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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Q131.
Which phylum is characterized by metamerically segmented and coelomate animals __________.
[Animal-Kingdom] [class-xi]
Platyhelminthes
Aschelminthes
Annelida
Mollusca
Correct Option: C [ Annelida ]
Remark: Animals in the Phylum Annelida are triploblastic, metamerically segmented, and coelomate.
Q132.
Aquatic annelids like Nereis possess lateral appendages that help in swimming, called __________.
[Animal-Kingdom] [class-xi]
Fins
Cilia
Flagella
Parapodia
Correct Option: D [ Parapodia ]
Remark: Aquatic annelids like Nereis possess lateral appendages called parapodia, which aid in swimming.
Q133.
The excretory organs in Annelida are __________.
[Animal-Kingdom] [class-xi]
Flame cells
Nephridia
Malpighian tubules
Proboscis gland
Correct Option: B [ Nephridia ]
Remark: Nephridia are the organs that help in osmoregulation and excretion in annelids.
Q134.
Which is the largest phylum of Animalia, including over two-thirds of all named species on Earth? __________.
[Animal-Kingdom] [class-xi]
Mollusca
Chordata
Annelida
Arthropoda
Correct Option: D [ Arthropoda ]
Remark: Arthropoda is the most successful and diverse animal phylum, including insects, crustaceans, arachnids, and more. This abundance is a key characteristic.
Q135.
The body of arthropods is covered by a __________.
[Animal-Kingdom] [class-xi]
Calcareous shell
Chitinous exoskeleton
Spongy layer of skin
Epidermal scales
Correct Option: B [ Chitinous exoskeleton ]
Remark: The arthropod exoskeleton is a hard, protective outer layer made of chitin, a tough and flexible polysaccharide. It provides support and prevents water loss.
Q136.
The respiratory organs in arthropods can be __________.
[Animal-Kingdom] [class-xi]
Gills only
Lungs only
Gills, book gills, book lungs, or tracheal system
Skin only
Correct Option: C [ Gills, book gills, book lungs, or tracheal system ]
Remark: Arthropods have a variety of respiratory organs depending on their habitat, including gills, book gills, book lungs, or a tracheal system.
Q137.
Excretion in arthropods takes place through __________.
[Animal-Kingdom] [class-xi]
Nephridia
Flame cells
Malpighian tubules
Kidneys
Correct Option: C [ Malpighian tubules ]
Remark: Malpighian tubules are the main excretory and osmoregulatory organs in insects and other terrestrial arthropods, removing waste from the hemolymph.
Q138.
Limulus, also known as the King crab, is an example of a __________.
[Animal-Kingdom] [class-xi]
Gregarious pest
Vector
Economically important insect
Living fossil
Correct Option: D [ Living fossil ]
Remark: A living fossil is an organism that has retained a primitive body plan and has remained relatively unchanged over millions of years. Limulus is a classic example.
Q139.
Which is the second largest animal phylum __________.
[Animal-Kingdom] [class-xi]
Arthropoda
Chordata
Mollusca
Annelida
Correct Option: C [ Mollusca ]
Remark: Mollusca is the second largest animal phylum.
Q140.
The body of molluscs is unsegmented and consists of a distinct head, a muscular foot, and a __________.
[Animal-Kingdom] [class-xi]
Visceral hump
Collar
Thorax
Cephalothorax
Correct Option: A [ Visceral hump ]
Remark: The molluscan body consists of three parts: a distinct head, a muscular foot, and a visceral hump containing most organs.
