The following are the statements about non-chordates:
A. Pharynx is perforated by gill slits.
B. Not

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Question

The following are the statements about non-chordates:
A. Pharynx is perforated by gill slits.
B. Notochord is absent.
C. Central nervous system is dorsal.
D. Heart is dorsal if present.
E. Post anal tail is absent.
Choose the correct answer from the options given below:
(1) A, B and D only
(2) A, C and E only
(3) B, D and E only
(4) B, C and D only

Accepted Answer

Correct Answer: C — B, D and E onlyStep-by-step Solution:Non-chordates are animals without a notochord. Their characteristics (general) are:A. Pharynx perforated by gill slits: This is a chordate characteristic (present in urochordates, cephalochordates, and vertebrates). Non-chordates do not have pharyngeal gill slits. Hence, A is false.B. Notochord is absent: True for non-chordates.C. Central nervous system is dorsal: In chordates, the CNS is dorsal; in non-chordates, it is typically ventral (e.g., annelids, arthropods). Hence, C is false.D. Heart is dorsal if present: In many non-chordates (e.g., arthropods, annelids), the heart is dorsal. This is generally true.E. Post anal tail is absent: True; post-anal tail is a chordate feature.Thus, B, D, and E are correct, corresponding to option C.Key Concepts: Differences between chordates and non-chordates: notochord, pharyngeal slits, dorsal hollow nerve cord, post-anal tail, heart position.

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