Practice MCQs, Assertion–Reason, Match List and Fill in the Blanks from NCERT Class XI Animal Kingdom — answers & concise explanations.
Animal Kingdom - Class-XI: Practice ( MCQs, Assertion-Reason, Match List-I with List-II and Fill in the Blanks) for CBSE and NEET preparation 2026.
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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]
A) a-i, b-ii, c-iii, d-iv
B) a-ii, b-i, c-iv, d-iii
C) a-iii, b-iv, c-i, d-ii
D) a-iv, b-iii, c-ii, d-i
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]
Sycon
Euspongia
Spongilla
Hyalonema
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]
Fresh water
Marine water
Terrestrial
Aerial
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]
Porifera
Ctenophora
Cnidaria
Platyhelminthes
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]
Setae
Parapodia
Tentacles
Tube feet
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]
Terrestrial Annelid
Aquatic Annelid
Parasitic Annelid
Arthropod
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]
Annelida
Arthropoda
Mollusca
Echinodermata
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]
Radula
Parapodia
Proboscis
Spicules
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]
Mollusca
Porifera
Annelida
Arthropoda
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]
Starfish
Snail
Earthworm
Hydra
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.
