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NEET UG BIOLOGY MCQ: ANIMAL KINGDOM
1
Medium
1 of 1
Understanding
+4 | -1
S-1: Nervous system is poorly developed in echinoderms.
S-2: In echinoderms, ganglia and brain are absent.
S-2: In echinoderms, ganglia and brain are absent.
View answer and explanation
Correct option: A
Statement-1 is true, statement-2 is true, statement-2 is a correct explanation for statement-1.
Option A is correct because the poorly developed nervous system in echinoderms is directly due to the absence of a centralized brain and ganglia.
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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?