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Q431.
In which animal is fertilization internal and development direct?
[Animal-Kingdom] [class-xi]
Correct option: B [ Human ]
Remark: Humans are viviparous mammals with internal fertilization. Development is direct, meaning the young resemble the adult without passing through a larval stage.
Q432.
The function of the mantle in Mollusca is to?
[Animal-Kingdom] [class-xi]
Correct option: A [ Secrete the shell ]
Remark: The mantle is a soft layer of skin that covers the visceral hump in molluscs. Its primary function is to secrete the calcareous shell that protects the animal.
Q433.
Malpighian tubules are the excretory organs found in?
[Animal-Kingdom] [class-xi]
Correct option: B [ Arthropods ]
Remark: Insects and many other arthropods use Malpighian tubules for excretion. These tubules absorb waste solutes from the hemolymph and excrete them into the gut.
Q434.
Which of the following is a flightless bird?
[Animal-Kingdom] [class-xi]
Correct option: C [ Ostrich ]
Remark: The Ostrich (Struthio) is the largest living bird and is incapable of flight. It has adapted to a terrestrial life with strong legs for running.
Q435.
The presence of pneumatic (hollow) bones is a characteristic adaptation of?
[Animal-Kingdom] [class-xi]
Correct option: C [ Birds ]
Remark: Birds possess pneumatic bones, which are hollow and filled with air cavities. This adaptation significantly reduces body weight, making flight easier.
Q436.
Which Class of vertebrates generally possesses a 3-chambered heart?
[Animal-Kingdom] [class-xi]
Correct option: C [ Amphibia ]
Remark: Adult Amphibians typically have a three-chambered heart, consisting of two auricles and one ventricle, allowing for some mixing of oxygenated and deoxygenated blood.
Q437.
Excretion in Earthworms is performed by structures called?
[Animal-Kingdom] [class-xi]
Correct option: A [ Nephridia ]
Remark: Earthworms (Annelids) possess coiled tubular structures called nephridia that function as excretory organs, removing metabolic wastes from the body.
Q438.
Flame cells are the specialized excretory structures of?
[Animal-Kingdom] [class-xi]
Correct option: A [ Platyhelminthes ]
Remark: Flame cells (protonephridia) are the excretory and osmoregulatory structures specific to Platyhelminthes (flatworms).
Q439.
Which Phylum is characterized by the presence of a mantle cavity?
[Animal-Kingdom] [class-xi]
Correct option: A [ Mollusca ]
Remark: The mantle cavity is a space between the mantle and the visceral hump in molluscs. It typically contains the gills (ctenidia) used for respiration.
Q440.
Which animal lays eggs (Oviparous) yet possesses mammary glands?
[Animal-Kingdom] [class-xi]
Correct option: B [ Platypus ]
Remark: The Platypus is a Monotreme, a unique group of mammals that lay eggs (oviparous) but still feed their young with milk produced by mammary glands.