NEET Biology question
Consider the following statements (A-D), each with one or two blanks.
A. Four characters of chordates are the presence of (i), dorsal hollow nervous system, (ii) and muscular tail. B. Agnatha are the most primitive craniates. They are commonly called (iii) vertebrates. C. Electric ray belongs to Class (iv) while sea horse belongs to Class (v). D. (vi) are also defined as feathered bipeds. These have a (vii) gland on the tail.
Which one of the following options correctly fills any two of the given blanks?
Solution
The four fundamental chordate characters are notochord (i), dorsal hollow nerve cord, pharyngeal gill slits (ii) and a post-anal muscular tail — so both blank-fills in option (b) are correct. In option (a), (iii) "jawless" is correct but (iv) should be Chondrichthyes, not Osteichthyes (electric ray is
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