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Q421.
Besides excretion, Kidneys in vertebrates play a crucial role in?
[Animal-Kingdom] [class-xi]
Correct option: B [ Osmoregulation ]
Remark: Kidneys maintain the water and salt balance of the body fluids, a process known as osmoregulation, in addition to removing metabolic wastes.
Q422.
Which structure supplements respiration in birds?
[Animal-Kingdom] [class-xi]
Correct option: C [ Air sacs ]
Remark: Birds possess air sacs connected to their lungs. These sacs allow for a unidirectional flow of air, supplementing respiration and ensuring a constant supply of oxygen.
Q423.
The Air sacs in birds are directly connected to the?
[Animal-Kingdom] [class-xi]
Correct option: B [ Lungs ]
Remark: The air sacs are extensions of the lungs in birds. They do not facilitate gas exchange themselves but pump air through the lungs where exchange occurs.
Q424.
The shell of Molluscs is primarily composed of?
[Animal-Kingdom] [class-xi]
Correct option: C [ Calcium Carbonate ]
Remark: The protective shell found in many molluscs is secreted by the mantle and is composed mainly of calcium carbonate (calcareous).
Q425.
The body of a Mollusc is divided into Head, Visceral Hump, and?
[Animal-Kingdom] [class-xi]
Correct option: C [ Muscular Foot ]
Remark: The generalized molluscan body plan consists of three main parts: an anterior head, a dorsal visceral hump (mass), and a ventral muscular foot used for locomotion.
Q426.
What type of skull is present in Amphibians and Mammals?
[Animal-Kingdom] [class-xi]
Correct option: B [ Dicondylic ]
Remark: Amphibians and Mammals possess a dicondylic skull, meaning the skull articulates with the vertebral column via two occipital condyles.
Q427.
What type of skull is typically found in Reptiles and Birds?
[Animal-Kingdom] [class-xi]
Correct option: B [ Monocondylic ]
Remark: Reptiles and Birds have a monocondylic skull, which possesses only a single occipital condyle for articulation with the atlas vertebra.
Q428.
A Dicondylic skull is characterized by having how many occipital condyles?
[Animal-Kingdom] [class-xi]
Correct option: B [ Two ]
Remark: The term "Dicondylic" refers to the presence of two occipital condyles, which are the bony protuberances connecting the skull to the neck.
Q429.
Amphioxus is commonly referred to as?
[Animal-Kingdom] [class-xi]
Correct option: A [ Lancelet ]
Remark: Amphioxus is a small, fish-like cephalochordate commonly known as the Lancelet due to its lance-like shape.
Q430.
Which of the following organisms has a single opening acting as both mouth and anus?
[Animal-Kingdom] [class-xi]
Correct option: B [ Tapeworm ]
Remark: Tapeworms (Platyhelminthes) exhibit a blind-sac body plan with an incomplete digestive system, where a single opening serves for both ingestion and egestion.