Class XI · Biology practice

Animal Kingdom MCQs

Build your understanding, check each answer and revisit the questions that need another look.

This Page Score: 0/0
Choose an answer to begin.

Practice scoring: +4 correct, 0 incorrect. Filters apply to this page. Use timed tests for negative marking.

Answers and bookmarks are saved in this browser, across visits. They do not sync to your account.

Q151.

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

[Animal-Kingdom] [class-xi]

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]

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]

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]

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]

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]

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]

Correct option: B   [ Jaws ]

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

Chondrichthyes have an endoskeleton made of __________.

[Animal-Kingdom] [class-xi]

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]

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]

Correct option: A   [ Air bladder ]

Remark: Chondrichthyes lack an air bladder, so they must swim constantly to prevent sinking.
This Page Score: 0/40