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Q31.
In Aschelminthes, the sexes are separate. This condition is known as:
[Animal-Kingdom] [class-xi]
Correct option: C [ Dioecious ]
Remark: Explanation: In Aschelminthes, sexes are separate, meaning males and females are distinct. This condition is described as dioecious.
Q32.
Which phylum is characterized by metamerically segmented and coelomate animals?
[Animal-Kingdom] [class-xi]
Correct option: C [ Annelida ]
Remark: Explanation: Animals in the Phylum Annelida are triploblastic, metamerically segmented, and coelomate.
Q33.
Aquatic annelids like Nereis possess lateral appendages that help in swimming, called:
[Animal-Kingdom] [class-xi]
Correct option: D [ Parapodia ]
Remark: Explanation: Aquatic annelids like Nereis possess lateral appendages called parapodia, which aid in swimming.
Q34.
The excretory organs in Annelida are:
[Animal-Kingdom] [class-xi]
Correct option: B [ Nephridia ]
Remark: Explanation: Nephridia are the organs that help in osmoregulation and excretion in annelids.
Q35.
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: Explanation: Arthropoda is the largest phylum in the Animalia kingdom, including over two-thirds of all named species on Earth, most of which are insects.
Q36.
The body of arthropods is covered by a:
[Animal-Kingdom] [class-xi]
Correct option: B [ Chitinous exoskeleton ]
Remark: Explanation: The body of arthropods is covered by a hard, protective exoskeleton made of chitin.
Q37.
The respiratory organs in arthropods can be:
[Animal-Kingdom] [class-xi]
Correct option: C [ Gills, book gills, book lungs, or tracheal system ]
Remark: Explanation: Arthropods have a variety of respiratory organs depending on their habitat, including gills, book gills, book lungs, or a tracheal system.
Q38.
Excretion in arthropods takes place through:
[Animal-Kingdom] [class-xi]
Correct option: C [ Malpighian tubules ]
Remark: Explanation: Excretion in arthropods is carried out by structures known as malpighian tubules.
Q39.
Limulus, also known as the King crab, is an example of a:
[Animal-Kingdom] [class-xi]
Correct option: D [ Living fossil ]
Remark: Explanation: Limulus, the king crab, is considered a living fossil, an example of an organism that has remained largely unchanged over a long geological period.
Q40.
Which is the second largest animal phylum?
[Animal-Kingdom] [class-xi]
Correct option: C [ Mollusca ]
Remark: Explanation: Mollusca is the second largest animal phylum.