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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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Q151.

In Urochordata, the notochord is present only in the __________.

[Animal-Kingdom] [class-xi]

  • Adult body
  • Larval tail
  • Head region
  • Embryonic stage only
Correct Option: B   [ Larval tail ]

Remark: In Urochordata, the notochord is present only in the larval tail and disappears in the adult.
Q152.

In Cephalochordata, the notochord extends from __________ to __________ and persists throughout life.

[Animal-Kingdom] [class-xi]

  • Head, tail
  • Anterior, posterior
  • Mouth, anus
  • Brain, vertebral column
Correct Option: A   [ Head, tail ]

Remark: In cephalochordates, the notochord extends the entire body length, from head to tail.
Q153.

All vertebrates are chordates but all chordates are not vertebrates, because __________.

[Animal-Kingdom] [class-xi]

  • Some chordates are invertebrates
  • Vertebrates lack a notochord
  • Non-vertebrates have a vertebral column
  • All chordates are marine
Correct Option: A   [ Some chordates are invertebrates ]

Remark: Chordates include protochordates (urochordates and cephalochordates) that do not have a vertebral column.
Q154.

In vertebrates, the notochord present during embryonic development is replaced by a __________.

[Animal-Kingdom] [class-xi]

  • Cartilaginous or bony vertebral column
  • Neural crest
  • Exoskeleton
  • Endostyle
Correct Option: A   [ Cartilaginous or bony vertebral column ]

Remark: In vertebrates, the notochord is replaced by the vertebral column during development.
Q155.

Vertebrates are divided into Agnatha, which lack jaws, and __________, which possess jaws.

[Animal-Kingdom] [class-xi]

  • Pisces
  • Tetrapoda
  • Gnathostomata
  • Amphibia
Correct Option: C   [ Gnathostomata ]

Remark: Jawless vertebrates are Agnatha, while jawed vertebrates are Gnathostomata.
Q156.

Class Cyclostomata includes animals that are __________.

[Animal-Kingdom] [class-xi]

  • Predators
  • Commensals
  • Ectoparasites
  • Endoparasites
Correct Option: C   [ Ectoparasites ]

Remark: Cyclostomes like lampreys and hagfish are ectoparasites on fishes.
Q157.

Cyclostomes have a sucking and circular mouth without __________.

[Animal-Kingdom] [class-xi]

  • Teeth
  • Jaws
  • Tongue
  • Pharynx
Correct Option: B   [ Jaws ]

Remark: Cyclostomes have a circular sucking mouth without jaws.
Q158.

Chondrichthyes have an endoskeleton made of __________.

[Animal-Kingdom] [class-xi]

  • Bone
  • Cartilage
  • Chitin
  • Calcium carbonate
Correct Option: B   [ Cartilage ]

Remark: Members of Chondrichthyes (cartilaginous fishes) have an endoskeleton made of cartilage.
Q159.

The skin of Chondrichthyes is covered with minute __________ scales.

[Animal-Kingdom] [class-xi]

  • Cycloid
  • Ctenoid
  • Placoid
  • Ganoid
Correct Option: C   [ Placoid ]

Remark: The skin of Chondrichthyes is tough and covered with placoid scales.
Q160.

Sharks must swim constantly to avoid sinking because they lack a(n) __________.

[Animal-Kingdom] [class-xi]

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

Remark: Chondrichthyes lack an air bladder, so they must swim constantly to prevent sinking.
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