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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Q411.
Cnidocytes are specialized cells used for?
[Animal-Kingdom] [class-xi]
Digestion
Excretion
Defense and prey capture
Respiration
Correct Option: C [ Defense and prey capture ]
Remark: Cnidocytes (or cnidoblasts) contain stinging capsules called nematocysts. They are used for anchorage, defense against predators, and capturing prey.
Q412.
Choanocytes (Collar cells) are characteristic of which Phylum?
[Animal-Kingdom] [class-xi]
Cnidaria
Porifera
Ctenophora
Platyhelminthes
Correct Option: B [ Porifera ]
Remark: Choanocytes are specialized flagellated collar cells found lining the spongocoel and canals of sponges (Porifera). They generate water currents and help in filtering food.
Q413.
Which group possesses a persistent notochord throughout their entire life?
[Animal-Kingdom] [class-xi]
Urochordata
Chondrichthyes
Osteichthyes
Mammalia
Correct Option: B [ Chondrichthyes ]
Remark: Chondrichthyes (cartilaginous fishes like sharks and rays) retain the notochord throughout their adult life, unlike Osteichthyes where it is largely replaced.
Q414.
The Water Vascular System is a unique characteristic of which Phylum?
[Animal-Kingdom] [class-xi]
Porifera
Echinodermata
Mollusca
Hemichordata
Correct Option: B [ Echinodermata ]
Remark: The Water Vascular System is a distinct hydraulic system found only in Echinoderms. It aids in functions like locomotion, food capture, and transport.
Q415.
Which of the following is NOT a direct function of the Water Vascular System?
[Animal-Kingdom] [class-xi]
Locomotion
Food transport
Excretion
Digestion
Correct Option: D [ Digestion ]
Remark: While the Water Vascular System helps in locomotion, capture and transport of food, and respiration/excretion, digestion itself is a function of the digestive system, not the vascular system.
Q416.
Which locomotory structures in Echinoderms are connected to the Water Vascular System?
[Animal-Kingdom] [class-xi]
Parapodia
Tube feet
Tentacles
Setae
Correct Option: B [ Tube feet ]
Remark: Tube feet (podia) are small, active tubular projections connected to the Water Vascular System. They are the primary organs for locomotion in Echinoderms.
Q417.
Sponges are placed in Phylum Porifera primarily due to the presence of?
[Animal-Kingdom] [class-xi]
Vertebral column
Water Canal System
Gills
Kidneys
Correct Option: B [ Water Canal System ]
Remark: The Water Canal System is the defining characteristic of Porifera. It creates a path for water flow which brings in food and oxygen and removes waste.
Q418.
Which organ is typically absent in birds to reduce body weight for flight?
[Animal-Kingdom] [class-xi]
Kidney
Lung
Urinary Bladder
Heart
Correct Option: C [ Urinary Bladder ]
Remark: To minimize body weight and facilitate flight, most birds lack a urinary bladder. They excrete nitrogenous waste as uric acid paste rather than storing liquid urine.
Q419.
Which bird is an exception to the rule and possesses a urinary bladder?
[Animal-Kingdom] [class-xi]
Pigeon
Ostrich
Sparrow
Crow
Correct Option: B [ Ostrich ]
Remark: The Ostrich is a flightless bird and is a notable exception among aves as it possesses a urinary bladder for storing urine.
Q420.
The primary excretory organ in all Chordates (Vertebrates) is the?
[Animal-Kingdom] [class-xi]
Nephridia
Flame cells
Kidney
Skin
Correct Option: C [ Kidney ]
Remark: Kidneys are the paired organs responsible for excretion and osmoregulation in all vertebrates (chordates), filtering blood to remove waste products.
