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Q351.
A defining characteristic of appendages in the Phylum Arthropoda is that they are?
[Animal-Kingdom] [class-xi]
Correct option: B [ Jointed ]
Remark: The name Arthropoda literally translates to "jointed feet" or "jointed appendages." This is a key defining characteristic that distinguishes them from other phyla like Annelida.
Q352.
The organism Laccifer is commonly known as?
[Animal-Kingdom] [class-xi]
Correct option: C [ Lac insect ]
Remark: Laccifer is the scientific name for the Lac insect. It is an economically important insect belonging to the Phylum Arthropoda that produces lac resin.
Q353.
Which of the following Arthropods acts as a vector for disease?
[Animal-Kingdom] [class-xi]
Correct option: C [ Anopheles ]
Remark: The Anopheles mosquito is a vector because it transmits disease-causing pathogens (like the malaria parasite) from one host to another. Other vectors include Culex and Aedes mosquitoes.
Q354.
Limulus is often referred to as a "Living Fossil." What is its common name?
[Animal-Kingdom] [class-xi]
Correct option: A [ King Crab ]
Remark: Limulus is commonly known as the King Crab or Horseshoe Crab. It is called a living fossil because it has remained essentially unchanged for millions of years.
Q355.
What is the scientific name for the Silkworm?
[Animal-Kingdom] [class-xi]
Correct option: C [ Bombyx ]
Remark: Bombyx mori is the scientific name for the Silkworm, which is economically important for the production of silk. It belongs to the Phylum Arthropoda.
Q356.
Locusta is an example of an Arthropod that is known as a?
[Animal-Kingdom] [class-xi]
Correct option: B [ Gregarious pest ]
Remark: Locusta, or the locust, is classified as a gregarious pest because it forms large swarms that can cause extensive damage to crops and vegetation.
Q357.
Which Phylum represents the first true Coelomates in the Animal Kingdom?
[Animal-Kingdom] [class-xi]
Correct option: C [ Annelida ]
Remark: Annelids are the first animals in the evolutionary sequence to possess a true coelom (a body cavity lined entirely by mesoderm). Previous phyla like Aschelminthes were pseudocoelomates.
Q358.
The Octopus is a member of which Phylum?
[Animal-Kingdom] [class-xi]
Correct option: B [ Mollusca ]
Remark: The Octopus is a cephalopod belonging to the Phylum Mollusca. Despite lacking a visible external shell, it shares the fundamental molluscan body plan.
Q359.
What type of body symmetry is typically found in Molluscs like Snails and Octopus?
[Animal-Kingdom] [class-xi]
Correct option: B [ Bilateral ]
Remark: Molluscs generally exhibit bilateral symmetry, meaning their body can be divided into two identical halves along a single plane. However, some snails (gastropods) become asymmetrical due to torsion.
Q360.
Regarding germ layers, Molluscs are considered?
[Animal-Kingdom] [class-xi]
Correct option: B [ Triploblastic ]
Remark: Molluscs are triploblastic animals, meaning their body tissues are derived from three embryonic germ layers: ectoderm, mesoderm, and endoderm.