Diversity Among Animals Test 6

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MCQs 1:

Which organism among the following possesses an operculum?





Topic: Organism Physiology

Correct Answer: D) Sea horse

Detailed Hint:
  • The operculum is a feature found exclusively in bony fish. It serves as a protective cover for the gill slits, helping in respiration.
  • Among the options provided, sea horse is the only bony fish and thus, the only one possessing an operculum.
  • Consequently, the right answer is D, "Sea horse".

MCQs 2:

What type of cleavage is exhibited by deuterostomes?





Topic: Animal Development

Correct Answer: A) Radial

Detailed Hint:
  • The terms 'radial' and 'spiral' refer to the plane of cell divisions during early embryonic development.
  • Protostomes exhibit spiral and determinate cleavage, whereas deuterostomes characteristically exhibit radial and indeterminate cleavage.
  • Therefore, the correct answer is A, "Radial".

MCQs 3:

Which among the following is also referred to as tunicates?





Topic: Marine Biology

Correct Answer: B) Urochordate

Detailed Hint:
  • "Tunicates" is a common term used to describe Urochordates, which are notable for having a covering or "tunic" made from a unique substance closely related to cellulose.
  • The notochord, a defining feature of chordates, is present only during the larval stage in Urochordates.
  • Thus, the correct answer is B, "Urochordate".

MCQs 4:

What term is used to describe the occurrence of a single species in multiple morphological forms?







Topic: Genetics and Evolution

Correct Answer: B) Polymorphism

Detailed Hint:
  • Polymorphism refers to the occurrence of different forms or types in individuals among the same species.
  • It is a key aspect of evolution and biodiversity, allowing a species to adapt to different environments and survival conditions.
  • Consequently, the correct answer is B, "Polymorphism".

MCQs 5:

What is the mode of respiration in spiders?





Topic: Animal Physiology

Correct Answer: B) Book Lung

Detailed Hint:
  • Among arthropods, different classes employ different methods of respiration.
  • Insects typically use spiracles, crustaceans use gills, and spiders, which belong to the class Arachnida, primarily use structures called book lungs for respiration.
  • Therefore, the correct answer is B, "Book Lung".

MCQs 6:

Which of the following organisms is a pseudoceolomate?





Topic: Animal Kingdom

Correct Answer: D) None of these

Detailed Hint:
  • The terms coelomate, acoelomate, and pseudoceolomate refer to the types of body cavity or coelom in an organism.
  • Flatworms are typically acoelomates, roundworms are pseudoceolomates, and members of the Annelida phylum, such as earthworms, are coelomates.
  • None of the options provided in the question are pseudoceolomates, therefore, the correct answer is D, "None of these".

MCQs 7:

Modern reptiles are believed to have descended from dinosaurs of which period?





Topic: Paleontology

Correct Answer: C) Both A and B

Detailed Hint:
  • The history of evolution suggests that modern reptiles are descendants of dinosaurs, which thrived in both the Jurassic and Cretaceous periods.
  • These eras witnessed the evolution and diversification of several dinosaur species, many of which are believed to be the ancestors of present-day reptiles.
  • Hence, the correct answer is C, "Both A and B".

Question 8:

From what are animals believed to have evolved?







Topic: Evolutionary Biology

Correct Answer: D) Unicellular organism

Detailed Hints:
  • The theory of evolution posits that life on Earth evolved from simple, single-celled organisms.
  • These unicellular creatures, part of the kingdom Protoctista, are believed to be the ancestors of all complex life forms.
  • However, the specific group of Protoctista from which animals evolved is still a matter of scientific debate.
  • Thus, the correct answer is D, "Unicellular organism".

Question 9:

Which of the following animals possess a swim bladder?





Topic: Ichthyology

Correct Answer: D) None

Detailed Hints:
  • The swim bladder is an organ found in many fish, allowing them to control their buoyancy in the water.
  • Neither sharks, which are classified as cartilaginous fish, nor lampreys, which are jawless fish, possess a swim bladder.
  • The swim bladder is typically found only in bony fish.
  • Therefore, the correct answer is D, "None".

Question 10:

To which order does a deer belong?





Topic: Mammalogy

Correct Answer: B) Artiodactyla

Detailed Hints:
  • Biological classification is important for understanding the relationships and characteristics of different organisms.
  • Deer belong to the order Artiodactyla, which is characterized by even-toed ungulates, including cows, goats, and deer.
  • Therefore, the correct answer is B, "Artiodactyla".

Question 11:

Which of the following classes features a fully developed digestive system?





Topic: Invertebrate Zoology

Correct Answer: A) Turbellaria

Detailed Hints:
  • The level of development of the digestive system in invertebrates varies according to the species' lifestyle.
  • Turbellaria, a class of free-living flatworms, features a well-developed digestive system.
  • In contrast, parasitic species such as Trematoda (liver flukes) and Cestoda (tapeworms) exhibit a poorly developed or absent digestive system.
  • Therefore, the correct answer is A, "Turbellaria".

Question 12:

Identify the freshwater sponge among the following:





Topic: Porifera

Correct Answer: B) Spongilla

Detailed Hints:
  • The Porifera phylum consists of sponges, which can be found in both marine and freshwater environments.
  • Venus flower basket, Sycon, and Leucosolenia are all examples of marine sponges.
  • Spongilla, on the other hand, is a known freshwater sponge.
  • Consequently, the correct answer is B, "Spongilla".

Question 13:

Which of the following organisms exhibit metamerism?





Topic: Animal Biology

Correct Answer: B) Earthworm

Detailed Hints:
  • Metamerism is a biological phenomenon of having a linear series of body segments fundamentally similar in structure.
  • Among the options provided, only earthworms, which belong to the Annelida phylum, display true metamerism.
  • Snakes and pinworms do not exhibit this characteristic.
  • Hence, the correct answer is B, "Earthworm".

Question 14:

How many species are included in the Platyhelminthes phylum?





Topic: Parasitology

Correct Answer: B) 15,000

Detailed Hints:
  • Platyhelminthes, also known as flatworms, encompass a diverse group of organisms.
  • These creatures vary greatly in size, from the rather minute Planaria at approximately 10mm to the significantly larger tapeworm at 16 feet or 5 meters.
  • Current estimates suggest that the Platyhelminthes phylum has about 15,000 different species.
  • Thus, the correct answer is B, "15,000".

Question 15:

In sponges, which type of cells are responsible for the production of gametes?





Topic: Porifera Biology

Correct Answer: C) Amoebocytes

Detailed Hints:
  • Sponges, belonging to the phylum Porifera, have various types of cells performing different functions.
  • Among all cell types, the Amoebocytes play a critical role in reproductive processes, being responsible for gamete production.
  • Pinacoderm, Choanoderm, and Porocytes are involved in other functions but not in gamete production.
  • Therefore, the correct answer is C, "Amoebocytes".

Question 16:

The term "molluscus" originates from which language?





Topic: Etymology

Correct Answer: A) Latin

Detailed Hints:
  • The study of the origin of words, or etymology, is often insightful in understanding biological terms and classifications.
  • The term "molluscus" is derived from the Latin language and signifies 'soft'.
  • In biological taxonomy, this term is used as the basis for the name of the Mollusca phylum, whose members generally possess soft bodies often protected by calcareous shells.
  • Hence, the correct answer is A, "Latin".

Question 17:

A flatworm was sectioned into three segments for a research study and placed in a nutrient-rich environment. All sections evolved into individual worms. Identify the possible species of this worm:







Topic: Regenerative Biology

Correct Answer: C) Planaria

Detailed Hints:
  • The process of regeneration, wherein an organism develops anew from a fragment, is best exhibited by flatworms.
  • Specifically, Planaria, a type of flatworm, demonstrates exceptional regenerative abilities; when split into parts, each piece can grow into a new worm.
  • On the other hand, the other options, including Liver Fluke, Tapeworm, and Hydra, do not share this characteristic to the same extent.
  • Hence, the correct answer is C, "Planaria".

Question 18:

In which organism can you find a nematocyst?





Topic: Cnidarian Biology

Correct Answer: C) Jellyfishes

Detailed Hints:
  • The nematocyst is a specialized cell found in certain aquatic organisms known as cnidarians, which includes jellyfish.
  • Annelids and Nematodes, on the other hand, do not possess this specialized cell.
  • Therefore, the organism that possesses the nematocyst amongst the choices provided is the Jellyfish.
  • Consequently, the correct answer is C, "Jellyfishes".

Question 19:

Which is the organ of excretion in annelids?







Topic: Annelid Anatomy

Correct Answer: B) Nephridia

Detailed Hints:
  • Different organisms possess unique excretory systems to expel waste materials from their bodies.
  • In the case of Annelids, Nephridia serve as the principal organ of excretion.
  • Other options like Flame cells in Platyhelminthes, Malpighian tubules in insects, Kidneys in Molluscs, and Green glands in arachnids and crustaceans are excretory organs, but not in Annelids.
  • Thus, the correct answer is B, "Nephridia".

Question 20:

How many oxygen molecules can three molecules of haemocyanin carry?





Topic: Respiratory Pigments

Correct Answer: D) None

Detailed Hint:
  • Haemocyanin is a respiratory pigment found in some invertebrates, notably molluscs and arthropods.
  • Unlike haemoglobin, which carries oxygen in vertebrates, haemocyanin carries oxygen in a different way.
  • Notably, three molecules of haemocyanin do not correlate to carrying a specific number of oxygen molecules as suggested in options A, B, and C.
  • Hence, the correct answer is D, "None".

Question 21:

Which of the following possesses a swim bladder?





Topic: Fish Anatomy

Correct Answer: C) Bony fish

Detailed Hint:
  • A swim bladder is an internal gas-filled organ that contributes to buoyancy in fish.
  • Among the options, only bony fish, not cyclostomes or cartilaginous fish, have a swim bladder.
  • Therefore, the correct answer is C, "Bony fish".

Question 22:

In which of the following organisms would you find the locomotory organ known as parapodia?





Topic: Comparative Anatomy

Correct Answer: B) Neries

Detailed Hint:
  • Different organisms have developed unique locomotory organs for movement.
  • Among the options, Neries, a type of polychaete annelid, uses parapodia for locomotion.
  • Meanwhile, earthworms use setae or chetae, and leeches use two hooks for movement.
  • Consequently, the correct answer is B, "Neries".

Question 23:

Which of the following is recognized as protochordates?





Topic: Animal Diversity and Evolution

Correct Answer: D) Acraniata

Detailed Hint:
  • Protochordates are a group of animals that are considered to be precursors to chordates.
  • Among the options, Echinoderms, Hemichordates, and Urochordates are not classified as protochordates.
  • Acraniata, however, is a term often used to refer to protochordates, which includes lower chordates without a distinct brain or cranium.
  • Thus, the correct answer is D, "Acraniata".

Question 24:

In which of the following is the operculum missing?





Topic: Comparative Anatomy

Correct Answer: D) Both A and B

Detailed Hint:
  • The operculum is a structure that covers the gills in some species of fish.
  • Bony fish possess an operculum, but it is absent in both Cyclostomes and Cartilaginous fish.
  • Therefore, the correct answer is D, "Both A and B".

Question 25:

An observed marine animal exhibiting no tissue organization likely belongs to which phylum?







Topic: Animal Tissue Organization

Correct Answer: A) Porifera

Detailed Hint:
  • The presence or absence of tissue organization helps in classifying animals into different phyla.
  • Of the options listed, Porifera, also known as sponges, are unique in that they do not exhibit tissue organization.
  • Coelentrata, Echinodermata, and Hemichordates, on the other hand, do possess tissue organization.
  • Consequently, the correct answer is A, "Porifera".

Question 26:

Which organism among the following is sedentary as an adult but active during its larval stage?





Topic: Life Cycle Stages

Correct Answer: D) Sponges

Detailed Hint:
  • Different organisms exhibit varying levels of mobility across their life stages.
  • Among the given options, the adult sponges, belonging to the phylum Porifera, are sessile or sedentary, while their larvae are mobile and free-swimming.
  • Therefore, the correct answer is D, "Sponges".

Question 27:

In cnidarians, the zygote develops into which type of larva?





Topic: Developmental Biology

Correct Answer: C) Planula

Detailed Hint:
  • The development of various organisms involves different stages and types of larvae.
  • The organisms belonging to the phylum Cnidaria, such as jellyfish and sea anemones, produce a larval stage known as Planula.
  • Hence, the correct answer is C, "Planula".
  • Radial symmetry is found in cnidarians.

Question 28:

What can be said about the sea anemone?





Topic: Animal Symmetry

Correct Answer: A) It is radially symmetrical

Detailed Hint:
  • The sea anemone, a member of the phylum Cnidaria, exhibits a specific type of body symmetry.
  • Unlike protostomes or coelomates, sea anemones are characterized by radial symmetry, where any slice passing through the organism's central axis divides it into mirrored halves.
  • Therefore, the correct answer is A, "It is radially symmetrical".

MCQ 29:

Which among the following organisms is primarily sessile?





Topic: Animal Mobility

Correct Answer: A) Obelia

Detailed Hint:
  • The mobility of organisms varies greatly and is often determined by their species and life stage.
  • Obelia, a marine hydrozoan of the class Hydrozoa, is predominantly sessile, forming fixed colonies.
  • The Portuguese man of war, although it appears to be stationary, is not truly sessile as it is free-floating.
  • Therefore, the correct answer is A, "Obelia".

MCQ 30:

Which of the following animals does not have a placenta?





Topic: Animal Reproduction

Correct Answer: C) South-American anteater

Detailed Hint:
  • The placenta is a specialized reproductive organ that occurs in certain mammals, facilitating the exchange of nutrients and waste between the mother and fetus.
  • Among the options given, the South-American anteater does not have a placenta. Whereas, Koalas have a poorly developed placenta, and Pangolins and Moles possess a functional one.
  • Hence, the correct answer is C, "South-American anteater".

MCQ 31:

In which of the following groups of vertebrates is a placenta formed?







Topic: Vertebrate Reproduction

Correct Answer: E) Mammals

Detailed Hint:
  • The placenta is a specialized reproductive organ found in certain groups of vertebrates.
  • Among the options provided, placental formation is characteristic of mammals, enabling the nourishment of the young within the womb.
  • It is absent in fishes, amphibians, reptiles, and birds.
  • Consequently, the correct answer is E, "Mammals".

MCQ 32:

Which of the following organisms have a glochidium larva?





Topic: Animal Development

Correct Answer: D) None of the above

Detailed Hint:
  • The development of organisms often involves distinct larval stages.
  • The Glochidium larva is a stage in the life cycle of certain bivalve mollusks, which is not related to any of the organisms provided in the options.
  • Therefore, the correct answer is D, "None of the above".
  • The Trochophore larva is from the Phylum Annelida.
  • The Glochidium larva is found in the Phylum Mollusca.
  • The Bipannaria larva is associated with the Phylum Echinodermata.
  • The Tornaria larva is a member of the Subphylum Hemichordata.
  • The Tadpole larva is characteristic of frogs.

MCQ 33:

Where can you find a pinworm in the human body?





Topic: Human Parasites

Correct Answer: B) Large intestine

Detailed Hint:
  • Pinworms, also known as Enterobius vermicularis, are human intestinal parasites.
  • They predominantly inhabit the large intestine, causing symptoms such as severe anal itching and inflammation of the colon's mucous membrane.
  • Thus, the correct answer is B, "Large intestine".

MCQ 34:

In nematodes, how is the body cavity formed?





Topic: Nematode Anatomy

Correct Answer: A) From the Blastocoel

Detailed Hint:
  • The process of body cavity formation or Coelom formation occurs differently in various groups of animals.
  • In nematodes, the body cavity is derived from the blastocoel, which is the cavity of the blastula during early embryonic development.
  • Hence, the correct answer is A, "From the Blastocoel".

MCQ 35:

Which of the following creatures possesses a right aortic arch?





Topic: Comparative Anatomy

Correct Answer: A) Penguin

Detailed Hint:
  • The aortic arch, a vital component of the circulatory system, may differ in its positioning across animal species.
  • Penguins, unique among birds, exhibit a right aortic arch.
  • Pangolins and sea lions, contrary to the options provided, do not have a right aortic arch.
  • Consequently, the correct answer is A, "Penguin".

Question 36:

Which group acts as a linkage between reptiles and mammals?





Topic: Evolutionary Biology

Correct Answer: C) Monotremes

Detailed Hints:
  • Evolutionary biology studies the descent of different groups of organisms and their relationships.
  • Monotremes, a unique group of mammals that lay eggs, serve as a connecting link between reptiles and mammals.
  • Marsupials, Eutharians, and Metatherians, although mammals, do not exhibit this link as explicitly as Monotremes.
  • Hence, the correct answer is C, "Monotremes".

Question 37:

In which of the following groups would you find a mantle membrane?





Topic: Invertebrate Anatomy

Correct Answer: C) Mulluscs

Detailed Hints:
  • The mantle is a significant feature found in certain groups of invertebrates.
  • In Molluscs, the mantle is a specialized tissue that secretes the shell.
  • This trait is not seen in Platyhelmenthes, Hemichordates, or Annalids.
  • Therefore, the correct answer is C, "Mulluscs".

Question 38:

In which group of organisms would you find book lungs?





Topic: Animal Respiration

Correct Answer: C) Arachnids

Detailed Hints:
  • Different groups of organisms have developed unique respiratory structures adapted to their environment.
  • Book lungs are unique respiratory structures found in Arachnids, a group that includes spiders and scorpions. They are named for their resemblance to a book's pages.
  • Although Insects and Crustaceans are also arthropods, they do not possess book lungs. Insects typically breathe through a network of tubes called trachea, while Crustaceans usually rely on gills for respiration.
  • Therefore, the correct answer is C, "Arachnids".

Question 39:

Which one of these sponges is a freshwater species?





Topic: Marine Biology

Correct Answer: D) Spongilla

Detailed Hints:
  • Sponges, or Porifera, are simple multicellular organisms found in marine and freshwater environments.
  • While Sycon, Leucoselenia, and Euplectella are marine species, Spongilla is known for being a freshwater sponge.
  • Thus the correct answer is D, "Spongilla".

Question 40:

During the metagenesis phase in jellyfish, which form is produced asexually?





Topic: Marine Life-Cycle

Correct Answer: A) Medusa

Detailed Hints:
  • Metagenesis, or alternation of generations, is a life cycle that alternates between a sexually reproducing generation and an asexual one.
  • In jellyfish, this cycle manifests itself in the form of polyps (sessile phase) and medusae (free-floating phase).
  • The polyps reproduce asexually to produce medusae.
  • Therefore, the correct answer is A, "Medusa".

Question 41:

Which of the following organisms undergoes incomplete metamorphosis?





Topic: Animal Development

Correct Answer: D) None of the above

Detailed Hints:
  • Metamorphosis is a biological process that involves a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation.
  • Incomplete metamorphosis, observed in certain insects, involves an immature form (nymph) that gradually develops into the adult without a pupal stage.
  • Options A, B, and C, namely Acorn worm, Leech, and Sea cucumber, undergo complete metamorphosis, not incomplete.
  • Consequently, the correct answer is D, "None of these".

Question 42:

What is the length of a female Ascaris lumbricoides?





Topic: Parasitology

Correct Answer: B) 8-16 inches

Detailed Hints:
  • Ascaris lumbricoides, a species of roundworm, is known for its significant size difference between males and females.
  • Female Ascaris lumbricoides are known to be larger than males, typically ranging between 8 to 16 inches in length.
  • Therefore, the correct answer is B, "8-16 inches".

Question 43:

Which of the following is an example of an acoelomate?





Topic: Invertebrate Zoology

Correct Answer: D) Tapeworm

Detailed Hints:
  • Acoelomates are animals that lack a body cavity, or coelom.
  • Among the options provided, Tapeworms are a type of flatworm, which are known acoelomates.
  • Pinworm and Acorn worm are not acoelomates, while Earthworm is a type of worm with a coelom (coelomates).
  • Therefore, the correct answer is D, "Tapeworm".

Question 44:

In which geological period did amphibians become dominant?





Topic: Paleozoology

Correct Answer: C) Devonian

Detailed Hints:
  • Geological time periods mark significant changes in Earth's history, often characterized by the emergence or dominance of certain groups of organisms.
  • Amphibians, one of the earliest tetrapods, first appeared in the fossil record during the Devonian period, often referred to as the "Age of Fishes".
  • Despite the presence of amphibians in later periods like Triassic, Jurassic, and Cenozoic, their dominance is attributed to the Devonian period.
  • Therefore, the correct answer is C, "Devonian".

Question 45:

Which organism exhibits radial symmetry as an adult and bilateral symmetry at its larval stage?





Topic: Animal Symmetry

Correct Answer: C) Star fish

Detailed Hints:
  • Symmetry in biology is the balanced distribution of duplicate body parts or shapes.
  • Starfish, or sea stars, are unique echinoderms that exhibit bilateral symmetry during their larval stage and evolve into a radially symmetrical form in adulthood.
  • Though Jellyfish exhibit radial symmetry, they do not transition from bilateral symmetry at any stage. Cuttlefish and Silverfish maintain bilateral symmetry throughout their life.
  • Hence, the correct answer is C, "Star fish".

Question 46:

Three pairs of orange-colored ganglia are found in which group?





Topic: Zoological Anatomy

Correct Answer: C) Molluscs

Detailed Hints:
  • Ganglia are structures in invertebrates, analogous to the brains of vertebrates, containing a concentration of nerve cells.
  • In the phylum Mollusca, the nervous system typically consists of three pairs of orange-colored ganglia.
  • These ganglia are interconnected by nerve cords and give rise to nerves that innervate different organs.
  • Therefore, the correct answer is C, "Molluscs".

Question 47:

Where can the ambulacral groove be located?





Topic: Comparative Anatomy

Correct Answer: A) Sea star

Detailed Hints:
  • The ambulacral groove is a characteristic feature of certain marine organisms, serving as a pathway for the tube feet, which facilitate locomotion.
  • Among the provided options, the Sea star, a member of the echinoderms, possesses an ambulacral groove.
  • Squids and Slugs do not have an ambulacral groove.
  • Therefore, the correct answer is A, "Sea star".

Question 48:

Which of the following organisms resides in the small intestine?





Topic: Parasitology

Correct Answer: B) Ascaris

Detailed Hints:
  • The small intestine is a common site for parasitic infections in many animals.
  • Among the options provided, Ascaris lumbricoides, a type of roundworm, is found in the small intestine.
  • Pinworm usually resides in the large intestine, while Earthworms and Acorn worms are not intestinal parasites.
  • Hence, the correct answer is B, "Ascaris".

Question 49:

The worms of which phylum are primarily characterized by whipping movements?





Topic: Animal Behavior

Correct Answer: B) Nematoda

Detailed Hints:
  • Different groups of worms exhibit distinct locomotion patterns, which depend on their body structure and muscle arrangement.
  • Nematodes, or roundworms, have a characteristic whipping movement due to their longitudinal muscle bands. They lack circular muscles.
  • Worms from other phyla like Platyhelminthes, Annelida, and Hemichordata, do not primarily exhibit whipping movements.
  • Thus, the correct answer is B, "Nematoda".

MCQs 50:

What serves as the primary organ of locomotion in an earthworm?





Topic: Zoological Anatomy

Correct Answer: B) Setae1

Detailed Hint:
  • Locomotion in various invertebrate organisms is facilitated by different specialized structures.
  • In the case of an earthworm, which belongs to the phylum Annelida, tiny bristle-like structures called setae or chetae aid in its movement.
  • Parapodia are locomotory structures found in certain polychaete worms, not in earthworms. Cilia are not present in earthworms.
  • Therefore, the correct answer is B, "Setae".

MCQs 51:

In which organism can metagenesis be observed?





Topic: Life Cycles

Correct Answer: B) Obelia2

Detailed Hint:
  • The term "metagenesis" refers to the alternation of generations, a pattern of reproduction occurring in certain species.
  • In the context of the given options, Obelia, a type of cnidarian, exhibits metagenesis.
  • While Hydra possess two body forms, they do not follow a strict alternation of generations. Sea Urchins do not possess metagenesis.
  • Hence, the correct answer is B, "Obelia".

MCQs 52:

Which of the following organisms exhibits metamerical segmentation?





Topic: Comparative Anatomy

Correct Answer: A) Earthworm

Detailed Hint:
  • Metamerical segmentation, also known as serial segmentation, refers to a body plan where internal and external structures repeat in a series of segments.
  • While both earthworms and cockroaches show segmentation, only earthworms (Annelida) display true metamerical segmentation.
  • Cockroaches (Arthropoda) exhibit a type of segmentation, but it does not qualify as metamerical.
  • Therefore, the correct answer is A, "Earthworm".

MCQs 53:

The mouth of an echinoderm is located on which side?





Topic: Comparative Anatomy

Correct Answer: B) Ventral Side

Detailed Hint:
  • The positioning of anatomical structures varies across different phyla in the animal kingdom.
  • Echinoderms, which include starfish and sea urchins, have a unique body plan. Their mouth is located on the ventral (or lower) side.
  • The options "Dorsal Side" and "Abaral Side" are incorrect as the mouth of echinoderms is not positioned there.
  • Therefore, the correct answer is B, "Ventral Side".
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