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Chapter 43: Problem 1

Distinguish between direct and indirect development and give examples of each.

Short Answer

Expert verified
Direct development is when the offspring resemble the adult form at birth or hatching, with no larval stages, such as in humans. Indirect development involves a significant transformation from a larval stage to the adult form, as seen in butterflies or moths.

Step by step solution

01

Direct Development Definition

Direct development is a type of animal development in which the offspring closely resembles the adult form at birth or hatching. In this type of development, there are no intermediate larval stages. The offspring grow and molt until they reach maturity.
02

Direct Development Example

An example of direct development can be observed in mammals such as humans. When a human baby is born, it has the same body structure as an adult, only smaller and less developed. Over time, with proper growth and development, the baby will mature into an adult human.
03

Indirect Development Definition

Indirect development is a type of animal development where the offspring undergo a significant metamorphosis or transformation from their larval form to their adult form. The larval stage is distinct from the adult stage, and typically the larvae have different structures and habits than the adult animals.
04

Indirect Development Example

A well-known example of indirect development is the life cycle of insects like butterflies or moths. These insects start as eggs that hatch into caterpillars (the larval stage). The caterpillars grow and then undergo metamorphosis, where they transform into a pupa or chrysalis. Finally, the adult butterfly or moth emerges from the pupa, having a completely different body structure and lifestyle compared to the caterpillar. So, in conclusion, direct development is when the offspring closely resemble their adult form at birth or hatching, such as humans, while indirect development involves a significant transformation from a larval stage to the adult form, like butterflies or moths.

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