Chapter 26, Problem 3STP

Summary Introduction

Introduction :

The arthropods are divided into groups according to the body segment, mouthparts, and appendages of their body. The groups include crustaceans, spiders and their relatives, and insect and their relatives. The crustaceans have two pairs of antennae, mandibles, two compound eyes, five pairs of legs, and they are swimmers. The spiders and their relatives do not have antennae, six pairs of legs, and two body sections. The insects and their relatives have antennae, three pairs of legs, and three body areas.

Answer to Problem 3STP

Correct answer :

The correct answer is option (C) 3.

Explanation of Solution

Explanation/justification for the correct answer :

Option (C) 3. The picture represents lobster that belongs to the group crustaceans of arthropod. The body that involves in the reproduction is swimmerets that are found behind the legs and in this picture it is represented as 3. So, the correct answer is option (B).

Explanation for incorrect answer :

Option (A) 1. The part in 1 represents the cheliped that are the large claws used to catch the food and crushing of the food. So, this is an incorrect option.

Option (B) 2. The part in 2 represents the walking legs of lobster. They use for the locomotion of the species. So, this is an incorrect answer.

Option (D) 4. The part in 4 represents the abdomen part used for the digestion of food. So, this is an incorrect answer.