Practice MCQs, Assertion–Reason, Match List and Fill in the Blanks from NCERT Class XI Animal Kingdom — answers & concise explanations.
Animal Kingdom - Class-XI: Practice ( MCQs, Assertion-Reason, Match List-I with List-II and Fill in the Blanks) for CBSE and NEET preparation 2026.
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Q291.
Assertion (A): Segmentation is a characteristic feature of arthropods.
Reason (R): The phenomenon where the body is externally and internally divided into segments is called metamerism.
[Animal-Kingdom] [class-xi]
a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
c) Assertion (A) is true but Reason (R) is false.
d) Assertion (A) is false but Reason (R) is true.
Correct Option: A [ ]
Remark: Both A and R are true and R is the correct explanation of A. Explanation: Arthropods are segmented animals and metamerism refers to serial segmentation of the body.
Q292.
Assertion (A): The body of a hemichordate consists of a proboscis, collar, and trunk.
Reason (R): Hemichordates are bilaterally symmetrical, triploblastic, and coelomate animals.
[Animal-Kingdom] [class-xi]
a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
c) Assertion (A) is true but Reason (R) is false.
d) Assertion (A) is false but Reason (R) is true.
Correct Option: B [ ]
Remark: Both A and R are true but R is not the correct explanation of A. Explanation: Both statements describe hemichordate structure and body plan; the body divisions do not directly explain the germ layer/coelom condition.
Q293.
Assertion (A): Aves and Mammalia are grouped under Tetrapoda.
Reason (R): They bear two pairs of limbs.
[Animal-Kingdom] [class-xi]
a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
c) Assertion (A) is true but Reason (R) is false.
d) Assertion (A) is false but Reason (R) is true.
Correct Option: A [ ]
Remark: Both A and R are true and R is the correct explanation of A. Explanation: Aves and Mammalia are tetrapods characterized by two pairs of limbs — a defining trait of Tetrapoda.
Q294.
Match List-I with List-II and select the correct option.
List-I (Distinctive Feature)
List-II (Phylum)
(a) Canal system
(i) Ctenophora
(b) Water vascular system
(ii) Annelida
(c) Metamerism (Segmentation)
(iii) Echinodermata
(d) Comb plates
(iv) Porifera
[Animal-Kingdom] [class-xi]
1. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
2. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
3. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
4. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
Correct Option: A [ ]
Remark: (a) Canal system → (iv) Porifera: Members of the Phylum Porifera (sponges) have a characteristic water transport or canal system where water enters through pores (ostia) into a central cavity.
(b) Water vascular system → (iii) Echinodermata: The most distinctive feature of Phylum Echinodermata is the presence of a water vascular system, which aids in locomotion, food capture, and respiration.
(c) Metamerism → (ii) Annelida: Phylum Annelida is characterized by metameric segmentation, where the body is externally and internally divided into repeating segments.
(d) Comb plates → (i) Ctenophora: Phylum Ctenophora is distinguished by having eight external rows of ciliated comb plates, which are used for locomotion.
Remark: (a) Pneumatic bones → (ii) Aves: Birds have hollow bones with air cavities (pneumatic) that reduce weight for flight. (b) Mammary glands → (iv) Mammalia: Mammals are uniquely characterized by the presence of mammary glands for nourishing young. (c) Operculum → (iii) Osteichthyes: Bony fishes have their gills covered by a bony flap called an operculum. (d) Poison sting → (i) Chondrichthyes: Some cartilaginous fishes, such as Trygon (stingray), possess a poison sting.
Q297.
List-I (Class)
List-II (Distinctive Feature)
(a) Reptilia
(i) Dry cornified skin, Scales
(b) Aves
(ii) Feathers, Pneumatic bones
(c) Mammalia
(iii) Mammary glands, Hair
(d) Amphibia
(iv) Cloaca, Three-chambered heart
[Animal-Kingdom] [class-xi]
1. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
2. (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
3. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
4. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
Correct Option: C [ 3. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) ]
Remark: (a) Reptilia → (iv) Dry cornified skin, Scales: Reptiles are mostly terrestrial and their body is covered by dry, cornified skin with scales or scutes.
(b) Aves → (i) Feathers, Pneumatic bones: Birds are characterised by feathers and hollow (pneumatic) bones for flight.
(c) Mammalia → (ii) Mammary glands, Hair: Mammals possess mammary glands and hair.
(d) Amphibia → (iii) Cloaca, Three-chambered heart: Amphibians have a cloaca and a three-chambered heart.
Q298.
Match List-I with List-II and select the correct option.
List-I (Phylum)
List-II (Distinctive Feature)
(a) Porifera
(i) Comb plates
(b) Coelenterata
(ii) Water vascular system
(c) Ctenophora
(iii) Cnidoblasts
(d) Echinodermata
(iv) Canal system
[Animal-Kingdom] [class-xi]
1. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
2. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
3. (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
4. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
Correct Option: A [ 1. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii) ]
Remark: Porifera → Canal system: Members of Phylum Porifera (sponges) show a water canal system with ostia and spongocoel.
Coelenterata (Cnidaria) → Cnidoblasts: Presence of stinging cells (cnidoblasts) is characteristic.
Ctenophora → Comb plates: Ctenophores bear eight rows of ciliated comb plates for locomotion.
Echinodermata → Water vascular system: Echinoderms possess a water vascular system used in locomotion and food capture.
Q299.
List-I (Phylum)
List-II (Level of Organisation)
(a) Porifera
i) Organ system level
(b) Coelenterata
ii) Tissue level
(c) Platyhelminthes
iii) Cellular level
(d) Annelida
iv) Organ level
[Animal-Kingdom] [class-xi]
A) a-iv, b-i, c-ii, d-iii
B) a-ii, b-iii, c-iv, d-i
C) a-iii, b-ii, c-iv, d-i
D) a-iii, b-iv, c-i, d-ii
Correct Option: C [ C ]
Remark: • Porifera exhibits a cellular level of organisation, where cells are arranged as loose aggregates. • Coelenterata has tissue level organisation. • Platyhelminthes exhibits organ level organisation. • Annelida has organ system level organisation.
