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Coelenterates (Class - XI)

Description: Proteins
Number of Questions: 15
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Tags: coelenterates Phylum Coelenterata Phylum Cnidaria
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In which class of coelenterates are true jellyfish found?

  1. Hydrozoa

  2. Scyphozoa

  3. Anthozoa

  4. Cubzoa


Correct Option: B
Explanation:

True jellyfish are found in class Scyphozoa of coelenterates.

Which class of coelenterates exists only in polyp form?

  1. Hydrozoa

  2. Scyphozoa

  3. Anthozoa

  4. Cubozoa


Correct Option: C
Explanation:

Anthozoa exist only in the form of polyp.

What is the morphism of hydra called?

  1. Dimorphism

  2. Trimorphism

  3. Polymorphism

  4. Monomorphism


Correct Option: C
Explanation:

Hydra exhibits polymorphism.

Which coelenterate is known as Portuguese man of war?

  1. Aurelia

  2. Physalia

  3. Obelia

  4. Velella


Correct Option: B
Explanation:

Physalia is known as Portuguese man of war.

In which coelenterate are bladder-like pnumatophores found?

  1. Aurelia

  2. Obelia

  3. Physalia

  4. Palegia


Correct Option: C
Explanation:

Bladder-like pneumatophores are found in physalia.

Which coelenterate posseses hydrorhiza and hydrocauli filaments?

  1. Aurelia

  2. Obelia

  3. Hydra

  4. Physalia


Correct Option: B
Explanation:

Hydrorhiza and hydrocauli filaments are found in obelia. 

Which kind of zooids are responsible for capturing prey?

  1. Gonozooids

  2. Dactylozooids

  3. Gastrozooids

  4. Tentaculozooids


Correct Option: C
Explanation:

Gastrozooids bear tentacles with nematocysts.

Which of the following entities form(s) coral reefs?

  1. Medusa

  2. Polyp

  3. Sponges

  4. Protists


Correct Option: B
Explanation:

Coral reefs are formed by polyps.

Which of the following classes of coelenterates form(s) corals?

  1. Hydrozoa

  2. Scyphozoa

  3. Anthozoa

  4. All of the above


Correct Option: C
Explanation:

Some members of anthozoa bear an exoskeleton.

Which of the following is/are freshwater polyp(s)?

  1. Obelia

  2. Hydra

  3. Metridium

  4. Aurelia


Correct Option: B
Explanation:

Hydra is a freshwater polyp.

In which organism are nectophores located at the apical end of the body?

  1. Physalia

  2. Diphyes

  3. Velella

  4. Porpita


Correct Option: B
Explanation:

In diphyes, colonies are linear with one or more nectophores located at the apical end.

Which of the following organs act(s) as an organ of defence in coelenterates?

  1. Nematocysts

  2. Palcopils

  3. Hydrocauli

  4. Tentacles


Correct Option: D
Explanation:

Tentacles are the organs of defence in coelenterates. They are also used to catch food.

Which layer is called gastroderm layer of coelenterates?

  1. Outer layer

  2. Middle layer

  3. Inner layer

  4. Lining of heart


Correct Option: C
Explanation:

The inner layer of coelenterates is called gastroderm.

What is the cavity found in the body of coelenterates called?

  1. Osculum

  2. Velum

  3. Lenteron

  4. Medusa


Correct Option: C
Explanation:

There is only one cavity found in the body of coelenterates.

What is the larval form of coelenterates called?

  1. Zoea

  2. Naupilus

  3. Planula

  4. Parva


Correct Option: C
Explanation:

Planula is the single-celled larval form of coelenterates.

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