Question

Many species of cockroach have no economic importance explain by giving valid reason

Answer 1

The cockroaches are an ancient group, dating back at least as far as the Carboniferous period, some 320 million years ago. Those early ancestors however lacked the internal ovipositors of modern roaches. Cockroaches are somewhat generalized insects without special adaptations like the sucking mouthparts of aphids and other true bugs; they have chewing mouthparts and are likely among the most primitive of living neopteran insects. They are common and hardy insects, and can tolerate a wide range of environments from Arctic cold to tropicalheat. Tropical cockroaches are often much bigger than temperate species, and, contrary to popular belief, extinct cockroach relatives and 'roachoids' such as the Carboniferous Archimylacris and the Permian Apthoroblattina were not as large as the biggest modern species.

Some species, such as the gregarious German cockroach, have an elaborate social structure involving common shelter, social dependence, information transfer and kin recognition. Cockroaches have appeared in human culture since classical antiquity. They are popularly depicted as dirty pests, though the great majority of species are inoffensive and live in a wide range of habitats around the world.

Answer 2

Concept introduction

Cockroaches are a very old species; its predecessors lived between $300$ and $500$ million years ago, during the Carboniferous period. But unlike contemporary roaches, these primitive relatives lacked the internal ovipositors. Cockroaches are among the most basic extant Neopteran insects, being rather generalist insects without unique adaptations (such the sucking mouthparts of aphids and other true bugs). Instead, they have gnawing mouthparts. They are widespread, robust insects that can survive in a variety of climatic conditions, from Arctic cold to tropical heat. Cockroaches from the tropics are frequently bigger than those from the temperate zones. Contrary to common opinion, the largest current species was not as enormous as extinct cockroach cousins (Blattoptera) and 'roachoids' like the Carboniferous Archimylacris and Apthoroblattina.

Given

Many species of cockroach have no economic importance.

Find

Why many species of cockroach have no economic importance.

Solution

Some species, like the sociable German cockroach, have complex social structures that include shared housing, social dependency, information sharing, and kin recognition. Since classical antiquity, cockroaches have been a part of human civilization. They are often portrayed as filthy pests, yet the vast majority of species are harmless and may be found in a variety of global settings.

Hence, some species of cockroaches do not have economic importance because they do not contribute in developing anything productful.

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