Although a large number of insects are injurious to crops and are to be eliminated or effectively kept under check, there are a number of insects which are of use to man in a number of ways and need protection. There are many crops, particularly those of fruits and vegetables that cannot be successfully grown and harvested without the active [...]
5The three universally appreciated insects are the honey-bee, the lac insect, and the silkworm. Honey extraction from wild hives is definitely a case of exploitation, but modern bee-keeping provides an illustrious example of science enabling man to enter into a just and ethically sound partnership at least with one species of honey-bee. The relationship with the lac insect also need [...]
The classification of insects into various orders is based on the presence or absence of wings and their venation, type of mouth parts, type of metamorphosis and characteristics of antennae and tarsi. The class Insecta has two subclasses, Apterygota, the primitive wingless insects, and Pterygota, insects with wings (although some of them may be secondarily apterous). Initially, there were 29 [...]