Class XI · Biology practice

Animal Kingdom MCQs

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Q141.

In molluscs, a soft and spongy layer of skin that forms over the visceral hump is called the __________.

[Animal-Kingdom] [class-xi]

Correct option: A   [ Mantle ]

Remark: The mantle is a soft layer that covers the visceral hump in molluscs and secretes the calcareous shell.
Q142.

The mouth of a mollusc contains a file-like rasping organ called the __________.

[Animal-Kingdom] [class-xi]

Correct option: A   [ Radula ]

Remark: Radula is a file-like rasping organ in the mouth of molluscs used for scraping or cutting food.
Q143.

The body cavity in echinoderms is known as the __________.

[Animal-Kingdom] [class-xi]

Correct option: A   [ Coelom ]

Remark: Echinoderms are coelomate animals with a body cavity called the coelom.
Q144.

The water vascular system of echinoderms is important for __________.

[Animal-Kingdom] [class-xi]

Correct option: C   [ Locomotion, food capture, and respiration ]

Remark: The water vascular system in echinoderms functions in locomotion, food capture, and respiration.
Q145.

The endoskeleton of echinoderms is made of calcareous __________.

[Animal-Kingdom] [class-xi]

Correct option: C   [ Ossicles ]

Remark: Echinoderms possess an endoskeleton of calcareous ossicles.
Q146.

In echinoderms, fertilisation is usually __________.

[Animal-Kingdom] [class-xi]

Correct option: B   [ External ]

Remark: In echinoderms, sexes are separate and fertilisation usually occurs externally.
Q147.

The larvae of echinoderms exhibit __________ symmetry, while adults exhibit __________ symmetry.

[Animal-Kingdom] [class-xi]

Correct option: B   [ Bilateral, Radial ]

Remark: Larvae of echinoderms have bilateral symmetry while the adults are radially symmetrical.
Q148.

Hemichordata was earlier considered a sub-phylum of Chordata due to the presence of a structure called the __________.

[Animal-Kingdom] [class-xi]

Correct option: B   [ Stomochord ]

Remark: Hemichordates have a stomochord in the collar region, once thought to be homologous to the notochord.
Q149.

The body of hemichordates is divided into __________ regions.

[Animal-Kingdom] [class-xi]

Correct option: B   [ Three ]

Remark: Hemichordates have a body divided into proboscis, collar, and trunk regions.
Q150.

The fundamental features of chordates include a notochord, a dorsal hollow nerve cord, and __________.

[Animal-Kingdom] [class-xi]

Correct option: B   [ Gill slits ]

Remark: Chordates are defined by the presence of a notochord, dorsal hollow nerve cord, and pharyngeal gill slits.
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