Class XI · Biology practice

Animal Kingdom MCQs

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Q111.

The body cavity which is lined by mesoderm is called a __________.

[Animal-Kingdom] [class-xi]

Correct option: C   [ Coelom ]

Remark: A coelom is a true body cavity completely lined by mesodermal tissue.
Q112.

Which of the following is an example of a coelomate animal group? __________

[Animal-Kingdom] [class-xi]

Correct option: D   [ Annelids ]

Remark: Annelids (segmented worms) are coelomates possessing a true body cavity lined by mesoderm.
Q113.

Aschelminthes are characterized by the presence of a body cavity that is not lined by mesoderm, known as a __________.

[Animal-Kingdom] [class-xi]

Correct option: B   [ Pseudocoelom ]

Remark: Aschelminthes (roundworms) have a pseudocoelom — a body cavity derived from blastocoel and not fully lined by mesoderm.
Q114.

The phenomenon where the body is externally and internally divided into segments with a serial repetition of some organs is known as __________.

[Animal-Kingdom] [class-xi]

Correct option: B   [ Metamerism ]

Remark: Metamerism (metameric segmentation) is the serial repetition of body segments and organs, as seen in annelids.
Q115.

What is the rod-like structure derived from mesoderm, formed on the dorsal side during embryonic development in some animals? __________

[Animal-Kingdom] [class-xi]

Correct option: C   [ Notochord ]

Remark: The notochord is a mesodermal rod that provides support in chordate embryos and in some in adults (e.g., cephalochordates).
Q116.

Members of Phylum Porifera are commonly known as __________.

[Animal-Kingdom] [class-xi]

Correct option: C   [ Sponges ]

Remark: Members of Phylum Porifera are commonly called sponges.
Q117.

The water transport or canal system in sponges is helpful for all the following functions EXCEPT __________.

[Animal-Kingdom] [class-xi]

Correct option: D   [ Anchorage ]

Remark: The canal system in sponges helps in feeding, respiration, and waste removal; anchorage is not a function of the canal system.
Q118.

The central cavity in sponges, lined by choanocytes or collar cells, is called the __________.

[Animal-Kingdom] [class-xi]

Correct option: C   [ Spongocoel ]

Remark: Water enters through ostia into the spongocoel (central cavity) and exits via the osculum in sponges.
Q119.

The body of a sponge is supported by a skeleton made up of __________.

[Animal-Kingdom] [class-xi]

Correct option: C   [ Spicules or spongin fibres ]

Remark: Sponges are supported by a skeleton composed of spicules (calcareous or siliceous) or spongin fibres.
Q120.

The name Cnidaria is derived from the presence of __________.

[Animal-Kingdom] [class-xi]

Correct option: C   [ Cnidoblasts or cnidocytes ]

Remark: The name Cnidaria is derived from the presence of specialized stinging cells called cnidoblasts or cnidocytes.
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