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NEET UG BIOLOGY MCQ: ANIMAL KINGDOM
1
Hard
1 of 1
Understanding
+4 | -1
[A]: Pearl is formed when a foreign particle gets inbetween shell and mantle.
[R]: The inner nacreous layer called mother of pearl is formed of layers of and concholin.
[R]: The inner nacreous layer called mother of pearl is formed of layers of and concholin.
View answer and explanation
Correct option: A
Both A and R are true and R is the correct explanation of A
Option A is correct because the pearl formation is indeed triggered by a foreign particle between the shell and mantle, and the nacreous layer (mother of pearl) is composed of calcium carbonate and conchiolin.
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b) A post anal tail is present in all adult urochordates.
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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?