Test: Classification of Animal Kingdom - UPSC MCQ

Autotrophic nutrition is not a characteristic of animals. Animals are heterotrophic, meaning they obtain nutrients by consuming other organisms or organic matter.

Their body structure and characteristics. Animals are classified based on their anatomical and physiological features, such as their body symmetry, presence or absence of a backbone, type of body covering, and other distinguishing traits.

Arthropoda. Arthropods, which include insects, crustaceans, spiders, and centipedes, among others, have the highest number of known species among all animal phyla.

They have a well-developed nervous system. Porifera, commonly known as sponges, have a cellular level of organization, are filter feeders, and possess specialized cells called choanocytes. However, they lack a well-developed nervous system.

The phylum Chordata includes animals that have a notochord or a backbone at some stage of their development. This phylum encompasses a wide range of animals, including fish, reptiles, birds, mammals, and more.

Insects have a network of tiny tubes called tracheae that deliver oxygen directly to their tissues. The openings to these tracheae are called spiracles, which are typically located on the sides of an insect's body.

Arthropods, including insects, crustaceans, and arachnids, undergo molting, also known as ecdysis, to grow and replace their exoskeleton. During molting, the old exoskeleton is shed, and a new, larger exoskeleton is formed.

Mammals are characterized by several features, including the presence of mammary glands, which produce milk for their young, warm-bloodedness, and the presence of hair or fur. However, mammals give birth to live young and do not lay eggs.

Arthropods have jointed appendages, which include legs, antennae, and mouthparts. This phylum comprises a vast array of diverse animals, such as insects, spiders, crabs, and millipedes.

Mollusca is not a class of vertebrates but a separate phylum that includes animals like snails, clams, and octopuses. The classes of vertebrates include Mammalia, Reptilia, Amphibia, and others.

Birds are known for their feathers, which provide them with insulation, enable flight, and play a role in courtship displays. Unlike reptiles, birds are warm-blooded and have a high metabolic rate.

The blue whale holds the title for being the largest animal on Earth. It can reach lengths of up to 100 feet and weigh over 150 tons.

- Animals that lay eggs and have scales are typically found in the class Reptilia.
- Reptiles include snakes, lizards, crocodiles, and turtles.
- Reptiles have dry, scaly skin that helps prevent water loss.
- They reproduce by laying eggs, often with leathery shells.
- While birds (Aves) lay eggs , they primarily have feathers.
- Amphibians and mammals do not have scales; mammals give live birth, and amphibians have moist skin.

Therefore Correct Answer - Option-B

Respiration is the process by which living organisms convert food into energy. It involves the breakdown of organic molecules, such as glucose, to release energy in the form of ATP (adenosine triphosphate).

Omnivores are animals that have a diet consisting of both plants and other animals. They can consume a wide range of food sources, including fruits, vegetables, insects, and small animals.

Cnidaria is the phylum that encompasses animals such as jellyfish, sea anemones, corals, and hydroids. These organisms have specialized cells called cnidocytes, which contain stinging structures used for prey capture and defense.

Spiral symmetry is not a type of symmetry found in animals. The three common types of symmetry observed in animals are bilateral symmetry (divisible into two equal halves), radial symmetry (multiple planes of symmetry around a central axis), and asymmetry (lack of any defined symmetry).

Invertebrates are animals that lack a backbone or vertebral column. This diverse group includes insects, mollusks, worms, jellyfish, and many other organisms.

The phylum Mollusca comprises animals with soft bodies, often protected by a hard shell. Snails, clams, octopuses, and squids are examples of animals belonging to this phylum.

Insects are characterized by having three pairs of legs, a body divided into three sections (head, thorax, and abdomen), and typically two pairs of wings. They are the most diverse group of animals on Earth, with over a million described species.