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Q71.
The characteristic feature of Aves is the presence of:
[Animal-Kingdom] [class-xi]
Correct option: C [ Feathers ]
Remark: Explanation: The defining characteristic feature of the class Aves (birds) is the presence of feathers.
Q72.
The forelimbs of birds are modified into:
[Animal-Kingdom] [class-xi]
Correct option: B [ Wings ]
Remark: Explanation: In birds, the forelimbs have been modified into wings for flight.
Q73.
The long bones of birds are hollow with air cavities, a condition known as:
[Animal-Kingdom] [class-xi]
Correct option: C [ Pneumatic ]
Remark: Explanation: The long bones of birds are hollow and contain air cavities (pneumatic), which makes their endoskeleton light for flying.
Q74.
Homoiothermous (warm-blooded) animals are characterized by:
[Animal-Kingdom] [class-xi]
Correct option: C [ The ability to maintain a constant body temperature ]
Remark: Explanation: Homoiothermous (warm-blooded) animals, like birds and mammals, are able to maintain a constant internal body temperature regardless of the external environment.
Q75.
The digestive tract of birds has additional chambers called the:
[Animal-Kingdom] [class-xi]
Correct option: C [ Crop and gizzard ]
Remark: Explanation: The digestive tract of birds has two additional chambers: the crop for storing food and the gizzard for grinding it.
Q76.
The most unique mammalian characteristic is the presence of:
[Animal-Kingdom] [class-xi]
Correct option: C [ Milk producing glands (mammary glands) ]
Remark: Explanation: The most unique characteristic of mammals is the presence of milk-producing mammary glands used to nourish their young.
Q77.
Which of the following is an oviparous (egg-laying) mammal?
[Animal-Kingdom] [class-xi]
Correct option: D [ Ornithorhynchus (Platypus) ]
Remark: Explanation: While most mammals are viviparous (give live birth), there are exceptions. The Platypus (Ornithorhynchus) is an oviparous mammal, meaning it lays eggs.
Q78.
The skin of mammals is unique in possessing:
[Animal-Kingdom] [class-xi]
Correct option: C [ Hair ]
Remark: Explanation: The skin of mammals is unique among animals for possessing hair.
Q79.
The water vascular system is a characteristic of which group?
[Animal-Kingdom] [class-xi]
Correct option: C [ Echinodermata ]
Remark: Explanation: The water vascular system is the characteristic and most distinctive feature of the phylum Echinodermata.
Q80.
In which of the following phyla is segmentation first observed?
[Animal-Kingdom] [class-xi]
Correct option: C [ Annelida ]
Remark: Explanation: Body segmentation (metamerism) is first observed in the Phylum Annelida.