NEET UG BIOLOGY MCQ: ANIMAL KINGDOM

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Which of the following class is being correctly described by given statements (i – iv)?
(i) All living members of this class are ectoparasites on some fishes
(ii) They have a sucking and circular mouth without jaws.
(iii) Circulation is of closed type
(iv)They are marine but migrate for spawning to fresh water. After spawing, with in a few days they die.

View answer and explanation

Correct option: A

Cyclostomata

Option A is correct because the described features are characteristic of the class Cyclostomata (jawless fishes).

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Which one of the following in birds, indicates their reptilian ancestry The presence of the tube feet is a characteristic feature of the phylum Respiratory organs of Saccoglossus are Which of the following statements are true for the phylum – Chordata?
a) In Vertebrata the notochord is replaced by a cartilaginous or bony vertebral column in the adult.
b) A post anal tail is present in all adult urochordates.
c) In Cephalochordata, notochord is present only in larval tail.
d) Vertebrates have a ventral muscular heart with two, three or four chambers. Read the following organisms given in the below

Tapeworm, Roundworm, Hookworm, Threadworm

How many of the above mentioned parasites causes inflammation of the intestinal tract? What is left when bath-sponges dries up?