Which insect develops through gradual metamorphosis?

The correct answer focuses on the life cycle of the cockroach, which undergoes gradual metamorphosis, also referred to as hemimetabolism. In this type of metamorphosis, the insect develops through three stages: egg, nymph, and adult. The nymphs resemble miniature versions of the adults and gradually grow and develop into mature forms without a significant transformation in appearance that characterizes complete metamorphosis (holometabolism).

In contrast, fungus gnats and wasps typically undergo complete metamorphosis, where their life cycle includes distinct egg, larval, pupal, and adult stages. Carpenter ants also exhibit complete metamorphosis. The presence of a pupal stage in these insects adds a significant transformation aspect that is absent in the development of cockroaches.

Understanding the life cycle of these insects highlights the differences in developmental processes among various groups, with the gradual metamorphosis of the cockroach illustrating a more straightforward progression from nymph to adult, making it easier to identify and manage in pest control scenarios.