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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Q1.
What is the most fundamental reason for the classification of over a million animal species?
[Animal-Kingdom] [class-xi]
To give them common names
To understand their habitats
To assign a systematic position to newly described species
To study their feeding habits
Correct Option: C [ To assign a systematic position to newly described species ]
Remark: Explanation: Classification is important because it helps in assigning a systematic position to newly described species among the million-plus species already known.
Q2.
Which of the following is NOT used as a basis for animal classification?
[Animal-Kingdom] [class-xi]
Arrangement of cells
Body symmetry
Nature of coelom
Habitat of the animal
Correct Option: D [ Habitat of the animal ]
Remark: Explanation: The fundamental features used for animal classification include the arrangement of cells, body symmetry, nature of coelom, and patterns of various organ systems. Habitat is an ecological characteristic, not a fundamental structural one.
Q3.
The level of organisation in sponges, where cells are arranged as loose cell aggregates, is called:
[Animal-Kingdom] [class-xi]
Tissue level
Organ level
Organ system level
Cellular level
Correct Option: D [ Cellular level ]
Remark: Explanation: In sponges, cells are arranged as loose aggregates, which is known as the cellular level of organisation.
Q4.
Coelenterates exhibit which level of organisation?
[Animal-Kingdom] [class-xi]
Cellular level
Tissue level
Organ level
Organ system level
Correct Option: B [ Tissue level ]
Remark: Explanation: In coelenterates, cells performing the same function are arranged into tissues, which is called the tissue level of organisation.
Q5.
A digestive system with a single opening that serves as both mouth and anus is called:
[Animal-Kingdom] [class-xi]
Complete
Incomplete
Advanced
Rudimentary
Correct Option: B [ Incomplete ]
Remark: Explanation: An incomplete digestive system, found in phyla like Platyhelminthes, has only a single opening that serves as both mouth and anus.
Q6.
In which type of circulatory system are the cells and tissues directly bathed in blood?
[Animal-Kingdom] [class-xi]
Closed type
Open type
Mixed type
Absent type
Correct Option: B [ Open type ]
Remark: Explanation: In an open circulatory system, blood is pumped out of the heart and the cells and tissues are directly bathed in it.
Q7.
What type of symmetry is most commonly found in sponges?
[Animal-Kingdom] [class-xi]
Radial
Bilateral
Asymmetrical
Spherical
Correct Option: C [ Asymmetrical ]
Remark: Explanation: Sponges are mostly asymmetrical, meaning any plane passing through the center does not divide them into equal halves.
Q8.
Which group of animals typically exhibits radial symmetry?
[Animal-Kingdom] [class-xi]
Annelids and Arthropods
Platyhelminthes
Coelenterates, ctenophores, and echinoderms
Molluscs
Correct Option: C [ Coelenterates, ctenophores, and echinoderms ]
Remark: Explanation: Radial symmetry, where any plane passing through the central axis divides the organism into identical halves, is found in coelenterates, ctenophores, and echinoderms.
Q9.
Animals that can be divided into identical left and right halves in only one plane are said to have:
[Animal-Kingdom] [class-xi]
Radial symmetry
Asymmetry
Spherical symmetry
Bilateral symmetry
Correct Option: D [ Bilateral symmetry ]
Remark: Explanation: Bilateral symmetry is when the body can be divided into identical left and right halves in only one plane.
Q10.
Animals in which cells are arranged in two embryonic layers, an external ectoderm and an internal endoderm, are called:
[Animal-Kingdom] [class-xi]
Triploblastic
Diploblastic
Monoblastic
Coelomates
Correct Option: B [ Diploblastic ]
Remark: Explanation: Diploblastic animals are those in which the cells are arranged in two embryonic layers: an external ectoderm and an internal endoderm.
