What is referred to as stages without metamorphosis?

The correct answer identifies the developmental stages of certain insects that do not undergo significant morphological changes as they progress from one stage to the next. Insects classified under "stages without metamorphosis" typically go through the egg, followed by a series of immature stages that are often referred to as "young" or "nymphs," before reaching the adult stage.

In this context, 'Young' refers to the immature forms which are similar in appearance to the adult but may not be fully developed. They grow and mature without undergoing a drastic transformation, hence the term "without metamorphosis."

In contrast, the other options include terms that imply more distinct transitional phases. For instance, 'Nymph' typically indicates a juvenile form associated with hemimetabolous insects that do go through some changes, while 'Larva' suggests a significant transformation from egg to pupa before becoming an adult, seen in holometabolous insects. 'Pupa' also indicates a transitional stage involving metamorphosis where the larva undergoes transformation into an adult. Thus, the progression in the correct answer aligns with the concept of development stages that do not involve such drastic changes.