Chapter 26, Problem 18A

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 18A

Correct answer :

The correct answer is option (D) spinning silk

Explanation of Solution

Explanation/justification for the correct answer :

Option (D) spinning silk. Spider webs are composed of a fluid protein secreted by glands, and woven into silk by structures known spinnerets at the end of the abdomen of a spider. They capture prey in silky webs. So, the correct answer is option (D).

Explanation for incorrect answer :

Option (A) defense. Spiders cover their prey up in a cocoon of silk until they are able to feed. So, this is an incorrect answer.

Option (B) getting rid of waste. Spiders create a silken web to capture prey. So, this is an incorrect answer.

Option (C) Circulation. Spider tends to capture prey using silken web. They wrap up their food until it is ready to eat. So, this is an incorrect answer.