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Q131.
Which phylum is characterized by metamerically segmented and coelomate animals __________.
[Animal-Kingdom] [class-xi]
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]
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]
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]
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]
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]
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]
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]
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]
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]
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.