Answers and bookmarks are saved in this browser, across visits. They do not sync to your account.
Q401.
In Amphioxus, the notochord extends from?
[Animal-Kingdom] [class-xi]
Correct option: A [ Head to tail ]
Remark: Amphioxus belongs to Cephalochordata. In these animals, the notochord extends from the head to the tail region and persists throughout their entire life.
Q402.
In Humans, the notochord is present during which phase?
[Animal-Kingdom] [class-xi]
Correct option: B [ Embryonic life ]
Remark: In humans (and other vertebrates), the notochord is a temporary structure present during embryonic development. It is later replaced by the vertebral column.
Q403.
Roundworms (Aschelminthes) are characterized by which type of body cavity?
[Animal-Kingdom] [class-xi]
Correct option: C [ Pseudocoelomates ]
Remark: Roundworms possess a body cavity that is not fully lined by mesoderm; instead, the mesoderm is present as scattered pouches. This condition is called pseudocoelom.
Q404.
Platyhelminthes (Flatworms) are classified as?
[Animal-Kingdom] [class-xi]
Correct option: A [ Acoelomates ]
Remark: Flatworms lack a body cavity between the body wall and the gut wall. Therefore, they are classified as Acoelomates.
Q405.
Scorpions respire primarily through which organ?
[Animal-Kingdom] [class-xi]
Correct option: C [ Book Lungs ]
Remark: Scorpions are terrestrial arthropods that respire using book lungs, which are specialized respiratory structures resembling the pages of a book.
Q406.
Starfish respire using which structure?
[Animal-Kingdom] [class-xi]
Correct option: B [ Gills ]
Remark: Starfish (Asterias) respire using dermal branchiae or papulae, which effectively function as gills for gas exchange in the water.
Q407.
Balanoglossus is a member of which Phylum?
[Animal-Kingdom] [class-xi]
Correct option: B [ Hemichordata ]
Remark: Balanoglossus belongs to the Phylum Hemichordata. This group was earlier considered a subphylum under Chordata but is now placed as a separate non-chordate phylum.
Q408.
The excretory organ in Balanoglossus is the?
[Animal-Kingdom] [class-xi]
Correct option: C [ Proboscis gland ]
Remark: Balanoglossus performs excretion through a specialized structure called the proboscis gland, which is situated in the proboscis region.
Q409.
The Glomerulus in Balanoglossus is associated with which function?
[Animal-Kingdom] [class-xi]
Correct option: C [ Ultrafiltration ]
Remark: The glomerulus in the proboscis of Balanoglossus is involved in ultrafiltration of blood, aiding in the process of excretion.
Q410.
Which cells in Cnidaria are totipotent and can differentiate into other cell types?
[Animal-Kingdom] [class-xi]
Correct option: B [ Interstitial cells ]
Remark: Interstitial cells in Cnidarians are totipotent stem cells. They have the ability to differentiate into various other cell types, playing a key role in regeneration and growth.