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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Q431.
In which animal is fertilization internal and development direct?
[Animal-Kingdom] [class-xi]
Frog
Human
Starfish
Nereis
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]
Secrete the shell
Digest food
Sense light
Move
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]
Annelids
Arthropods
Molluscs
Platyhelminthes
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]
Crow
Parrot
Ostrich
Eagle
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]
Reptiles
Amphibians
Birds
Mammals
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]
Aves
Mammalia
Amphibia
Osteichthyes
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]
Nephridia
Flame cells
Kidneys
Green glands
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]
Platyhelminthes
Aschelminthes
Annelida
Cnidaria
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]
Mollusca
Echinodermata
Arthropoda
Hemichordata
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]
Kangaroo
Platypus
Bat
Whale
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.
