Chapter 26, Problem 5A

Summary Introduction

Introduction :

Arthropods have complex organ systems that allow them to live in a variety of habitats. Adaptations to several organ systems, like the respiratory system and the nervous system, have contributed to the development of these animals.

Answer to Problem 5A

Correct answer :

The correct answer is option (A) 1.

Explanation of Solution

Explanation/justification for the correct answer :

Option (A) 1. The structure represents compound eye. Most arthropods have a pair of large compound eyes. Each compound eye has many hexagonal facets which see a part of an image. It can detect smell, and movement of prey, mates or predators. So, this is an incorrect option. So, the correct answer is option (A).

Explanation for incorrect answer :

Option (B) 2. This structure is the antennae. Antennae are long sensory structures that contain receptors for the senses of smell and touch. The antennae are attached to the head part of many arthropods. So, this is an incorrect answer.

Option (C) 3. The structure represents malpighian tubules. In most arthropods, cellular wastes are removed from the blood through malpighian tubules. Such tubules also help terrestrial arthropods retain water in their bodies in order to maintain a homeostatic water balance. Tubules are found in the abdomen in insects. Malpighian tubules are bound to an empty intestine containing the undigested food waste to be eliminated from the body. So, this is an incorrect answer.

Option (D) 4. This structure is the digestive tract. Arthopods have a complete one-way digestive system with a mouth, gut and an anus, along with many digestive enzymes. So, this is an incorrect answer.