What are the true characteristics of class Anthozoa?

A. Mesoglea fibrous, polypoid forms only

B. Mesoglea non-fibrous, both polypoid and medusoid forms

C. Mesoglea fibrous, medusoid forms only

D. Mesoglea non-fibrous, polypoid forms only

Everyday Science · Zoology & Animal Kingdom · page 23 of 46

Classes of Animals MCQs with Answers

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Classes of Animals MCQs (221–230)

10 MCQs with answers and a short one-liner. Hide answers to test yourself.

Past paper MCQs in this chapter · See all past papers

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221.
The organism having wings with claws?
Correct Answer: D. Archaeopteryx
One-liner
The organism having wings with claws is Archaeopteryx, a transitional fossil between reptiles and birds.
222.
Which invertebrate has a pseudocoelom?
Correct Answer: B. Nematodes
One-liner
Nematodes (roundworms) are invertebrates that possess a pseudocoelom, a fluid-filled body cavity that is not fully lined by mesoderm.
223.
Past Paper MCQ
What is the world's largest living mammal?
Correct Answer: D. Blue Whale
One-liner
The Blue Whale is the world's largest living mammal, reaching lengths of up to 30 meters and weighing as much as 200 tons.
224.
An example of crustacean parasitic on fish is _?
Correct Answer: C. Argulus
One-liner
An example of a crustacean parasitic on fish is Argulus, commonly known as the fish louse.
225.
Aquatic arthropods respire through _?
Correct Answer: A. Gills
One-liner
Aquatic arthropods respire through gills.
226.
Sea horse is included in ?
Correct Answer: A. Pisces
One-liner
Sea horse belongs to the class Pisces (fishes).
227.
What are the true characteristics of class Anthozoa?
Correct Answer: A. Mesoglea fibrous, polypoid forms only
One-liner
The true characteristics of class Anthozoa are mesoglea fibrous and polypoid forms only.
228.
Which of the following are cold-blooded vertebrates?
Correct Answer: A. Fish and Amphibians
One-liner
Cold-blooded vertebrates include fish, amphibians, and reptiles, while birds are warm-blooded.
229.
How do Chondrichthyes and Osteichthyes differ?
Correct Answer: C. Presence of spiracles
One-liner
Chondrichthyes (cartilaginous fish) possess spiracles (small openings behind the eyes for water intake), while Osteichthyes (bony fish) generally lack them.
230.
Which one of the following animals possesses an open circulatory system?
Correct Answer: B. Grasshopper
One-liner
The Grasshopper possesses an open circulatory system, in which blood (hemolymph) flows freely within body cavities rather than being confined to blood vessels.

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Classes of Animals MCQs with Answers

Classes of Animals MCQs (221–230)

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