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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Q381.
Which reptile is an exception and possesses a four-chambered heart?
[Animal-Kingdom] [class-xi]
Garden Lizard
Turtle
Crocodile
Snake
Correct Option: C [ Crocodile ]
Remark: While most reptiles have a three-chambered heart, Crocodiles and Alligators are exceptions that possess a fully four-chambered heart, similar to birds and mammals.
Q382.
Metameric segmentation is a characteristic feature of which organism?
[Animal-Kingdom] [class-xi]
Ascaris
Taenia
Earthworm
Snail
Correct Option: C [ Earthworm ]
Remark: True metameric segmentation, where the body is divided into repeating segments both externally and internally, is a hallmark of the Phylum Annelida, represented by the Earthworm.
Q383.
Sea Horse and Flying Fish are classified as?
[Animal-Kingdom] [class-xi]
Amphibians
Reptiles
Fish
Mammals
Correct Option: C [ Fish ]
Remark: Both Sea Horse (Hippocampus) and Flying Fish (Exocoetus) are true bony fishes belonging to the Class Osteichthyes.
Q384.
Regarding body temperature regulation, Fishes are generally?
[Animal-Kingdom] [class-xi]
Homeothermic
Warm blooded
Poikilothermic
Endothermic
Correct Option: C [ Poikilothermic ]
Remark: Fishes are poikilothermic or cold-blooded animals, meaning they cannot regulate their internal body temperature and it fluctuates with the environment.
Q385.
The digestive system in Platyhelminthes is described as?
[Animal-Kingdom] [class-xi]
Complete
Incomplete
Absent
Extracellular only
Correct Option: B [ Incomplete ]
Remark: Platyhelminthes have an incomplete digestive system because they possess only a single opening that serves as both the mouth for ingestion and the anus for egestion.
Q386.
Nereis exhibits which sexual condition?
[Animal-Kingdom] [class-xi]
Monoecious
Dioecious
Asexual
Hermaphrodite
Correct Option: B [ Dioecious ]
Remark: Nereis is dioecious, meaning that the sexes are separate; distinct male and female individuals exist. This contrasts with some other annelids.
Q387.
Earthworms and Leeches are characterized as being?
[Animal-Kingdom] [class-xi]
Dioecious
Monoecious
Unisexual
Sterile
Correct Option: B [ Monoecious ]
Remark: Earthworms and Leeches are monoecious (hermaphrodites), meaning both male and female reproductive organs are present within the same individual.
Q388.
Arthropods constitute approximately what fraction of all named animal species?
[Animal-Kingdom] [class-xi]
One half
One third
Over two thirds
One fourth
Correct Option: C [ Over two thirds ]
Remark: The Phylum Arthropoda is incredibly diverse and successful, constituting over two-thirds of all named animal species on Earth.
Q389.
What types of eyes can be found in Arthropods?
[Animal-Kingdom] [class-xi]
Simple only
Compound only
Simple and Compound
No eyes
Correct Option: C [ Simple and Compound ]
Remark: Arthropods possess varied sensory structures. They can have simple eyes, compound eyes (mosaic vision), or both, depending on the species.
Q390.
Which feature is present in all vertebrates without exception?
[Animal-Kingdom] [class-xi]
Body with scales
Exoskeleton
Well developed skull
Two pairs of appendages
Correct Option: C [ Well developed skull ]
Remark: A defining characteristic of the subphylum Vertebrata is the presence of a well-developed skull or cranium to protect the brain, hence they are also called Craniata.
