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Q341.
List-I (Class)
List-II (Characteristic)
(a) Mammalia
i) Body covered by dry, cornified skin and scales
(b) Aves
ii) Tympanum represents the ear; skin is moist
(c) Reptilia
iii) Presence of milk-producing mammary glands
(d) Amphibia
iv) Pneumatic (hollow) long bones
[Animal-Kingdom] [class-xi]
Correct option: C [ C ]
Remark: Mammalia: presence of mammary glands (milk production). Aves: pneumatic (hollow) long bones for flight. Reptilia: dry, cornified skin with epidermal scales or scutes. Amphibia: skin moist and tympanum represents the ear.
Q342.
Which of the following is an example of a fresh water sponge?
[Animal-Kingdom] [class-xi]
Correct option: C [ Spongilla ]
Remark: While the vast majority of sponges belonging to Phylum Porifera are marine organisms living in saltwater environments, Spongilla is a notable exception as it is found in fresh water habitats. Other sponges like Sycon and Euspongia are marine.
Q343.
Most members of the Phylum Porifera exist in which type of habitat?
[Animal-Kingdom] [class-xi]
Correct option: B [ Marine water ]
Remark: The Phylum Porifera, commonly known as sponges, consists mostly of marine species. Only a few species, such as Spongilla, are adapted to live in fresh water environments.
Q344.
Pleurobrachia is a member of which animal Phylum?
[Animal-Kingdom] [class-xi]
Correct option: B [ Ctenophora ]
Remark: Pleurobrachia belongs to the Phylum Ctenophora. These animals are often known as comb jellies or sea walnuts and are distinct from Cnidarians.
Q345.
Which specialized lateral appendages help aquatic annelids like Nereis in swimming?
[Animal-Kingdom] [class-xi]
Correct option: B [ Parapodia ]
Remark: Aquatic annelids such as Nereis possess unjointed lateral appendages called parapodia. These muscular structures act like paddles to assist the organism in swimming through water, distinguishing them from terrestrial annelids.
Q346.
Nereis belongs to which category of animals?
[Animal-Kingdom] [class-xi]
Correct option: B [ Aquatic Annelid ]
Remark: Nereis is a polychaete worm found in marine environments, making it an aquatic annelid. In contrast, earthworms are terrestrial annelids.
Q347.
The visceral hump is a distinct body part found in which Phylum?
[Animal-Kingdom] [class-xi]
Correct option: C [ Mollusca ]
Remark: The body of a Mollusc is typically unsegmented and divided into three main regions: the head, the muscular foot, and the visceral hump (or visceral mass), which contains most of the internal organs.
Q348.
What is the name of the file-like rasping organ used for feeding in Molluscs?
[Animal-Kingdom] [class-xi]
Correct option: A [ Radula ]
Remark: The radula is a unique rasping organ found in the mouth of many molluscs. It contains rows of chitinous teeth and functions like a file to scrape or cut food before ingestion.
Q349.
Spicules are skeletal structures primarily found in which Phylum?
[Animal-Kingdom] [class-xi]
Correct option: B [ Porifera ]
Remark: Spicules are structural elements found in the body wall of sponges (Porifera). They provide structural support and protection and can be made of calcium carbonate or silica.
Q350.
Which organism possesses a radula for feeding?
[Animal-Kingdom] [class-xi]
Correct option: B [ Snail ]
Remark: Snails, which are members of the Phylum Mollusca, possess a radula. This file-like organ allows them to scrape algae or plant matter for food.