mouthpart for the blood suction from the host. Sandflies have a characteristic feature which distinguishes them from other fruit flies: can hold their hairy wings in a vertical V shape at rest.
Fairyflies: are small wasps which have fairy-like wings. These belong to the family of Mymaridae which are one of the smallest known wingless insects. They are about 0.5 mm in length. Fairyflies have small cells and their structure is comb like made of many bristles. The body size is small having limited constraints like physical, structural or physiological structures.

Therefore, the correct answer is A.

Note: The species like Tinkerbella nana and Kikiki huna are the two smallest insect species of the family Mymaridae. The very smallest fairy flies do not have working digestive, reproductive, circulatory organs but their bigger ancestors are different.