Chapter 26, Problem 27A

Summary Introduction

Introduction :

Arthropods are grouped into classes based on common characteristics, such as body segment form, appendages and mouthparts. The naming of arthropods is still questioned by taxonomists. Arthropods have joint-appended exoskeletons that allow them to move in diverse ways.

Answer to Problem 27A

Correct answer :

The correct answer is option (B) 2

Explanation of Solution

Explanation/justification for the correct answer :

Options (B) 2. The Egg is the first stage of incomplete metamorphosis. The insect must hatch during this time into a shape called a nymph. By fact, the nymph is a small form of the adult insect. So, the correct answer is option (B).

Explanation for incorrect answer :

Option (A) 1. Complete metamorphosis starts with insect newly hatched from an egg into a soft worm-like form called a larva. So, this is an incorrect answer.

Option (C) 3. The insect will make a hard shell at the end of the larval stage and will become a pupa within. So, this is an incorrect answer.

Option (D) 4. The body of the larva within the pupa will change completely into a fully grown adult. After the adult leaves the pupa it gradually spreads out and relaxes for a few hours in the sun until the exoskeleton dries out and stiffens. So, this is an incorrect answer.