Problem 106 - Objective Biology for NEET

Question

The presence of joint appendages is the speciality of phylum (a) Mollusca (b) Echinodermata (c) Arthropoda (d) Annelidia

Step-by-Step Solution

Answer

The correct answer is (c) Arthropoda.

Step 1: Understanding the question

The exercise is asking for the specific phylum of animals that are characterized by having joint appendages. The term appendage generally refers to any structure, like a limb, that protrudes from an animal's body. When the appendage is joint, it means it has one or more areas where it bends.

Step 2: Matching the characteristic with the correct phylum

Review the four options and use your knowledge in zoology to determine which phylum is known for having joint appendages. The phylum Arthropoda is distinguished by having joint appendages. The members of this phylum - arthropods, possess segmented bodies with jointed limbs.

Step 3: Confirming the answer

After identifying Arthropoda as the phylum characterized by joint appendages, confirm that the other options do not have this characteristic. Mollusks (Mollusca) are soft-bodied animals, often with a hard shell; Echinoderms have spiny skin and a water vascular system for movement; And annelids (Annelidia) are segmented worms. None of these phyla have joint appendages as a defining characteristic.

Key Concepts

Joint Appendages

In the study of Phylum Arthropoda, one notable feature is the presence of joint appendages. Joint appendages are various body parts that extend from the main body structure, such as legs, antennae, and even mouthparts. The joints in these appendages allow for a great range of motion, similar to how our knees and elbows work. This ability to move parts independently is crucial for arthropods, as it aids in various functions like walking, feeding, and sensing the environment. By having these specialized structures, arthropods can adapt to numerous habitats, from terrestrial to aquatic, enhancing their survival and evolutionary success. This versatility in movement and function is a key reason why arthropods, such as insects, arachnids, and crustaceans, make up the most diverse phylum in the animal kingdom.

Animal Classification

Animal classification helps scientists organize and understand the diverse species found in the animal kingdom. One of the primary ways to classify animals is through physical characteristics and traits, such as body structure, presence of a backbone, and appendage type. In our context, the presence of joint appendages is a defining feature used to classify the phylum Arthropoda.

• Members of Arthropoda include insects, crustaceans, and arachnids, all sharing jointed limbs.
• Being classified into a phylum allows researchers to predict certain behavioral and physical attributes of the members.
• This classification process aids in studying evolutionary patterns, relationships between species, and ecological roles.

Using such classifications, scientists can systematically study and make sense of the vast array of life forms. For students, learning about these classifications can deepen their understanding of the links and distinctions among animal groups.

Zoology

Zoology is the scientific study of animals and their biology. It covers a broad range of topics, from anatomy and physiology to behavior and evolution. Within zoology, understanding different phyla, such as Arthropoda, is crucial for recognizing the diversity of life and the evolutionary adaptations that have allowed these organisms to thrive. One of the major subfields of zoology is entomology, which focuses specifically on insects, a subgroup of arthropods.

• Entomologists study insect life cycles, ecology, classification, and how they interact with humans and other species.
• Research in zoology contributes to conservation efforts, helping to protect threatened species and their habitats.

Thus, zoology plays a fundamental role in broadening our comprehension of biological diversity and resolving challenges related to wildlife management and ecosystem conservation. By exploring the intricacies of organisms like those in phylum Arthropoda, zoologists pave the way for innovations in science and technology.