Which of the following insects has a flattened dorso-ventrally body?

The choice of cockroaches as the insect with a flattened dorso-ventrally body is accurate. Cockroaches possess a distinct body shape characterized by being flattened from top to bottom, which allows them to navigate through narrow spaces and conceal themselves effectively. This morphological adaptation is particularly useful for their lifestyle, as many species are nocturnal scavengers that thrive in various environments, including human dwellings.

In contrast, beetles, ants, and bees generally have a more rounded or cylindrical body shape. Beetles are known for their hardened forewings that cover their bodies, contributing to a bulkier appearance. Ants, while having a constricted waist, exhibit a more rounded profile overall. Similarly, bees have a fuzzy and rounded body due to the presence of hair that aids in pollen collection. These differences in body structure reflect the various ecological niches and behaviors of each group, making the flattened body of cockroaches distinctive among the options given.