Diversity Among Animals Test 8

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Question 1:

What is the number of ganglia in the head of Planaria?





Topic: Nervous System in Flatworms

Correct Answer: A) One

Detailed Hint:
  • Flatworms such as Planaria possess a simple nervous system, characterized by a pair of anterior cerebral ganglia and a ventral ganglia connected by a nerve ring and via one or three nerve cords.
  • The term "ganglia" refers to a collection of nerve cells. In the context of the question, we're specifically discussing the head of Planaria.
  • Understanding this, we can discern that there is one ganglion in the head of Planaria.
  • Therefore, the correct answer is A, "One".

Question 2:

What is the term for the outer layer of a sponge's body?





Topic: Anatomy of Sponges

Correct Answer: A) Pinacoderm

Detailed Hint:
  • The sponge's body is composed of several layers, each with a distinct function.
  • The outermost layer, referred to as the "Pinacoderm," is made up of flattened cells known as pinacocytes.
  • Therefore, the correct answer is A, "Pinacoderm".

Question 3:

What are the small pores present on the surface of all parazoans known as?





Topic: Anatomy of Parazoans

Correct Answer: B) Ostia

Detailed Hint:
  • Parazoans, such as those in the phylum Porifera, have small holes or pores all over their bodies.
  • These pores, key to their feeding and water filtration system, are termed "Ostia."
  • Therefore, the correct answer is B, "Ostia".

Question 4:

What is the term for the excretory pore of Flame cells?





Topic: Excretory System in Protosomes

Correct Answer: A) Nephridiopore

Detailed Hint:
  • Flame cells, specialized cells in certain invertebrates, play a vital role in the excretion process.
  • The pore through which waste products are excreted from these cells is called a "Nephridiopore."
  • Therefore, the correct answer is A, "Nephridiopore".

Question 5:

Which of these organisms lacks a digestive system?





Topic: Digestive System in Different Organisms

Correct Answer: D) Tape worm

Detailed Hint:
  • Various organisms have diverse adaptation strategies. In the case of digestive systems, some organisms develop complex ones, while others may have poorly developed or even no digestive systems.
  • For instance, free-living forms like Planaria and Dugestia have developed digestive systems.
  • Parasitic forms, such as the liver fluke (Class Trematoda) have poorly developed systems, and tapeworms (Class Cestode), interestingly, completely lack a digestive system.
  • Therefore, the correct answer is D, "Tape worm".

Question 6:

Which of the following is a characteristic of cnidarians?





Topic: Features of Cnidarians

Correct Answer: D) All of these

Detailed Hint:
  • Cnidarians, a group of aquatic invertebrates, exhibit several unique characteristics.
  • They possess a coelenteron, which is a central body cavity that functions in digestion, among other things.
  • Cnidocytes are specialized cells that these organisms have for defense and prey capture.
  • Mesogloea is a non-cellular layer that resides between the outer and inner cell layers of cnidarians.
  • Therefore, the correct answer is D, "All of these".

Question 7:

How does asexual reproduction occur in coelenterates?





Topic: Reproduction in Coelenterates

Correct Answer: D) All of these

Detailed Hint:
  • Coelenterates are capable of reproducing through various asexual methods.
  • These include budding, where new individuals sprout from the parent organism, and regeneration, where new organisms form from fragments of the parent.
  • Rarely, they can also reproduce via fragmentation, where the organism breaks into fragments and each fragment develops into a new individual.
  • Therefore, the correct answer is D, "All of these".

Question 8:

What is the largest mass that makes up coral reefs?





Topic: Composition of Coral Reefs

Correct Answer: D) Calcium carbonate

Detailed Hint:
  • Coral reefs are significant marine structures that are predominantly made up of a specific compound.
  • This compound is not calcium phosphate, zinc sulphate, or sodium hydroxide.
  • It is, in fact, calcium carbonate, which forms the hard, exoskeleton of coral polyps.
  • Therefore, the correct answer is D, "Calcium carbonate".

Question 9:

What type of larva is coelenterate known for having?





Topic: Life Cycle of Coelenterates

Correct Answer: A) Planula

Detailed Hint:
  • Coelenterates are characterized by a distinctive motile larval stage in their life cycle.
  • It is not the gastrula or blastula stage, which are other forms of larval stages in different organisms.
  • The unique larval stage for coelenterates is the planula stage.
  • Therefore, the correct answer is A, "Planula".

Question 10:

What term best describes the body cavity of the phylum Porifera?





Topic: Porifera Anatomy

Correct Answer: A) Spongocoel

Detailed Hint:
  • Organisms in the phylum Porifera have a unique term for their body cavity.
  • It is not referred to as an enteron/gastrovascular cavity, haemocoel, or as having no body cavity.
  • The body cavity of a sponge is called the spongocoel.
  • Therefore, the correct answer is A, "Spongocoel".

Question 11:

Which statement accurately describes the Platyhelminthes?





Topic: Characteristics of Platyhelminthes

Correct Answer: D) All of the above

Detailed Hint:
  • Platyhelminthes, or flatworms, exhibit certain body characteristics.
  • Their bodies are unsegmented, meaning they do not have repeated sections.
  • They may appear superficially segmented but lack true segmentation.
  • Therefore, the correct answer is D, "All of the above".

Question 12:

Which of the following is not characteristic of protostomes?





Topic: Characteristics of Protostomes

Correct Answer: C) Radial cleavage

Detailed Hint:
  • Protostomes, a large group of coelomate animals, exhibit specific traits.
  • They have a determinate fate and bilateral symmetry, and their development often involves a trochophore larva stage.
  • However, they do not undergo radial cleavage, which is characteristic of deuterostomes.
  • Therefore, the correct answer is C, "Radial cleavage".

Question 13:

Which of the following does not illustrate polymorphism?





Topic: Polymorphism in Organisms

Correct Answer: C) Corals

Detailed Hint:
  • Polymorphism is a phenomenon where an organism or species exists in different forms or 'morphs'.
  • Zooids, siphonophora, and dactylozooids are examples of organisms showing polymorphism.
  • However, Corals do not exemplify polymorphism, even though they display a variety of forms, their differences are not due to polymorphism.
  • Therefore, the correct answer is C, "Corals".

Question 14:

Which class shows the ability of regeneration?





Topic: Regeneration Capacity in Different Classes

Correct Answer: B) Turbellaria

Detailed Hint:
  • Regeneration is a unique biological feature where an organism can restore lost parts of its body.
  • Among the options provided, Cestoda and Trematoda, which include parasitic organisms like tapeworms and liver flukes respectively, do not exhibit this feature.
  • However, Turbellaria, exemplified by planaria, displays a remarkable capacity for regeneration.
  • Therefore, the correct answer is B, "Turbellaria".

Question 15:

What is the mode of nutrition in coelenterates?





Topic: Nutrition in Coelenterates

Correct Answer: B) Carnivorous

Detailed Hint:
  • Coelenterates, which include marine organisms like jellyfishes and sea anemones, follow a specific nutritional pattern.
  • They are neither herbivorous, omnivorous, or detritivorous, meaning they don't feed on plants, both plants and meat, or detritus respectively.
  • Instead, coelenterates are carnivorous, feeding on small fish, insects, and crustaceans.
  • Therefore, the correct answer is B, "Carnivorous".

Question 16:

In which phylum does the larval stage exhibit free movement while the adult is sessile?





Topic: Life Cycle Characteristics of Different Phyla

Correct Answer: A) Porifera

Detailed Hint:
  • Different phyla of animals show varied life stages and mobility characteristics.
  • In the case of Porifera, Urochordate, Cephalochordate, and Platyhelminthes, it's unique to Porifera, or sponges, that their larvae are motile while adults are sessile.
  • Sponges are stationary as adults, but their larvae are free-swimming.
  • Therefore, the correct answer is A, "Porifera".

Question 17:

Which of the following organisms does not belong in the Radiata group?





Topic: Classification of Organisms

Correct Answer: C) Planaria

Detailed Hint:
  • The Radiata grade includes certain coelenterates.
  • This group encompasses various marine species like the hydra, Physalia Pelagica, jellyfish, and obelia.
  • However, Planaria, which is a flatworm, displays bilateral symmetry and does not fit the Radiata classification.
  • Therefore, the correct answer is C, "Planaria".

Question 18:

Which statement is inaccurate about the pseudocoelom?





Topic: Understanding Pseudocoeloms

Correct Answer: C) Is formed from the archenteron

Detailed Hint:
  • A pseudocoelom originates directly from the blastocoel, not the archenteron of the gastrula.
  • It does not have a direct relationship with either the reproductive or the excretory systems.
  • Hence, the statement that it is formed from the archenteron is false.

Question 19:

Which phylum belongs to the Radiata grade?





Topic: Animal Classification and Grades

Correct Answer: B) Coelenterata

Detailed Hint:
  • The Radiata grade only includes one phylum—Coelenterata.
  • Porifera, Platyhelminthes, and Aschelminthes do not belong to this grade.
  • Thus, the only phylum in the options that fits the Radiata classification is Coelenterata.

Question 20:

Identify the organism that is not classified as a sponge:





Topic: Classification of Marine Organisms

Correct Answer: A) Corals

Detailed Hint:
  • Sponges are unique marine organisms with a porous structure.
  • Among the options provided, Spongila, Euplectella, and Sycon are examples of sponges.
  • However, corals do not fall into the sponge category and are instead classified as cnidarians.

Question 21:

Which of the following statements correctly describes the characteristics of Platyhelminthes?





Topic: Characteristics of Platyhelminthes

Correct Answer: D) All of the above

Detailed Hint:
  • Platyhelminthes, or flatworms, possess several distinct features.
  • They demonstrate bilateral symmetry, are referred to as flat worms due to their body structure, and exhibit triploblastic organization.
  • Therefore, all of the given options accurately represent characteristics of Platyhelminthes.

MCQs 22:

The excretory system of planaria is characterized by what form?





Topic: Excretory System in Planaria

Correct Answer: D) All of these

Detailed Hints:
  • Planaria's excretory system demonstrates a remarkable variety.
  • It consists of flame cells, also known as protonephridia or solenocytes.
  • Thus, all options given correctly describe the components of Planaria's excretory system.
  • Hence, the correct answer is D, "All of these".

MCQs 23:

Which of the following options is not classified as a protostome?





Topic: Understanding Protostomes

Correct Answer: C) Starfish

Detailed Hints:
  • Protostomes are a major group of animals and include types such as mollusks, annelids, and arthropods.
  • Starfish, on the other hand, do not belong to the protostome group; they fall under the category of deuterostomes.
  • Therefore, the only option that is not a protostome is the starfish.
  • Consequently, the correct answer is C, "Starfish".

MCQs 24:

What term is used to describe the alternation of generations in cnidarians?





Topic: Life Cycles of Cnidarians

Correct Answer: B) Metagenesis

Detailed Hints:
  • In the lifecycle of cnidarians, the alternation of generations—a process where two or more different forms of individuals occur in the same lifecycle—is known as metagenesis.
  • Zooids and polymorphism refer to other biological phenomena and are not terms used for the alternation of generations in cnidarians.
  • Hence, the term that accurately describes this process in cnidarians is metagenesis.
  • Therefore, the correct answer is B, "Metagenesis".

MCQs 25:

What term is used to refer to an individual in a polymorphic colony?





Topic: Understanding Polymorphic Colonies

Correct Answer: B) Zooid

Detailed Hints:
  • A polymorphic colony consists of various types of individuals, each performing a specific role.
  • These individuals are known as zooids.
  • Sycon, polyps, and gonotheca are terms related to different biological phenomena and do not refer to individuals in a polymorphic colony.
  • Thus, the correct term for an individual in a polymorphic colony is a zooid.
  • Consequently, the correct answer is B, "Zooid".

MCQs 26:

Which of the following is classified as a deuterostome?





Topic: Classification of Deuterostomes

Correct Answer: A) Lion

Detailed Hint:
  • Deuterostomes encompass several types of animals, including lions.
  • Sycon, Hydra, and Leech do not belong to deuterostomes; they belong to different biological classes.
  • Therefore, the only deuterostome in the provided options is the lion.
  • Consequently, the correct answer is A, "Lion".

MCQs 27:

In which of the following organisms does the centralized nervous system first appear?





Topic: Evolution of the Central Nervous System

Correct Answer: A) Planaria

Detailed Hints:
  • The centralized nervous system is an evolutionary trait that first appeared in Planaria.
  • While Hydra, Leech, and Sycon have nervous systems, they do not feature a centralized system.
  • Therefore, Planaria is the correct answer.
  • Hence, the correct answer is A, "Planaria".

MCQs 28:

Which Platyhelminthes species possesses cilia?





Topic: Characteristics of Platyhelminthes

Correct Answer: A) Planaria

Detailed Hint:
  • Among Platyhelminthes, Planaria is known to have cilia.
  • Cestodes, Trematodes, and Tape worms, while also being Platyhelminthes, do not have cilia.
  • Therefore, the Platyhelminthes species that possesses cilia is Planaria.
  • Consequently, the correct answer is A, "Planaria".

Question 29:

Identify the statement that does not apply to deuterostomes.





Topic: Understanding Deuterostomes

Correct Answer: A) Spiral cleavage

Detailed Hints:
  • Deuterostomes are characterized by several unique traits.
  • These include an indeterminate fate, a glochidium stage, and a dorsal nervous system.
  • However, deuterostomes do not undergo spiral cleavage; this is a characteristic of protostomes.
  • Hence, the statement that does not apply to deuterostomes is spiral cleavage.
  • Therefore, the correct answer is A, "Spiral cleavage".

Question 30:

What category does Planaria fall under?





Topic: Classification of Planaria

Correct Answer: A) Acoelomate

Detailed Hints:
  • Planaria is a type of flatworm, belonging to the phylum Platyhelminthes.
  • Animals in this phylum are categorized as acoelomates, which means they lack a coelom (a fluid-filled body cavity).
  • Planaria is not a pseudo coelomate, a coelomate, or a protostome.
  • Thus, the correct categorization for Planaria is acoelomate.
  • Consequently, the correct answer is A, "Acoelomate".

Question 31:

From what does the pseudocoelom, a fluid-filled cavity, develop?





Topic: Developmental Biology

Correct Answer: A) Blastocoel

Detailed Hints:
  • A pseudocoelom is a type of body cavity that develops from a specific part of an embryo.
  • This cavity does not originate from the mesoderm, archenteron, or ectoderm.
  • Instead, the pseudocoelom develops from the blastocoel, which is the cavity of the blastula stage of an embryo.
  • Consequently, the pseudocoelom develops from the blastocoel.
  • Therefore, the correct answer is A, "Blastocoel".

Question 32:

Which assertion is incorrect about Nematodes?





Topic: Characteristics of Nematodes

Correct Answer: D) Coelomates

Detailed Hints:
  • Nematodes, also known as roundworms, possess several distinct characteristics.
  • They are non-segmented and display bilateral symmetry, conforming to the traits listed in options A, B, and C.
  • However, unlike coelomates, nematodes are pseudocoelomates. This means they have a body cavity not entirely lined with mesoderm.
  • Therefore, the statement 'Coelomates' does not hold true for Nematodes.
  • Consequently, the correct answer is D, "Coelomates".

Question 33:

Which anatomical feature is lacking in Nematodes?





Topic: Anatomy of Nematodes

Correct Answer: B) Circular smooth muscles

Detailed Hints:
  • Nematodes, or roundworms, have a defined anatomical structure.
  • They possess a body cavity, longitudinal band muscles, and a mouth, as described in options A, C, and D.
  • However, Nematodes do not have circular smooth muscles in their structure.
  • Therefore, the feature absent in Nematodes is the 'Circular smooth muscles'.
  • Consequently, the correct answer is B, "Circular smooth muscles".

Question 34:

What is the least common method of asexual reproduction in coelenterates?





Topic: Reproduction in Coelenterates

Correct Answer: C) Fragmentation

Detailed Hints:
  • Coelenterates, or cnidarians, reproduce asexually through a variety of methods.
  • The most common methods are through budding and regeneration, as mentioned in options A and B.
  • However, fragmentation is rarely observed as a method of asexual reproduction in coelenterates.
  • Therefore, the least common method of asexual reproduction in coelenterates is 'Fragmentation'.

Question 35:

How else is Planaria referred to?





Topic: Planaria Nomenclature

Correct Answer: A) Dugesia tigrina

Detailed Hints:
  • Planaria is a type of flatworm, and each specific type of flatworm has a scientific name.
  • Among the provided options, Dugesia tigrina, Taenia solium, Taenia saginata, and liver fluke, only one is synonymous with Planaria.
  • Taenia solium and Taenia saginata are known as tapeworms, and liver fluke refers to Fasciolci hepatica.
  • Thus, the scientific name for Planaria is Dugesia tigrina.
  • Consequently, the correct answer is A, "Dugesia tigrina".

Question 36:

Which statement is accurate concerning Nematodes?





Topic: Nematode Characteristics

Correct Answer: D) All of these

Detailed Hint:
  • Nematodes, also known as roundworms, possess certain defining features.
  • They are characterized by the presence of a cuticle, a pseudocoelom, and the absence of cilia, as given in options A, B, and C.
  • Each of these attributes is correct for Nematodes, making all of these statements accurate.
  • Therefore, the correct response is D, "All of these".

Question 37:

What is not included in the bilateralia group?





Topic: Bilateria Group

Correct Answer: B) Adult sea urchin

Detailed Hint:
  • The category of Bilateria includes organisms that exhibit bilateral symmetry in their adult stage.
  • Adult Annelids, Adult Nematodes, and Adult Mollusca, given in options A, C, and D, all exhibit bilateral symmetry and hence, belong to the Bilateria group.
  • However, while the larval stage of a sea urchin (Adult sea urchin) shows bilateral symmetry, the adult form exhibits radial symmetry, which is characteristic of the Echinodermata phylum.
  • Thus, the Adult sea urchin does not belong to the Bilateria group.
  • Consequently, the correct answer is B, "Adult sea urchin".

Question 38:

Which of the following does not lack polymorphism?





Topic: Polymorphism in Cnidarians

Correct Answer: C) Siphonophora

Detailed Hint:
  • Polymorphism, the occurrence of different forms among members of the same species, is a prevalent trait in numerous members of the cnidarians.
  • Among Hydra, Jellyfish, Siphonophora, and Corals, listed in options A, B, C, and D, polymorphism is absent in all but one.
  • Notably, polymorphism is a significant feature in obelia and animals of the Siphonophora order of cnidarians.
  • Consequently, the correct answer is C, "Siphonophora".

Question 39:

What is another name for the Venus flower basket?





Topic: Nomenclature of Sponges

Correct Answer: D) Euplectella

Detailed Hint:
  • The Venus flower basket is a type of sponge and is known for its delicate, beautiful, siliceous structure that appears to be made of a glass framework.
  • Among the options provided, Sycon, Spongia, Leucosolenia, and Euplectella, only one is synonymous with the Venus flower basket.
  • Therefore, the correct scientific name for the Venus flower basket is Euplectella.
  • Consequently, the correct answer is D, "Euplectella".

Question 40:

Which of the following statements is incorrect about sponges?





Topic: Characteristics of Sponges

Correct Answer: A) Motile

Detailed Hint:
  • Sponges, or poriferas, are characterized by several distinct features.
  • They are typically sessile, have spongin fibers, and demonstrate intracellular digestion, as given in options B, C, and D.
  • However, adult sponges are not motile, although their larval stages can exhibit movement.
  • Thus, the incorrect statement about sponges is that they are "Motile".
  • Consequently, the correct answer is A, "Motile".

Question 41:

What can be said about animals that are composed of a group of cells, but lack tissues and organs?





Topic: Cellular Composition of Animals

Correct Answer: C) Sponges

Detailed Hint:
  • Various organisms demonstrate different levels of cellular organization.
  • Coelenterates, Protozoans, Sponges, and Platyhelminthes, as listed in options A, B, C, and D, represent different organisms with varying structural complexity.
  • Sponges, however, are unique in that they are composed of groups of cells, but lack organized tissues and organs.
  • Therefore, the correct answer is C, "Sponges".

Question 42:

Which of the following can be classified as an acoelomate?





Topic: Coelom Classification

Correct Answer: B) Turbelarian

Detailed Hint:
  • The classification of organisms as coelomates, acoelomates, or pseudocoelomates is based on the presence, absence, or partial presence of a body cavity, known as a coelom.
  • Ascaris, Turbelarian, Earthworm, and Pinworm, given in options A, B, C, and D, each fall into different categories.
  • Specifically, Turbelarians, a type of flatworm, do not have a coelom, categorizing them as acoelomates.
  • Consequently, the correct answer is B, "Turbelarian".

Question 43:

Which statement is not accurate for coelenterates?





Topic: Characteristics of Coelenterates

Correct Answer: A) Predominantly freshwater

Detailed Hint:
  • Coelenterates are a group of aquatic organisms with distinct characteristics.
  • Predominantly freshwater, the presence of polyps, the formation of corals, and diploblastic symmetry, listed in options A, B, C, and D, are all features associated with different types of coelenterates.
  • However, coelenterates are predominantly marine organisms, with only a small fraction inhabiting freshwater environments.
  • Thus, the statement that coelenterates are "Predominantly freshwater" is not accurate.
  • Consequently, the correct answer is A, "Predominantly freshwater".

Question 44:

Which statement does not accurately represent the features of sponges?





Topic: Features of Sponges

Correct Answer: A) Undergo metagenesis

Detailed Hint:
  • Sponges exhibit a variety of unique characteristics.
  • Metagenesis, canal systems, ostia, and oscula, as listed in options A, B, C, and D, are all associated with different sets of organisms.
  • However, sponges do not undergo metagenesis; this is a trait more commonly associated with coelenterates.
  • Therefore, the incorrect statement about sponges is that they "Undergo metagenesis".
  • Consequently, the correct answer is A, "Undergo metagenesis".

Question 45:

What is another name for the Portuguese Man of War?





Topic: Nomenclature of Marine Organisms

Correct Answer: B) Physaliapelagica

Detailed Hint:
  • The Portuguese Man of War is a marine organism known for its unique appearance and potentially dangerous sting.
  • Among the options provided, Sycon, Physaliapelagica, Jelly fish, and Hydra, only one is synonymous with the Portuguese Man of War.
  • Therefore, the correct scientific name for the Portuguese Man of War is Physaliapelagica.
  • Consequently, the correct answer is B, "Physaliapelagica".

Question 46:

Which one of the following is recognized as a predatory sponge?





Topic: Types of Sponges

Correct Answer: C) Cladorhizidae

Detailed Hint:
  • The biodiversity of sponges is vast and includes a variety of types.
  • Sycon, Mykospongida, Cladorhizidae, and Spongilla, as listed in options A, B, C, and D, are different sponge types.
  • Cladorhizidae, however, stands out as it includes species that are predatory, a unique feature among sponges.
  • Consequently, the correct answer is C, "Cladorhizidae".

Question 47:

What is the constant form that Hydra maintains throughout its life?





Topic: Hydra's Life Cycle

Correct Answer: A) Polyps

Detailed Hint:
  • Hydra, a small, simple aquatic animal, possesses a body form that it retains throughout its lifetime.
  • The options provided, Polyps, Medusae, Both A and B, and None of these, suggest different possibilities for this body form.
  • However, Hydra maintains the Polyp form consistently throughout its life, never transitioning into the Medusae stage.
  • Thus, the correct answer is A, "Polyps".

Question 48:

Which of the following organisms uses Jet propulsion as a mode of movement?





Topic: Locomotion in Marine Life

Correct Answer: C) Jelly fish

Detailed Hint:
  • Jet propulsion is a unique and efficient method of movement used by certain aquatic organisms.
  • The options, Sycon, Hydra, Jelly fish, and Obelia, represent various marine organisms.
  • Jellyfish, however, are known to use Jet propulsion, by forcefully expelling water from their bodies for rapid backward movement.
  • Consequently, the correct answer is C, "Jelly fish".

Question 49:

Which animal among the following does not possess an alimentary canal?





Topic: Anatomical Features of Animals

Correct Answer: D) Tape worm

Detailed Hint:
  • The alimentary canal, a critical component of many animal's digestive systems, is absent in a few organisms.
  • Ascaris, Pin worm, Planaria, and Tape worm, the options given, represent different animals.
  • Among these, the Tape worm stands out as it lacks an alimentary canal, absorbing nutrients directly through its skin from the host.
  • Therefore, the correct answer is D, "Tape worm".

Question 50:

What term is used for the inner layer of the enteron in coelenterates?





Topic: Anatomy of Coelenterates

Correct Answer: C) Gastroderm

Detailed Hint:
  • The internal structure of coelenterates includes multiple layers.
  • The options provided, Mesogloea, Pinacoderm, Gastroderm, and None of these, represent possible names for these layers.
  • The inner layer of the enteron in coelenterates is specifically referred to as the Gastroderm.
  • Hence, the correct answer is C, "Gastroderm".

Question 51:

Which layer in cnidarians is considered non-living and non-cellular?





Topic: Cnidarian Structure

Correct Answer: D) Mesogloea

Detailed Hint:
  • Cnidarians possess an array of unique structural characteristics.
  • Among the options, Gastroderm, Ectoderm, Endoderm, and Mesogloea, each signifies a different layer within cnidarians.
  • However, it is the Mesogloea layer that is non-cellular and non-living.
  • Thus, the correct answer is D, "Mesogloea".

Question 52:

Which phylum is characterized by polymorphism?





Topic: Animal Classification

Correct Answer: A) Coelenterata

Detailed Hint:
  • Polymorphism, or the occurrence of different forms among the members of a species, is a distinct trait in certain phylums.
  • Considering the options provided, Coelenterata, Platyhelminthes, Aschelminthes, and Mollusca, each represents a different phylum.
  • Specifically, Coelenterata is the phylum which exhibits the characteristic of polymorphism.
  • Therefore, the correct answer is A, "Coelenterata".

Question 53:

What is the alternate term used for the 'polyp' form?





Topic: Biological Terms

Correct Answer: B) Blastostyle

Detailed Hint:
  • In the biological kingdom, different terms are used for similar or same concepts.
  • The options, Bracts, Blastostyle, Pneumatophore, and All of these, suggest different possibilities for the alternate term for 'polyp'.
  • However, in this context, 'polyp' is also known as Blastostyle.
  • Thus, the correct answer is B, "Blastostyle".

Question 54:

What is the term used for the 'Head' in cestodes?





Topic: Anatomy of Cestodes

Correct Answer: A) Scolex

Detailed Hint:
  • Cestodes, or tapeworms, have specific anatomical terminologies associated with them.
  • The options listed, Scolex, Proglotids, Sucker, and All of these, denote different parts of a cestode.
  • The term used for the head in cestodes is specifically 'Scolex'.
  • Thus, the correct answer is A, "Scolex".

Question 55:

In which organism can Mesogloea be found?





Topic: Structure of Organisms

Correct Answer: A) Physalia

Detailed Hint:
  • Mesogloea, a non-cellular and non-living layer, can be found in certain organisms.
  • The options provided, Physalia, Starfish, Pinworm, and Oyster, represent different types of organisms.
  • Mesogloea is specifically present in Physalia, a type of cnidarian.
  • Therefore, the correct answer is A, "Physalia".
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