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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Q61.
What is the primary function of the air bladder in Osteichthyes?
[Animal-Kingdom] [class-xi]
Respiration
Digestion
Regulates buoyancy
Excretion
Correct Option: C [ Regulates buoyancy ]
Remark: Explanation: Bony fishes have an air bladder which helps regulate their buoyancy, allowing them to remain at a certain depth without constant swimming.
Q62.
An example of a fish kept in an aquarium is:
[Animal-Kingdom] [class-xi]
Labeo (Rohu)
Exocoetus (Flying fish)
Pterophyllum (Angel fish)
Scoliodon (Dog fish)
Correct Option: C [ Pterophyllum (Angel fish) ]
Remark: Explanation: Examples of aquarium fish from the class Osteichthyes include Betta (Fighting fish) and Pterophyllum (Angel fish).
Q63.
The name "Amphibia" signifies that these animals can:
[Animal-Kingdom] [class-xi]
Only live in water
Only live on land
Live in aquatic as well as terrestrial habitats
Fly and swim
Correct Option: C [ Live in aquatic as well as terrestrial habitats ]
Remark: Explanation: The name Amphibia comes from Greek words (Amphi: dual, bios: life), indicating they can live in both aquatic and terrestrial environments.
Q64.
The heart of an amphibian is:
[Animal-Kingdom] [class-xi]
Two-chambered
Three-chambered (two auricles and one ventricle)
Four-chambered
A simple tube
Correct Option: B [ Three-chambered (two auricles and one ventricle) ]
Remark: Explanation: The heart in amphibians is three-chambered, consisting of two auricles and one ventricle.
Q65.
The common chamber in amphibians into which the alimentary, urinary, and reproductive tracts open is the:
[Animal-Kingdom] [class-xi]
Gizzard
Cloaca
Mantle cavity
Spongocoel
Correct Option: B [ Cloaca ]
Remark: Explanation: The alimentary canal, urinary tracts, and reproductive tracts of amphibians open into a common chamber called the cloaca, which opens to the exterior.
Q66.
Which of the following is an example of a limbless amphibian?
[Animal-Kingdom] [class-xi]
Salamandra
Hyla
Ichthyophis
Bufo
Correct Option: C [ Ichthyophis ]
Remark: Explanation: Ichthyophis is an example of a limbless amphibian.
Q67.
The class name "Reptilia" refers to their:
[Animal-Kingdom] [class-xi]
Cold-blooded nature
Presence of scales
Creeping or crawling mode of locomotion
Oviparous reproduction
Correct Option: C [ Creeping or crawling mode of locomotion ]
Remark: Explanation: The class name Reptilia comes from the Latin words repere or reptum, which mean to creep or crawl, referring to their mode of locomotion.
Q68.
The body of a reptile is covered by:
[Animal-Kingdom] [class-xi]
Feathers
Hair
Moist skin
Dry and cornified skin, epidermal scales or scutes
Correct Option: D [ Dry and cornified skin, epidermal scales or scutes ]
Remark: Explanation: The body of reptiles is covered by a dry and cornified skin, which has epidermal scales or scutes.
Q69.
While most reptiles have a three-chambered heart, which reptile has a four-chambered heart?
[Animal-Kingdom] [class-xi]
Snake
Lizard
Turtle
Crocodile
Correct Option: D [ Crocodile ]
Remark: Explanation: The heart is usually three-chambered in reptiles, but it is four-chambered in crocodiles.
Q70.
Poikilotherms are animals that:
[Animal-Kingdom] [class-xi]
Can maintain a constant body temperature
Lack the capacity to regulate their body temperature
Live in very cold climates
Have a four-chambered heart
Correct Option: B [ Lack the capacity to regulate their body temperature ]
Remark: Explanation: Poikilotherms, also known as cold-blooded animals, lack the internal capacity to regulate their body temperature, which fluctuates with the environment. Examples include Chondrichthyes and Reptiles.
