Free Kingdom Animalia MCQs with Answers

671. Division of labor is not seen in which of these multicellular animals?

• A. Hydra
• B. Euplectella
• C. Blood fluke
• D. A and B

Explanation: Hydra and Euplectella do not show division of labor because they have a very simple body organization. Hydra has only tissue-level organization, so most of its cells perform more than one function instead of being specialized. Euplectella (a sponge) shows only cellular-level organization and lacks true tissues and organs, therefore division of labor is absent. In contrast, the blood fluke shows division of labor as it has an organ-system level of organization with specialized organs performing specific functions.So D is the correct option.

672. Placenta is related to:

• A. Sheep
• B. Spiny ant eater
• C. Duck bill platypus
• D. Kangaroo

Explanation: The correct answer is Sheep. Sheep are placental mammals, meaning they have a placenta that provides nutrients and oxygen to the developing fetus during pregnancy. This is characteristic of mammals in the class Eutheria. In contrast, the spiny ant eater and duck-billed platypus are monotremes, which lay eggs and do not have a placenta. Kangaroos are marsupials, and they give birth to underdeveloped young that continue to grow in a pouch instead of having a placenta.

673. Pseudocoelom is a characteristic feature of which of the following?

• A. Coelenterates
• B. Platyhelminthes
• C. Annelids
• D. Aschelminthes

Explanation: The pseudocoelom is a characteristic body cavity found in animals belonging to the phylum Aschelminthes, also known as Nemathelminthes. This cavity lies between the body wall and the digestive tract, but unlike a true coelom, it is not fully lined by mesodermal tissue. Instead, the outer side of the pseudocoelom is lined by mesoderm, while the inner side is lined by endoderm. This structural arrangement makes the pseudocoelom function as a hydrostatic skeleton, helping the animal maintain body shape and allowing efficient movement by providing resistance for muscle contraction. It also serves as a space for the distribution of nutrients, removal of metabolic wastes, and temporary storage of reproductive products. Because of its simplicity and functional importance, the pseudocoelom is considered a key evolutionary advancement in Aschelminthes, enabling them to survive in a wide range of environments.

674. Polymorphism is a characteristic feature of which group of animals?

• A. Cnidaria
• B. Annelida
• C. Platyhelminthes
• D. Echinodermata

Explanation: Polymorphism is a characteristic in which animals of the same species exist in two or more distinct forms, each performing different functions. This feature is commonly found in members of the phylum Cnidaria, also known as Coelenterata. Cnidarians include animals such as hydra, jellyfish, and corals. In these animals, two main structural forms are seen: the polyp form and the medusa form. The polyp is usually cylindrical and attached to a surface, while the medusa is umbrella-shaped and free swimming. These two forms help the organism carry out different roles in feeding, protection, and reproduction. Some cnidarians may also have further specialized forms within colonies, such as in corals and Portuguese man-of-war, where certain individuals are responsible for feeding, others for defense, and others for reproduction. This variety of forms within a single species or colony is what defines polymorphism.

675. The single main opening of the sponge cavity is known as?

• A. Ostia
• B. Osculum
• C. Sponogocoel
• D. Both a and b

Explanation: The osculum is the large opening in a sponge through which water exits after passing through the sponge's body for the purpose of filter feeding. It serves as the exit point for water carrying waste and facilitates gas exchange in sponges.

676. The skeleton of the sponges is in the form of variously shaped needle like structure called:

• A. Stipules
• B. Brails
• C. Spines
• D. Spicules

Explanation: Based on the explanations provided, the correct answer to the question is option D) Spicules. The skeleton of sponges is made up of small, needle-like structures called spicules. Spicules are composed of either calcium carbonate or silica and provide structural support to the sponge's body. They come in various shapes and sizes, depending on the species of sponge.

677. The animals which belongs to division radiata is/are?

• A. Sycon
• B. Leech
• C. Mites
• D. Aurelia

Explanation: Aurelia is a genus of jellyfish, and jellyfish are classified under the phylum Cnidaria. Cnidarians, which include jellyfish, are the group that falls within the division Radiata. They are characterized by radial symmetry and specialized stinging cells called cnidocytes.

678. Which one is not the characterstics of kingdom animalia?

• A. All animal are ingestive heterotrophs
• B. It is the largest kingdom
• C. All animal are eukaryotes
• D. All animals develop from the similar gametes

Explanation: Animals do not necessarily develop from similar gametes. While sexual reproduction involves the fusion of gametes (sperm and egg cells), the gametes can vary significantly in size, structure, and behavior among different animal species. Some animals have small, motile sperm cells, while others have larger, immobile egg cells. This variation in gametes is not a universal characteristic of all animals.

679. What is the origin of the acoelomate gut?

• A. Ectodermal
• B. Mesodermal
• C. Endodermal
• D. None of these

Explanation: The endoderm is the innermost primary germ layer, and it is the one responsible for giving rise to the epithelial lining of the digestive tract, respiratory system, and several other internal organs. The gut is derived from the endoderm during embryonic development. In acoelomates (a group of animals without a body cavity called a coelom), the gut lacks a coelom and maintains a solid, simple structure.

680. Which of the following organism has an eel like body?

• A. Chondrichthyes
• B. Osteichthye
• C. Cyclostomata
• D. Both A and B

Explanation: Cyclostomata have an eel-like body because their shape is long, slender, and cylindrical, resembling that of an eel.This body form helps them move easily through water and mud, allowing smooth, flexible swimming.Their streamlined shape also supports their parasitic or scavenging lifestyle by helping them attach to hosts or navigate narrow spaces.