Grade 11 : Biology - Animal Kingdom (Set 4)

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Grade 11 : Biology - Animal Kingdom (Set 4)— Questions & Detailed Solutions

Category Body Cavity Nature Example Phylum
Type A Absence of body cavity Platyhelminthes
Type B Body cavity lined by scattered pouches of mesoderm Aschelminthes
Type C True coelom lined by mesoderm Annelida
Which option correctly identifies the body cavity types for A, B, and C in order?

Category	Body Cavity Nature	Example Phylum
Type A	Absence of body cavity	Platyhelminthes
Type B	Body cavity lined by scattered pouches of mesoderm	Aschelminthes
Type C	True coelom lined by mesoderm	Annelida

(A)

A - Acoelomate, B - Pseudocoelomate, C - Coelomate

(B)

A - Pseudocoelomate, B - Acoelomate, C - Coelomate

(C)

A - Coelomate, B - Acoelomate, C - Pseudocoelomate

(D)

A - Acoelomate, B - Coelomate, C - Pseudocoelomate

View Correct Answer & Detailed Solution

✓ Correct Option: (A)

Explanation:Platyhelminthes lack a body cavity (acoelomate). Aschelminthes possess a pseudocoelom where mesoderm occurs as scattered pouches. Annelids possess a true mesodermally lined coelom (coelomate). Hence, Option A is correct.

Water Flow Pathway in Sponges: External Environment → Minute Pores (X) → Central Cavity (Y) → Large Opening (Z) → External Environment
In Phylum Porifera, what are the names of structures X, Y, and Z involved in the water canal system?

(A)

X: Ostia, Y: Spongocoel, Z: Osculum

(B)

X: Osculum, Y: Spongocoel, Z: Ostia

(C)

X: Ostia, Y: Choanocyte, Z: Osculum

(D)

X: Paragastric cavity, Y: Ostia, Z: Osculum

View Correct Answer & Detailed Solution

✓ Correct Option: (A)

Explanation:In sponges, water enters through minute pores called ostia into a central cavity named spongocoel, from where it goes out through the osculum.

Statement I: Polyps are sessile and cylindrical body forms of Cnidaria (e.g., Hydra, Adamsia).
Statement II: Medusae are umbrella-shaped and free-swimming body forms of Cnidaria (e.g., Aurelia).
Which of the following evaluations of Statements I and II is correct?

(A)

Statement I is correct but Statement II is incorrect

(B)

Statement I is incorrect but Statement II is correct

(C)

Both Statement I and Statement II are correct

(D)

Both Statement I and Statement II are incorrect

View Correct Answer & Detailed Solution

✓ Correct Option: (C)

Explanation:Cnidarians exhibit two basic body forms: Polyp (sessile, cylindrical like Hydra and Adamsia) and Medusa (umbrella-shaped, free-swimming like Aurelia). Both statements are accurate.

A marine organism exhibits bioluminescence and possesses eight external rows of ciliated comb plates used primarily for locomotion.
To which phylum does this organism belong, and what is its body symmetry?

(A)

Phylum Ctenophora; Radial symmetry

(B)

Phylum Cnidaria; Bilateral symmetry

(C)

Phylum Porifera; Asymmetrical

(D)

Phylum Platyhelminthes; Radial symmetry

View Correct Answer & Detailed Solution

✓ Correct Option: (A)

Explanation:Ctenophores (comb jellies) possess eight external rows of ciliated comb plates, exhibit radial symmetry, are diploblastic, and show bioluminescence.

Flatworms (Phylum Platyhelminthes) possess specialized excretory structures called flame cells (protonephridia). What are their primary physiological functions?

(A)

Digestion and nutrient absorption

(B)

Osmoregulation and excretion

(C)

Respiration and circulatory transport

(D)

Locomotion and attachment

View Correct Answer & Detailed Solution

✓ Correct Option: (B)

Explanation:Flame cells in flatworms function primarily in osmoregulation (water balance) and excretion of nitrogenous wastes.

Which set of diagnostic characteristics correctly defines Phylum Aschelminthes (roundworms)?

(A)

Triploblastic, pseudocoelomate, complete digestive tract with muscular pharynx

(B)

Diploblastic, acoelomate, incomplete digestive tract

(C)

Triploblastic, coelomate, open circulatory system

(D)

Diploblastic, pseudocoelomate, flame cells present

View Correct Answer & Detailed Solution

✓ Correct Option: (A)

Explanation:Aschelminthes are triploblastic, pseudocoelomate animals with a complete digestive system featuring a well-developed muscular pharynx.

Nereis is an aquatic annelid possessing lateral appendages used for swimming and movement.
What are these lateral appendages called, and what excretory organ is characteristic of Phylum Annelida?

(A)

Parapodia and Nephridia

(B)

Pseudopodia and Flame cells

(C)

Comb plates and Malpighian tubules

(D)

Radula and Proboscis gland

View Correct Answer & Detailed Solution

✓ Correct Option: (A)

Explanation:Aquatic annelids like Nereis possess lateral appendages called parapodia for locomotion/swimming. Excretion is carried out by nephridia.

Feature Description in Phylum Arthropoda
1. Exoskeleton Chitinous body covering
2. Body cavity Haemocoel with open circulation
3. Excretory structures Malpighian tubules / Antennal glands
4. Skeleton type Internal calcareous endoskeleton
Which of the entries listed in the summary table above is INCORRECT regarding Arthropoda?

Feature	Description in Phylum Arthropoda
1. Exoskeleton	Chitinous body covering
2. Body cavity	Haemocoel with open circulation
3. Excretory structures	Malpighian tubules / Antennal glands
4. Skeleton type	Internal calcareous endoskeleton

(A)

Entry 1

(B)

Entry 2

(C)

Entry 3

(D)

Entry 4

View Correct Answer & Detailed Solution

✓ Correct Option: (D)

Explanation:Arthropods possess a chitinous exoskeleton, not a calcareous endoskeleton. Calcareous endoskeletons are characteristic of Echinoderms.

A soft-bodied unsegmented invertebrate has a distinct head, muscular foot, and visceral hump covered by a soft layer of skin called the mantle.
Which feeding organ located in its mouth is unique to Phylum Mollusca?

(A)

Radula

(B)

Parapodia

(C)

Choanocyte

(D)

Stomochord

View Correct Answer & Detailed Solution

✓ Correct Option: (A)

Explanation:The mouth of many molluscs contains a file-like rasping organ for feeding called the radula.

Q10

Statement I: Adult echinoderms exhibit radial symmetry, whereas their free-swimming larvae show bilateral symmetry.
Statement II: The water vascular system in echinoderms aids in locomotion, capture and transport of food, and respiration.
Which of the following options correctly evaluates Statements I and II?

(A)

Statement I is correct, Statement II is incorrect

(B)

Statement I is incorrect, Statement II is correct

(C)

Both Statement I and Statement II are correct

(D)

Both Statement I and Statement II are incorrect

View Correct Answer & Detailed Solution

✓ Correct Option: (C)

Explanation:Echinoderms display a secondary radial symmetry as adults while larvae are bilaterally symmetrical. Their most distinctive feature is the water vascular system for locomotion, feeding, and respiration.

Q11

Structure of Balanoglossus: Anterior Proboscis → Short Collar → Long Trunk
Why is Hemichordata categorized under Non-chordata rather than Chordata?

(A)

They lack a true notochord and possess a rudimentary collar structure called a stomochord

(B)

They lack pharyngeal gill slits and excretory organs

(C)

They are diploblastic and acoelomate

(D)

They possess a true vertebral column made of cartilage

View Correct Answer & Detailed Solution

✓ Correct Option: (A)

Explanation:Hemichordates lack a true notochord. They have a rudimentary structure in the collar region called a stomochord, placing them in Non-chordata.

Q12

In Subphylum Urochordata (Tunicata), such as Ascidia and Salpa, where and when is the notochord present?

(A)

Only in the larval tail

(B)

Extends from head to tail and persists throughout life

(C)

Replaced by a vertebral column in adults

(D)

Present only in the adult trunk region

View Correct Answer & Detailed Solution

✓ Correct Option: (A)

Explanation:In Urochordata, the notochord is present only in the larval tail, whereas in Cephalochordata, it extends from head to tail region and persists throughout life.

Q13

Organisms belonging to Class Cyclostomata are ectoparasites on some fishes.
Which set of characters correctly describes Cyclostomes (e.g., Petromyzon)?

(A)

Sucking circular mouth without jaws, scale-less body, and 6–15 pairs of gill slits

(B)

Ventral mouth with jaws, body covered by placoid scales, and operculum present

(C)

Terminal mouth, 4 pairs of gills with operculum, air bladder present

(D)

3-chambered heart, dry cornified skin, epidermal scales

View Correct Answer & Detailed Solution

✓ Correct Option: (A)

Explanation:Cyclostomes are jawless vertebrates (Agnatha) with a circular sucking mouth, 6–15 pairs of gill slits for respiration, and skin devoid of scales and paired fins.

Q14

Feature Class Chondrichthyes Class Osteichthyes
Endoskeleton Cartilaginous Bony
Operculum Absent Present
Scales Placoid Cycloid / Ctenoid
Air Bladder X Y
What are the correct statuses for X and Y regarding the presence of an air bladder?

Feature	Class Chondrichthyes	Class Osteichthyes
Endoskeleton	Cartilaginous	Bony
Operculum	Absent	Present
Scales	Placoid	Cycloid / Ctenoid
Air Bladder	X	Y

(A)

X: Absent (must swim constantly), Y: Present (regulates buoyancy)

(B)

X: Present, Y: Absent

(C)

X: Present, Y: Present

(D)

X: Absent, Y: Absent

View Correct Answer & Detailed Solution

✓ Correct Option: (A)

Explanation:Cartilaginous fishes (Chondrichthyes) lack an air bladder (X: Absent) and must swim constantly to avoid sinking. Bony fishes (Osteichthyes) possess an air bladder (Y: Present) which regulates buoyancy.

Q15

Which of the following statements accurately describes the respiratory organs and sensory features of Class Amphibia?

(A)

Respiration occurs via gills, lungs, and skin; a tympanum represents the ear

(B)

Respiration is strictly pulmonary; an external ear pinna is present

(C)

Heart is 4-chambered with complete separation of oxygenated blood

(D)

Body is covered with dry, cornified epidermal scales

View Correct Answer & Detailed Solution

✓ Correct Option: (A)

Explanation:Amphibians can respire through gills (larvae), lungs, and moist skin (cutaneously). They lack an external ear; a tympanum represents the ear.

Q16

Reptiles generally possess a 3-chambered heart with an incomplete inter-ventricular septum.
Which reptile is a notable exception to this rule, possessing a completely 4-chambered heart?

(A)

Crocodile

(B)

Chameleon

(C)

Chelone (Turtle)

(D)

Naja (Cobra)

View Correct Answer & Detailed Solution

✓ Correct Option: (A)

Explanation:Reptiles typically have a 3-chambered heart, but crocodiles are the exception having a fully formed 4-chambered heart.

Q17

Which skeletal and physiological feature is a key flight adaptation in birds (Class Aves)?

(A)

Long bones are pneumatic (hollow with air cavities)

(B)

Presence of teeth in heavy muscular jaws

(C)

Presence of a 3-chambered heart and urinary bladder

(D)

Cold-blooded (poikilothermous) metabolic regulation

View Correct Answer & Detailed Solution

✓ Correct Option: (A)

Explanation:Birds possess pneumatic bones (hollow with air spaces) to reduce overall body weight for flight. They also lack a urinary bladder and teeth.

Q18

Statement I: All species in Class Mammalia are viviparous without any exception.
Statement II: Mammals possess unique features such as mammary glands, hair on skin, and muscular diaphragm.
Which of the following evaluations of Statements I and II is correct?

(A)

Statement I is correct, Statement II is incorrect

(B)

Statement I is incorrect, Statement II is correct

(C)

Both Statement I and Statement II are correct

(D)

Both Statement I and Statement II are incorrect

View Correct Answer & Detailed Solution

✓ Correct Option: (B)

Explanation:Statement I is incorrect because Ornithorhynchus (Platypus) is an oviparous mammal. Statement II is correct as mammary glands, hair, and diaphragm are key mammalian characteristics.

Q19

Phylum Germ Layers Symmetry
Cnidaria Diploblastic Radial
Platyhelminthes Triploblastic Bilateral
Based on the table above, which conclusion regarding body organization is correct?

Phylum	Germ Layers	Symmetry
Cnidaria	Diploblastic	Radial
Platyhelminthes	Triploblastic	Bilateral

(A)

Cnidarians have two germ layers with radial symmetry; Platyhelminthes have three germ layers with bilateral symmetry

(B)

Cnidarians have three germ layers with bilateral symmetry; Platyhelminthes have two germ layers with radial symmetry

(C)

Both phyla are diploblastic and radially symmetrical

(D)

Both phyla are triploblastic and bilaterally symmetrical

View Correct Answer & Detailed Solution

✓ Correct Option: (A)

Explanation:Cnidarians are diploblastic (ectoderm and endoderm) with radial symmetry, while Platyhelminthes are the first triploblastic (ectoderm, mesoderm, endoderm) phylum and exhibit bilateral symmetry.

Q20

Organism Feature / Class
1. Exocoetus p. Electric organ (Chondrichthyes)
2. Torpedo q. Flying fish (Osteichthyes)
3. Salamandra r. Amphibian with tail
4. Pteropus s. Flying mammal (Bat)
Which option represents the correct matching of each organism (1-4) with its description (p-s)?

Organism	Feature / Class
1. Exocoetus	p. Electric organ (Chondrichthyes)
2. Torpedo	q. Flying fish (Osteichthyes)
3. Salamandra	r. Amphibian with tail
4. Pteropus	s. Flying mammal (Bat)

(A)

1-q, 2-p, 3-r, 4-s

(B)

1-p, 2-q, 3-s, 4-r

(C)

1-r, 2-s, 3-p, 4-q

(D)

1-s, 2-r, 3-q, 4-p

View Correct Answer & Detailed Solution

✓ Correct Option: (A)

Explanation:Exocoetus is the flying fish (Osteichthyes - q), Torpedo possesses an electric organ (Chondrichthyes - p), Salamandra is a tailed amphibian (r), and Pteropus is the flying fox/bat (Mammal - s).

Grade 11 : Biology - Animal Kingdom (Set 4)

Grade 11 : Biology - Animal Kingdom (Set 4)— Questions & Detailed Solutions

Category Body Cavity Nature Example Phylum
Type A Absence of body cavity Platyhelminthes
Type B Body cavity lined by scattered pouches of mesoderm Aschelminthes
Type C True coelom lined by mesoderm Annelida
Which option correctly identifies the body cavity types for A, B, and C in order?

Water Flow Pathway in Sponges: External Environment → Minute Pores (X) → Central Cavity (Y) → Large Opening (Z) → External Environment
In Phylum Porifera, what are the names of structures X, Y, and Z involved in the water canal system?

Statement I: Polyps are sessile and cylindrical body forms of Cnidaria (e.g., Hydra, Adamsia).
Statement II: Medusae are umbrella-shaped and free-swimming body forms of Cnidaria (e.g., Aurelia).
Which of the following evaluations of Statements I and II is correct?

A marine organism exhibits bioluminescence and possesses eight external rows of ciliated comb plates used primarily for locomotion.
To which phylum does this organism belong, and what is its body symmetry?

Flatworms (Phylum Platyhelminthes) possess specialized excretory structures called flame cells (protonephridia). What are their primary physiological functions?

Which set of diagnostic characteristics correctly defines Phylum Aschelminthes (roundworms)?

Nereis is an aquatic annelid possessing lateral appendages used for swimming and movement.
What are these lateral appendages called, and what excretory organ is characteristic of Phylum Annelida?

A soft-bodied unsegmented invertebrate has a distinct head, muscular foot, and visceral hump covered by a soft layer of skin called the mantle.
Which feeding organ located in its mouth is unique to Phylum Mollusca?

Structure of Balanoglossus: Anterior Proboscis → Short Collar → Long Trunk
Why is Hemichordata categorized under Non-chordata rather than Chordata?

In Subphylum Urochordata (Tunicata), such as Ascidia and Salpa, where and when is the notochord present?

Organisms belonging to Class Cyclostomata are ectoparasites on some fishes.
Which set of characters correctly describes Cyclostomes (e.g., Petromyzon)?

Feature Class Chondrichthyes Class Osteichthyes
Endoskeleton Cartilaginous Bony
Operculum Absent Present
Scales Placoid Cycloid / Ctenoid
Air Bladder X Y
What are the correct statuses for X and Y regarding the presence of an air bladder?

Which of the following statements accurately describes the respiratory organs and sensory features of Class Amphibia?

Reptiles generally possess a 3-chambered heart with an incomplete inter-ventricular septum.
Which reptile is a notable exception to this rule, possessing a completely 4-chambered heart?

Which skeletal and physiological feature is a key flight adaptation in birds (Class Aves)?

Statement I: All species in Class Mammalia are viviparous without any exception.
Statement II: Mammals possess unique features such as mammary glands, hair on skin, and muscular diaphragm.
Which of the following evaluations of Statements I and II is correct?

Phylum Germ Layers Symmetry
Cnidaria Diploblastic Radial
Platyhelminthes Triploblastic Bilateral
Based on the table above, which conclusion regarding body organization is correct?

Organism Feature / Class
1. Exocoetus p. Electric organ (Chondrichthyes)
2. Torpedo q. Flying fish (Osteichthyes)
3. Salamandra r. Amphibian with tail
4. Pteropus s. Flying mammal (Bat)
Which option represents the correct matching of each organism (1-4) with its description (p-s)?

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Grade 11 : Biology - Animal Kingdom (Set 4)

Grade 11 : Biology - Animal Kingdom (Set 4)— Questions & Detailed Solutions

CategoryBody Cavity NatureExample PhylumType AAbsence of body cavityPlatyhelminthesType BBody cavity lined by scattered pouches of mesodermAschelminthesType CTrue coelom lined by mesodermAnnelidaWhich option correctly identifies the body cavity types for A, B, and C in order?

Water Flow Pathway in Sponges: External Environment → Minute Pores (X) → Central Cavity (Y) → Large Opening (Z) → External EnvironmentIn Phylum Porifera, what are the names of structures X, Y, and Z involved in the water canal system?

Statement I: Polyps are sessile and cylindrical body forms of Cnidaria (e.g., Hydra, Adamsia).Statement II: Medusae are umbrella-shaped and free-swimming body forms of Cnidaria (e.g., Aurelia).Which of the following evaluations of Statements I and II is correct?

A marine organism exhibits bioluminescence and possesses eight external rows of ciliated comb plates used primarily for locomotion.To which phylum does this organism belong, and what is its body symmetry?

Flatworms (Phylum Platyhelminthes) possess specialized excretory structures called flame cells (protonephridia). What are their primary physiological functions?

Which set of diagnostic characteristics correctly defines Phylum Aschelminthes (roundworms)?

Nereis is an aquatic annelid possessing lateral appendages used for swimming and movement.What are these lateral appendages called, and what excretory organ is characteristic of Phylum Annelida?

A soft-bodied unsegmented invertebrate has a distinct head, muscular foot, and visceral hump covered by a soft layer of skin called the mantle.Which feeding organ located in its mouth is unique to Phylum Mollusca?

Structure of Balanoglossus: Anterior Proboscis → Short Collar → Long TrunkWhy is Hemichordata categorized under Non-chordata rather than Chordata?

In Subphylum Urochordata (Tunicata), such as Ascidia and Salpa, where and when is the notochord present?

Organisms belonging to Class Cyclostomata are ectoparasites on some fishes.Which set of characters correctly describes Cyclostomes (e.g., Petromyzon)?

FeatureClass ChondrichthyesClass OsteichthyesEndoskeletonCartilaginousBonyOperculumAbsentPresentScalesPlacoidCycloid / CtenoidAir BladderXYWhat are the correct statuses for X and Y regarding the presence of an air bladder?

Which of the following statements accurately describes the respiratory organs and sensory features of Class Amphibia?

Reptiles generally possess a 3-chambered heart with an incomplete inter-ventricular septum.Which reptile is a notable exception to this rule, possessing a completely 4-chambered heart?

Which skeletal and physiological feature is a key flight adaptation in birds (Class Aves)?

Statement I: All species in Class Mammalia are viviparous without any exception.Statement II: Mammals possess unique features such as mammary glands, hair on skin, and muscular diaphragm.Which of the following evaluations of Statements I and II is correct?

PhylumGerm LayersSymmetryCnidariaDiploblasticRadialPlatyhelminthesTriploblasticBilateralBased on the table above, which conclusion regarding body organization is correct?

OrganismFeature / Class1. Exocoetusp. Electric organ (Chondrichthyes)2. Torpedoq. Flying fish (Osteichthyes)3. Salamandrar. Amphibian with tail4. Pteropuss. Flying mammal (Bat)Which option represents the correct matching of each organism (1-4) with its description (p-s)?

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Category Body Cavity Nature Example Phylum
Type A Absence of body cavity Platyhelminthes
Type B Body cavity lined by scattered pouches of mesoderm Aschelminthes
Type C True coelom lined by mesoderm Annelida
Which option correctly identifies the body cavity types for A, B, and C in order?

Water Flow Pathway in Sponges: External Environment → Minute Pores (X) → Central Cavity (Y) → Large Opening (Z) → External Environment
In Phylum Porifera, what are the names of structures X, Y, and Z involved in the water canal system?

Statement I: Polyps are sessile and cylindrical body forms of Cnidaria (e.g., Hydra, Adamsia).
Statement II: Medusae are umbrella-shaped and free-swimming body forms of Cnidaria (e.g., Aurelia).
Which of the following evaluations of Statements I and II is correct?

A marine organism exhibits bioluminescence and possesses eight external rows of ciliated comb plates used primarily for locomotion.
To which phylum does this organism belong, and what is its body symmetry?

Nereis is an aquatic annelid possessing lateral appendages used for swimming and movement.
What are these lateral appendages called, and what excretory organ is characteristic of Phylum Annelida?

A soft-bodied unsegmented invertebrate has a distinct head, muscular foot, and visceral hump covered by a soft layer of skin called the mantle.
Which feeding organ located in its mouth is unique to Phylum Mollusca?

Structure of Balanoglossus: Anterior Proboscis → Short Collar → Long Trunk
Why is Hemichordata categorized under Non-chordata rather than Chordata?

Organisms belonging to Class Cyclostomata are ectoparasites on some fishes.
Which set of characters correctly describes Cyclostomes (e.g., Petromyzon)?

Feature Class Chondrichthyes Class Osteichthyes
Endoskeleton Cartilaginous Bony
Operculum Absent Present
Scales Placoid Cycloid / Ctenoid
Air Bladder X Y
What are the correct statuses for X and Y regarding the presence of an air bladder?

Reptiles generally possess a 3-chambered heart with an incomplete inter-ventricular septum.
Which reptile is a notable exception to this rule, possessing a completely 4-chambered heart?

Statement I: All species in Class Mammalia are viviparous without any exception.
Statement II: Mammals possess unique features such as mammary glands, hair on skin, and muscular diaphragm.
Which of the following evaluations of Statements I and II is correct?

Phylum Germ Layers Symmetry
Cnidaria Diploblastic Radial
Platyhelminthes Triploblastic Bilateral
Based on the table above, which conclusion regarding body organization is correct?

Organism Feature / Class
1. Exocoetus p. Electric organ (Chondrichthyes)
2. Torpedo q. Flying fish (Osteichthyes)
3. Salamandra r. Amphibian with tail
4. Pteropus s. Flying mammal (Bat)
Which option represents the correct matching of each organism (1-4) with its description (p-s)?