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Animal Kingdom — Class XI: NEET & CBSE MCQs

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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Q161.

In male cartilaginous fishes, the pelvic fins bear structures called __________ which aid in internal fertilisation.

[Animal-Kingdom] [class-xi]

  • Claspers
  • Hooks
  • Suckers
  • Spines
Correct Option: A   [ Claspers ]

Remark: Claspers are modified pelvic fins in male cartilaginous fishes used during copulation.
Q162.

The class of fishes that includes both marine and freshwater species with a bony endoskeleton is __________.

[Animal-Kingdom] [class-xi]

  • Cyclostomata
  • Chondrichthyes
  • Osteichthyes
  • Amphibia
Correct Option: C   [ Osteichthyes ]

Remark: Osteichthyes are bony fishes with a skeleton made of bone, found in both marine and freshwater.
Q163.

In bony fishes, the gills are covered by a bony flap called the __________.

[Animal-Kingdom] [class-xi]

  • Mantle
  • Operculum
  • Carapace
  • Scute
Correct Option: B   [ Operculum ]

Remark: The operculum is a protective bony flap covering the gills in Osteichthyes.
Q164.

The __________ in bony fishes regulates buoyancy.

[Animal-Kingdom] [class-xi]

  • Air bladder
  • Swim fin
  • Operculum
  • Cartilage
Correct Option: A   [ Air bladder ]

Remark: The air bladder in bony fishes helps regulate buoyancy.
Q165.

The name Amphibia signifies their ability to live in both __________ and __________ habitats.

[Animal-Kingdom] [class-xi]

  • Aquatic, terrestrial
  • Freshwater, saltwater
  • Land, air
  • Trees, burrows
Correct Option: A   [ Aquatic, terrestrial ]

Remark: The word Amphibia means “dual life,” living in both water and on land.
Q166.

In amphibians, the alimentary canal, urinary tract, and reproductive tract open into a common chamber called the __________.

[Animal-Kingdom] [class-xi]

  • Colon
  • Gizzard
  • Cloaca
  • Pharynx
Correct Option: C   [ Cloaca ]

Remark: The cloaca is a common chamber into which the alimentary, urinary, and reproductive tracts open in amphibians.
Q167.

The heart of amphibians is __________-chambered.

[Animal-Kingdom] [class-xi]

  • Two
  • Three
  • Four
  • One
Correct Option: B   [ Three ]

Remark: Amphibians have a three-chambered heart with two auricles and one ventricle.
Q168.

The limbless amphibians, such as *Ichthyophis*, are also known as __________.

[Animal-Kingdom] [class-xi]

  • Frogs
  • Caecilians
  • Salamanders
  • Toads
Correct Option: B   [ Caecilians ]

Remark: Caecilians are limbless amphibians that resemble worms or snakes.
Q169.

The name Reptilia refers to their mode of locomotion, which is __________.

[Animal-Kingdom] [class-xi]

  • Flying
  • Jumping
  • Creeping or crawling
  • Swimming
Correct Option: C   [ Creeping or crawling ]

Remark: The term Reptilia is derived from “repere” or “reptum,” meaning to creep or crawl.
Q170.

The body of reptiles is covered with dry, cornified skin and epidermal scales or __________.

[Animal-Kingdom] [class-xi]

  • Hair
  • Scutes
  • Feathers
  • Spicules
Correct Option: B   [ Scutes ]

Remark: Reptiles have dry, cornified skin with epidermal scales or scutes for protection.
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