Free Kingdom Animalia MCQs with Answers

761. Saclike digestive system is present in:

• A. Porifera
• B. Platyhelminthes
• C. Arthropoda
• D. Chordates

Explanation: Platyhelminthes has flat worms. They are triploblastic and have mouth which opens into a gut but no anus so their digestive system is termed as sac like.

762. Which of the following is the exclusive character of mammals?

• A. Homeothermic
• B. Poikilothermic
• C. Hair
• D. Four chambered heart

Explanation: Hair is a defining characteristic of mammals. Most mammals have hair or fur covering some or all of their bodies. This feature distinguishes them from other animal groups.

763. The best function of coelom is described as _.

• A. To increase the size of the animals
• B. To help in the functioning of reproductive system
• C. To provide space for the development of organs and systems
• D. All of these options are correct

Explanation: Coelom is the fluid-filled body cavity of an animal that contains all the organs. It is more evidently recognized in the beginning stages of development. As we have read on the basis of coelom, animals are divided into three categories, acoelomate(no coelom), pseudocoelomate(false coelom), and coelomate(true coelomate). This is a cavity found in the walls of the mesoderm. It provides space for organs and body parts to grow in. In most animals, it is located between the intestinal canal and the body cavity. Ceolom is the space surrounded by mesoderm. It is used as a sort of cushion for the inner organs. It also allows the body to bend and move around without possibly harming your inner organs and allows your organs to expand. So, option C is correct.

764. Flame cells in Planaria constitute the:

• A. Digestive system
• B. Reproductive system
• C. Respiratory system
• D. Excretory system

Explanation: Flame cells function like the kidney, removing waste materials throug filteration. The cilia propel waste matter down the tubules and out of the body through excretory pores that open on the body surface; cilia also draw water from the interstitial fluid, allowing for filteration.

765. All of the following coelenterates show alternation of generation except?

• A. Hydra
• B. Obelia
• C. Aurellia
• D. All of these options are correct

Explanation: Hydra does not show alternation of generation in its life cycle. It also does not have any larval stage during its life cycle.

766. Which of the following is not a mammal?

• A. Goat
• B. Whale
• C. Shark
• D. Seal

Explanation: Mammals are a group of warm-blooded animals that give birth to their offspring such that the young are fed with milk produced in their mother's mammary glands, have fur or hair on their body, and have enhanced brain functions. Examples: Whales, goats, cows, seals, dogs, etc. The shark is a cartilaginous fish that belongs to the Chondrichthyes class of Pisces.

767. The name 'Animal' is derived from the word _.

• A. Aname
• B. Anemia
• C. Anima
• D. None of these

Explanation: The word animal comes from the Latin word anima or animalis, meaning 'having breath', 'having soul', or 'living being'. Anaemia is a condition in which you lack enough healthy red blood cells to carry adequate oxygen to your body's tissues so Option B is not correct. Option A is also not correct.

768. These animals have three germinal layers but no coelom

• A. Flatworms
• B. Roundworms
• C. Cnidarians
• D. Chordates

Explanation: Option A: Flatworms, also known as Platyhelminthes, have three germinal layers (ectoderm, mesoderm, and endoderm) but do not possess a true coelom. They have a solid body structure without a fluid-filled body cavity. Instead, they have a parenchyma, which is a loose tissue that fills the space between organs.Option B: Roundworms, also known as Nematodes, are another group of animals that have three germinal layers but lack a true coelom. They have an inner tube-like digestive tract but lack a fully developed body cavity. Instead, they possess a pseudocoelom, which is a partially lined body cavity.Option C: Cnidarians, such as jellyfish, corals, and sea anemones, have three germinal layers but do not have a coelom. They have a sac-like body plan with a central digestive cavity called the gastrovascular cavity. The gastrovascular cavity serves both as a digestive and circulatory system, but it is not considered a true coelom.Option D: Chordates, which include vertebrates (animals with a backbone) and some invertebrates, have three germinal layers and possess a true coelom. Chordates have a well-developed body cavity that is fully lined by mesoderm. Examples of chordates include mammals, birds, reptiles, amphibians, and fish.

769. Which combination of class and its description is correct?

• A. Osteichthyes-A bony endoskeleton and gills covered by operculum
• B. Reptilia-Left aortic arch & internal fertilization
• C. Nematoda-Triploblastic & acoelomates
• D. Cephalopods-Dorsal nerve cord & bilateral symmetry

Explanation: Osteichthyes is the class that contains fish with bony endoskeletons and gill slits covered by an operculum.

770. All of the following are coelomates except:

• A. Deuterostomes
• B. Hemichordates
• C. Proterosomes
• D. Aschelminthes

Explanation: These are the animals having a true body cavity or coelom. The cavity is filled with coelomic fluid. Coelomates are classified as protosomes and deuterostomes. OPTION A: Deuterostomes develop the anus first, then the mouth at the other end of the embryo. Deuterostomes are coelomate animals. OPTION B: All the animals from phylum Annelida to the phylum Chordata are coelomates. OPTION C: Protostomes develop so that the first opening in the embryo is the mouth. Protostomes are bilaterally symmetrical and have three germ layers, the organ level of organization, the tube within-a-tube body plan, and a true coelom. OPTION D: Aschelminthes are called pseudocoelomates. Hence, D is the correct option.