Class XI · Biology practice

Animal Kingdom MCQs

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Q171.

Among reptiles, the __________ has a four-chambered heart.

[Animal-Kingdom] [class-xi]

Correct option: C   [ Crocodile ]

Remark: Crocodiles are the only reptiles with a completely four-chambered heart.
Q172.

Reptiles are __________, meaning they cannot regulate their body temperature internally.

[Animal-Kingdom] [class-xi]

Correct option: B   [ Poikilothermic ]

Remark: Reptiles are poikilothermic (cold-blooded) and depend on external sources for temperature regulation.
Q173.

The most distinctive feature of birds (Aves) is the presence of __________.

[Animal-Kingdom] [class-xi]

Correct option: B   [ Feathers ]

Remark: Feathers are the most characteristic feature of birds, used for flight, insulation, and display.
Q174.

The forelimbs of birds are modified into __________.

[Animal-Kingdom] [class-xi]

Correct option: A   [ Wings ]

Remark: In birds, the forelimbs are modified into wings for flight.
Q175.

The long bones of birds are hollow with air cavities, a condition known as __________.

[Animal-Kingdom] [class-xi]

Correct option: C   [ Pneumatic ]

Remark: Birds have pneumatic bones, which are hollow and air-filled, reducing weight for flight.
Q176.

Birds are warm-blooded animals, also called __________.

[Animal-Kingdom] [class-xi]

Correct option: B   [ Homoiothermic ]

Remark: Birds are homoiothermic, maintaining a constant body temperature independent of environment.
Q177.

The digestive tract of birds contains two additional chambers, the __________ and the __________.

[Animal-Kingdom] [class-xi]

Correct option: A   [ Crop, gizzard ]

Remark: Birds have a crop for food storage and a muscular gizzard for grinding food.
Q178.

The most unique feature of mammals is the presence of __________.

[Animal-Kingdom] [class-xi]

Correct option: B   [ Mammary glands ]

Remark: Mammals are uniquely characterized by mammary glands that produce milk for young.
Q179.

The skin of mammals is unique in possessing __________.

[Animal-Kingdom] [class-xi]

Correct option: B   [ Hair ]

Remark: Hair is a defining feature of mammals, providing insulation, camouflage, and sensory function.
Q180.

What is the primary function of the air bladder in Osteichthyes? __________

[Animal-Kingdom] [class-xi]

Correct option: C   [ Regulates buoyancy ]

Remark: Bony fishes have an air bladder which helps regulate their buoyancy, allowing them to remain at a certain depth without constant swimming.
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