“Animal Kingdom” MCQ with Answer Explanation : NEET 2025.

Here below some basic MCQ's of animal kingdom with answer which is explained in details. Let's check one by one. Question 1:Which of the following phyla is characterized by the presence of a notochord, a dorsal hollow nerve cord, and pharyngeal slits at some stage of development? A) ArthropodaB) ChordataC) MolluscaD) Annelida Answer: B) Chordata Explanation: Chordates are characterized by having a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail at some stage in their development. This is a defining feature of the phylum. Question 2:Which class of animals is primarily characterized by the presence of feathers? A) MammaliaB) ReptiliaC) AvesD) Amphibia Answer: C) Aves Explanation: Aves, or birds, are the only class of animals that possess feathers, which are essential for flight, insulation, and display. Question 3:Which of the following is NOT a characteristic of mammals? A) Mammary glandsB) Hair or furC) Cold-bloodedD) Three middle ear bones Answer: C) Cold-blooded Explanation: Mammals are warm-blooded (endothermic) and possess mammary glands, hair or fur, and three middle ear bones, distinguishing them from cold-blooded animals. Question 4:What type of symmetry is exhibited by organisms in the phylum Cnidaria? A) Bilateral symmetryB) Radial symmetryC) AsymmetryD) Pentaradial symmetry Answer: B) Radial symmetry Explanation: Cnidarians, such as jellyfish and corals, exhibit radial symmetry, allowing them to be divided into similar halves around a central axis. Question 5:Which group of animals is primarily characterized by having a tough outer exoskeleton made of chitin? A) EchinodermataB) ArthropodaC) MolluscaD) Porifera Answer: B) Arthropoda Explanation: Arthropods, which include insects, arachnids, and crustaceans, have an exoskeleton made of chitin, providing support and protection. Question 6:In which of the following groups is external fertilization most commonly observed? A) MammalsB) BirdsC) AmphibiansD) Reptiles Answer: C) Amphibians Explanation: Amphibians typically exhibit external fertilization, especially during their breeding season in aquatic environments, where eggs and sperm are released into the water. Question 7:Which type of circulatory system is found in vertebrates? A) Open circulatory systemB) Closed circulatory systemC) Both A and BD) None of the above Answer: B) Closed circulatory system Explanation: Vertebrates have a closed circulatory system where blood is contained within vessels, allowing for efficient transport of nutrients, gases, and wastes. Question 8:Which of the following is a characteristic feature of echinoderms? A) Jointed legsB) Spiny skinC) ExoskeletonD) Gills Answer: B) Spiny skin Explanation: Echinoderms, such as starfish and sea urchins, are known for their spiny skin, which is a defining feature of the phylum. Question 9:Which type of animal is characterized by a segmented body and a coelom? A) CnidariaB) MolluscaC) AnnelidaD) Porifera Answer: C) Annelida Explanation: Annelids, such as earthworms and leeches, have a segmented body and possess a true coelom, which allows for greater complexity in body structure. Question 10:What is the primary mode of nutrition in sponges? A) AutotrophicB) HeterotrophicC) SaprotrophicD) Photosynthetic Answer: B) Heterotrophic Explanation: Sponges are heterotrophic organisms that filter feed on small particles in the water, using specialized cells called choanocytes. NEET & CET Aspirant Get Daily MCQ and update on Telegram : Click Here NEET & CET Aspirant Get Daily MCQ and Update on Whatsapp : Click Here Amazon Loot Deals : Click Here Question 11:Which of the following groups of animals are endothermic? A) FishB) ReptilesC) AmphibiansD) Birds Answer: D) Birds Explanation: Birds are endothermic (warm-blooded) animals, which means they can regulate their body temperature internally, unlike fish, reptiles, and amphibians, which are ectothermic. Question 12:The main respiratory structure in insects is: A) GillsB) LungsC) TracheaeD) Skin Answer: C) Tracheae Explanation: Insects breathe through a network of small tubes called tracheae that transport oxygen directly to their tissues. Question 13:Which of the following is a characteristic of reptiles? A) Moist skinB) Lungs for breathingC) External fertilization onlyD) Scales Answer: D) Scales Explanation: Reptiles have dry skin covered with scales, which helps to minimize water loss in terrestrial environments. Question 14:Which class of animals undergoes metamorphosis? A) MammaliaB) ReptiliaC) AmphibiaD) Aves Answer: C) Amphibia Explanation: Amphibians typically undergo metamorphosis, transitioning from a larval stage (like tadpoles) to an adult form (like frogs). Question 15:What type of symmetry do adult echinoderms exhibit? A) Bilateral symmetryB) Radial symmetryC) AsymmetryD) Pentaradial symmetry Answer: D) Pentaradial symmetry Explanation: Adult echinoderms, such as sea stars, exhibit pentaradial symmetry, which means they can be divided into five equal parts. Question 16:Which of the following is an example of a cnidarian? A) EarthwormB) JellyfishC) OctopusD) Sea cucumber Answer: B) Jellyfish Explanation: Jellyfish are cnidarians, which also include corals and sea anemones, and are characterized by their stinging cells called nematocysts. Question 17:Which of the following groups of animals are known for their ability to regenerate lost body parts? A) ArthropodsB) EchinodermsC) MollusksD) Mammals Answer: B) Echinoderms Explanation: Echinoderms, like starfish, have remarkable regenerative abilities, allowing them to regrow lost limbs or even entire sections of their bodies. Question 18:Which animal is known for having a three-chambered heart? A) FishB) AmphibiansC) BirdsD) Mammals Answer: B) Amphibians Explanation: Amphibians typically have a three-chambered heart, which consists of two atria and one ventricle, allowing for some mixing of oxygenated and deoxygenated blood. Question 19:Which of the following is NOT a characteristic of the phylum Porifera? A) Lack of true tissuesB) Presence of a body cavityC) Filter feedingD) Asymmetrical body plan Answer: B) Presence of a body cavity Explanation: Porifera (sponges) lack true tissues and a body cavity, which distinguishes them from more complex animal phyla. Question 20:Which of the following statements about mammals is TRUE? A) All mammals lay eggs.B) Mammals have hair or fur at some stage in their life.C) Mammals are exclusively aquatic.D) Mammals breathe through gills. Answer: B) Mammals have hair or fur at some stage in their life. Explanation: All mammals possess hair or fur at some point in their life cycle, which is a key characteristic of the class Mammalia. Question 21:Which of the following animals is a filter feeder? A) SharkB) WhaleC) OctopusD) Eagle Answer: B) Whale Explanation: Certain species of whales, like baleen whales, are filter feeders that strain small organisms from the water using baleen plates. Question 22:In which class of animals is the presence of mammary glands a defining feature? A) AvesB) ReptiliaC) AmphibiaD) Mammalia Answer: D) Mammalia Explanation: Mammals are characterized by the presence of mammary glands, which produce milk to nourish their young. Question 23:Which structure in the earthworm is primarily responsible for the circulation of blood? A) Aortic archesB) GillsC) TracheaeD) Hemocoel Answer: A) Aortic arches Explanation: Earthworms have a closed circulatory system where the aortic arches function like a heart, pumping blood through vessels. Question 24:Which of the following groups of animals are primarily herbivores? A) CarnivoresB) OmnivoresC) InsectivoresD) Ruminants Answer: D) Ruminants Explanation: Ruminants, such as cows and sheep, are specialized herbivores that have a multi-chambered stomach to digest plant material efficiently. Question 25:Which of the following organisms is considered an invertebrate? A) FrogB) StarfishC) TurtleD) Human Answer: B) Starfish Explanation: Starfish belong to the phylum Echinodermata and are invertebrates, meaning they lack a backbone. Question 26:What type of reproduction is primarily seen in cnidarians? A) Sexual reproduction onlyB) Asexual reproduction onlyC) Both sexual and asexual reproductionD) Parthenogenesis Answer: C) Both sexual and asexual reproduction Explanation: Cnidarians can reproduce both sexually (producing gametes) and asexually (through budding or fragmentation). Question 27:Which of the following is a characteristic of mammals that distinguishes them from reptiles? A) Laying eggsB) Cold-blooded metabolismC) Presence of hair or furD) Scales on the skin Answer: C) Presence of hair or fur Explanation: Mammals are characterized by the presence of hair or fur, unlike reptiles, which have scales. Question 28:Which of the following groups has members that can live both in water and on land? A) ReptilesB) BirdsC) AmphibiansD) Fish Answer: C) Amphibians Explanation: Amphibians, such as frogs and salamanders, are adapted to live in both aquatic and terrestrial environments. Question 29:What is the main function of the exoskeleton in arthropods? A) LocomotionB) Protection and supportC) RespirationD) Digestion Answer: B) Protection and support Explanation: The exoskeleton in arthropods provides protection from physical damage and helps maintain body structure. Question 30:Which of the following is NOT a type of symmetry? A) BilateralB) RadialC) PentaradialD) Quadrilateral Answer: D) Quadrilateral Explanation: Quadrilateral is not a type of biological symmetry. The recognized types of symmetry in animals include bilateral, radial, and pentaradial symmetry. Question 31:Which of the following animals is an ectotherm? A) HumanB) DolphinC) FrogD) Penguin Answer: C) Frog Explanation: Frogs are ectothermic (cold-blooded) animals, meaning their body temperature is regulated by the environment, unlike mammals, which are endothermic (warm-blooded). Question 32:What is the primary function of the dorsal fin in fish? A) LocomotionB) Balance and stabilityC) RespirationD) Feeding Answer: B) Balance and stability Explanation: The dorsal fin helps fish maintain balance and stability while swimming. Question 33:Which of the following groups is characterized by having a water vascular system? A) ArthropodaB) CnidariaC) EchinodermataD) Mollusca Answer: C) Echinodermata Explanation: Echinoderms, such as sea stars and sea urchins, possess a water vascular system used for locomotion, feeding, and gas exchange. Question 34:Which type of animal is known for having a beak? A) MammalsB) FishC) BirdsD) Amphibians Answer: C) Birds Explanation: Birds have beaks, which are specialized for their feeding habits, varying significantly among different species. Question 35:Which of the following structures is involved in gas exchange in fish? A) LungsB) GillsC) SkinD) Kidneys Answer: B) Gills Explanation: Gills are specialized structures that allow fish to extract oxygen from water for respiration. Question 36:Which group of animals has a cloaca? A) MammalsB) ReptilesC) BirdsD) Both B and C Answer: D) Both B and C Explanation: Reptiles and birds both possess a cloaca, a single opening for excretion and reproduction. Question 37:Which of the following is a characteristic feature of amphibians? A) ScalesB) FeathersC) Moist skinD) Mammary glands Answer: C) Moist skin Explanation: Amphibians typically have moist skin, which plays a vital role in respiration and hydration. Question 38:What type of body plan do flatworms (Platyhelminthes) exhibit? A) Radial symmetryB) Bilateral symmetryC) AsymmetryD) Pentaradial symmetry Answer: B) Bilateral symmetry Explanation: Flatworms exhibit bilateral symmetry, meaning their bodies can be divided into mirror-image halves along a single plane. Question 39:Which class of animals includes species that are primarily nocturnal and possess a highly developed sense of smell? A) MammalsB) ReptilesC) BirdsD) Amphibians Answer: A) Mammals Explanation: Many mammals, such as owls and some rodents, are primarily nocturnal and have evolved a highly developed sense of smell to navigate and find food in the dark. Question 40:Which of the following animals undergoes a life cycle that includes a larval stage? A) SharkB) ChickenC) FrogD) Rabbit Answer: C) Frog Explanation: Frogs undergo metamorphosis, starting as aquatic larvae (tadpoles) before transforming into adult frogs. Question 41:Which type of animal is known for having a notochord at some stage of its life cycle? A) InsectB) FishC) AnnelidD) Cnidarian Answer: B) Fish Explanation: Fish are chordates, and they have a notochord during their embryonic development, which is a characteristic of the phylum Chordata. Question 42:What type of symmetry do jellyfish exhibit? A) Bilateral symmetryB) Radial symmetryC) AsymmetryD) Pentaradial symmetry Answer: B) Radial symmetry Explanation: Jellyfish exhibit radial symmetry, allowing them to be divided into similar sections around a central point. Question 43:Which of the following is a function of the skeletal system in vertebrates? A) InsulationB) Blood productionC) RespirationD) Digestion Answer: B) Blood production Explanation: The skeletal system in vertebrates includes bone marrow, which is responsible for the production of blood cells. Question 44:Which of the following is a characteristic of reptiles? A) Laying eggs in waterB) Moist skinC) ScalesD) Mammary glands Answer: C) Scales Explanation: Reptiles have scales that help prevent water loss and provide protection. Question 45:Which type of animal has a closed circulatory system? A) FishB) InsectsC) JellyfishD) Sponges Answer: A) Fish Explanation: Fish have a closed circulatory system where blood is contained within vessels, allowing for efficient transport of oxygen and nutrients. Question 46:Which of the following animals is a marsupial? A) LionB) KangarooC) DolphinD) Ostrich Answer: B) Kangaroo Explanation: Kangaroos are marsupials, characterized by giving birth to underdeveloped young that continue to develop in a pouch. Question 47:Which structure in mammals is primarily responsible for the exchange of gases? A) GillsB) LungsC) SkinD) Heart Answer: B) Lungs Explanation: Lungs are the primary respiratory organs in mammals, facilitating the exchange of oxygen and carbon dioxide. Question 48:Which type of organism is most likely to have a cuticle? A) FishB) AmphibiansC) ReptilesD) Birds Answer: C) Reptiles Explanation: Reptiles have a tough, protective outer covering called a cuticle that helps to prevent water loss. Question 49:Which of the following is a defining characteristic of the phylum Arthropoda? A) Soft-bodiedB) Segmented bodyC) Radial symmetryD) No true tissues Answer: B) Segmented body Explanation: Arthropods, such as insects and crustaceans, have a segmented body plan and an exoskeleton. Question 50:What type of fertilization do most reptiles undergo? A) External fertilizationB) Internal fertilizationC) ParthenogenesisD) Budding Answer: B) Internal fertilization Explanation: Most reptiles reproduce via internal fertilization, where the male fertilizes the female's eggs inside her body. Question 51:Which of the following animals has a two-chambered heart? A) MammalsB) BirdsC) FishD) Amphibians Answer: C) Fish Explanation: Fish have a two-chambered heart consisting of one atrium and one ventricle, which efficiently pumps blood through their gills and to the rest of the body. Question 52:What is the primary feeding structure in bivalves? A) RadulaB) BeakC) GillsD) Tentacles Answer: C) Gills Explanation: Bivalves, like clams and oysters, use their gills for filter feeding, capturing food particles from the water. Question 53:Which of the following groups of animals primarily has a diet consisting of nectar and pollen? A) CarnivoresB) HerbivoresC) InsectivoresD) Pollinators Answer: D) Pollinators Explanation: Pollinators, such as bees and butterflies, primarily feed on nectar and pollen from flowers. Question 54:What is the function of the spicules in sponges? A) ReproductionB) Structural supportC) DigestionD) Respiration Answer: B) Structural support Explanation: Spicules provide structural support and protection to sponges, helping maintain their shape. Question 55:Which of the following best describes the reproductive strategy of frogs? A) OviparousB) ViviparousC) OvoviviparousD) Parthenogenetic Answer: A) Oviparous Explanation: Frogs are oviparous, laying eggs that develop externally, typically in water. Question 56:What type of circulatory system do arthropods have? A) Closed circulatory systemB) Open circulatory systemC) Both A and BD) None of the above Answer: B) Open circulatory system Explanation: Arthropods have an open circulatory system, where blood (hemolymph) bathes the organs directly in a hemocoel. Question 57:Which of the following animals is a filter feeder? A) GoldfishB) Whale sharkC) TarponD) Great white shark Answer: B) Whale shark Explanation: The whale shark is a filter feeder that consumes plankton and small fish by filtering water through its gills. Question 58:Which of the following is a primary characteristic of annelids? A) Soft-bodiedB) Segmented bodyC) Hard exoskeletonD) No true tissues Answer: B) Segmented body Explanation: Annelids, such as earthworms, have a segmented body structure, which allows for greater flexibility and movement. Question 59:What type of locomotion do most mollusks use? A) SwimmingB) WalkingC) Jet propulsionD) Crawling Answer: D) Crawling Explanation: Most mollusks, such as snails and slugs, use a muscular foot to crawl along surfaces. Question 60:Which of the following statements about cnidarians is true? A) They have a complete digestive system.B) They possess stinging cells called nematocysts.C) They are exclusively terrestrial.D) They have a closed circulatory system. Answer: B) They possess stinging cells called nematocysts. Explanation: Cnidarians, such as jellyfish and corals, have specialized cells called nematocysts that they use for capturing prey and defense. Question 61:Which of the following is NOT a characteristic of birds? A) FeathersB) Hollow bonesC) Mammary glandsD) Beak Answer: C) Mammary glands Explanation: Birds do not have mammary glands; this is a characteristic specific to mammals. Question 62:Which type of symmetry do sea urchins exhibit? A) Bilateral symmetryB) Radial symmetryC) AsymmetryD) Pentaradial symmetry Answer: D) Pentaradial symmetry Explanation: Sea urchins exhibit pentaradial symmetry, meaning they have fivefold symmetry around a central axis. Question 63:Which of the following structures is primarily involved in locomotion in annelids? A) GillsB) TentaclesC) Segments and setaeD) Wings Answer: C) Segments and setae Explanation: Annelids use their segmented bodies and bristle-like structures called setae for locomotion through soil or water. Question 64:Which of the following animals is a representative of the phylum Arthropoda? A) SnailB) JellyfishC) SpiderD) Earthworm Answer: C) Spider Explanation: Spiders are arachnids, which are part of the phylum Arthropoda, characterized by their jointed legs and exoskeleton. Question 65:What type of body plan do echinoderms exhibit? A) AsymmetricalB) BilateralC) RadialD) Pentaradial Answer: D) Pentaradial Explanation: Adult echinoderms exhibit pentaradial symmetry, often with five arms or sections radiating from a central point. Question 66:Which of the following animals is a filter feeder? A) SharkB) ClamC) OwlD) Cheetah Answer: B) Clam Explanation: Clams are filter feeders that obtain their food by filtering water through their gills to capture particles. Question 67:What is the primary role of the notochord in chordates? A) ProtectionB) SupportC) RespirationD) Digestion Answer: B) Support Explanation: The notochord provides structural support during the development of chordates and eventually becomes part of the vertebral column in vertebrates. Question 68:Which type of animal is known for its ability to regenerate limbs? A) FishB) LizardC) StarfishD) Frog Answer: C) Starfish Explanation: Starfish have remarkable regenerative abilities, allowing them to regrow lost limbs. Question 69:Which of the following animals lays eggs? A) PlatypusB) KangarooC) ElephantD) Dolphin Answer: A) Platypus Explanation: The platypus is a monotreme, a type of mammal that lays eggs rather than giving birth to live young. Question 70:Which group of animals is characterized by having feathers, a beak, and laying hard-shelled eggs? A) MammalsB) ReptilesC) BirdsD) Amphibians Answer: C) Birds Explanation: Birds are characterized by feathers, a beak, and the ability to lay hard-shelled eggs, distinguishing them from other animal groups. Question 71:Which type of organism has a hard exoskeleton made primarily of chitin? A) MollusksB) AnnelidsC) ArthropodsD) Echinoderms Answer: C) Arthropods Explanation: Arthropods, such as insects and crustaceans, have an exoskeleton made of chitin, providing support and protection. Question 72:Which of the following animals is an endotherm? A) LizardB) FrogC) PenguinD) Shark Answer: C) Penguin Explanation: Penguins are endothermic (warm-blooded) birds that maintain a constant body temperature regardless of the environment. Question 73:Which of the following is a characteristic feature of amphibians? A) FeathersB) ScalesC) Moist skinD) Mammary glands Answer: C) Moist skin Explanation: Amphibians typically have moist skin that is important for respiration and hydration. Question 74:What type of reproduction do jellyfish typically undergo? A) Asexual reproductionB) Sexual reproductionC) Both asexual and sexual reproductionD) Budding Answer: C) Both asexual and sexual reproduction Explanation: Jellyfish can reproduce both sexually (producing eggs and sperm) and asexually (through budding in their polyp stage). Question 75:Which group of animals has a three-chambered heart? A) MammalsB) ReptilesC) BirdsD) Fish Answer: B) Reptiles Explanation: Most reptiles have a three-chambered heart, which consists of two atria and one ventricle, allowing for some mixing of oxygenated and deoxygenated blood. Question 76:What is the primary function of the gills in fish? A) DigestionB) CirculationC) RespirationD) Excretion Answer: C) Respiration Explanation: Gills are specialized organs in fish that extract oxygen from water for respiration. Question 77:Which of the following statements about sponges is true? A) They have a complex nervous system.B) They are primarily autotrophic.C) They lack true tissues.D) They have a circulatory system. Answer: C) They lack true tissues. Explanation: Sponges are simple organisms that lack true tissues and organs, functioning instead through a porous body structure. Question 78:Which of the following animals is known for having a large brain relative to body size? A) AntB) DolphinC) SnakeD) Goldfish Answer: B) Dolphin Explanation: Dolphins are known for their high intelligence and have a large brain-to-body ratio compared to many other animals. Question 79:Which of the following is a characteristic of all mammals? A) Laying eggsB) Hair or furC) External fertilizationD) Cold-blooded Answer: B) Hair or fur Explanation: All mammals possess hair or fur at some stage of their life cycle, which distinguishes them from other animal groups. Question 80:Which of the following animals undergoes metamorphosis? A) SharkB) CrabC) ButterflyD) Alligator Answer: C) Butterfly Explanation: Butterflies undergo complete metamorphosis, transforming from a larval stage (caterpillar) to a pupa (chrysalis) and finally to an adult. Question 81:Which of the following is a common characteristic of all chordates? A) Presence of scalesB) Presence of a notochordC) Mammary glandsD) Lungs Answer: B) Presence of a notochord Explanation: All chordates possess a notochord at some stage in their development, which serves as a supportive structure. Question 82:Which type of animal is characterized by having a tough outer cuticle? A) MollusksB) AnnelidsC) EchinodermsD) Arthropods Answer: D) Arthropods Explanation: Arthropods have a tough outer cuticle (exoskeleton) made of chitin, providing protection and support. Question 83:Which of the following animals is known for its ability to survive in extreme conditions, such as high radiation? A) TardigradeB) AntC) SharkD) Frog Answer: A) Tardigrade Explanation: Tardigrades, also known as water bears, are microscopic animals renowned for their resilience in extreme environments. Question 84:Which of the following groups has members that are primarily marine and exhibit filter feeding? A) AnnelidaB) MolluscaC) ArthropodaD) Echinodermata Answer: D) Echinodermata Explanation: Echinoderms, like sea stars and sea cucumbers, primarily live in marine environments and often filter feed on small particles. Question 85:What is the main purpose of the lateral line system in fish? A) DigestionB) Sensory perceptionC) RespirationD) Circulation Answer: B) Sensory perception Explanation: The lateral line system helps fish detect vibrations and changes in water pressure, aiding in navigation and prey detection. Question 86:Which of the following animals is known for having a unique feeding structure called a radula? A) SnailB) OctopusC) CrabD) Sea star Answer: A) Snail Explanation: Snails use a radula, a tongue-like organ with tiny teeth, to scrape food from surfaces. Question 87:What type of habitat do amphibians typically require for reproduction? A) TerrestrialB) AquaticC) Both A and BD) None of the above Answer: B) Aquatic Explanation: Amphibians typically lay their eggs in water, where the larvae (tadpoles) develop. Question 88:Which of the following is a characteristic of the phylum Porifera? A) Radial symmetryB) Presence of tissuesC) No true tissues or organsD) Complete digestive system Answer: C) No true tissues or organs Explanation: Sponges (Porifera) lack true tissues and organs, making them one of the simplest animal groups. Question 89:Which of the following animals can change color for communication or camouflage? A) SharkB) ChameleonC) DolphinD) Ant Answer: B) Chameleon Explanation: Chameleons have specialized cells in their skin that allow them to change color for communication and camouflage. Question 90:Which of the following is NOT a characteristic of mammals? A) Hair or furB) Laying eggsC) Warm-bloodedD) Mammary glands Answer: B) Laying eggs Explanation: While some mammals (monotremes) lay eggs, most mammals give birth to live young, which is a defining characteristic. Question 91:Which of the following animals has a segmented body and is known for burrowing? A) StarfishB) EarthwormC) SeahorseD) Clam Answer: B) Earthworm Explanation: Earthworms have a segmented body and are known for their burrowing habits in soil. Question 92:Which of the following is a characteristic feature of reptiles? A) Lungs and scalesB) Gills and finsC) Feathers and hollow bonesD) Fur and mammary glands Answer: A) Lungs and scales Explanation: Reptiles possess lungs for respiration and scales that help prevent water loss. Question 93:What is the primary role of the placenta in mammals? A) DigestionB) Gas exchangeC) Protection from predatorsD) Temperature regulation Answer: B) Gas exchange Explanation: The placenta facilitates gas exchange, nutrient transfer, and waste removal between the mother and developing fetus. Question 94:Which of the following is a method of asexual reproduction? A) BuddingB) FertilizationC) MetamorphosisD) Copulation Answer: A) Budding Explanation: Budding is a form of asexual reproduction where a new organism develops from an outgrowth or bud on the parent organism. Question 95:Which of the following organisms is classified as an amphibian? A) GeckoB) FrogC) SalamanderD) Both B and C Answer: D) Both B and C Explanation: Both frogs and salamanders are classified as amphibians, known for their life cycles that typically include both aquatic and terrestrial stages. Question 96:What is the primary function of the swim bladder in fish? A) DigestionB) Buoyancy controlC) RespirationD) Circulation Answer: B) Buoyancy control Explanation: The swim bladder allows fish to maintain buoyancy and stability at various depths in the water. Question 97:Which of the following groups of animals primarily consists of ectothermic species? A) BirdsB) MammalsC) ReptilesD) Both A and C Answer: C) Reptiles Explanation: Reptiles are primarily ectothermic, relying on environmental heat sources to regulate their body temperature. Question 98:Which of the following adaptations is primarily found in animals that live in desert environments? A) Webbed feetB) Thick furC) Water storage capabilitiesD) Gills Answer: C) Water storage capabilities Explanation: Animals adapted to desert environments often have mechanisms to store water or minimize water loss. Question 99:What is the primary function of feathers in birds? A) DigestionB) Insulation and flightC) RespirationD) Excretion Answer: B) Insulation and flight Explanation: Feathers provide insulation to maintain body temperature and are essential for flight in birds. Question 100:Which of the following is true about the animal kingdom? A) All animals are unicellular.B) All animals are autotrophic.C) All animals are heterotrophic.D) All animals reproduce asexually. Answer: C) All animals are heterotrophic. Explanation: All animals are heterotrophic, meaning they obtain their food by consuming other organisms

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