2023 Animal KingdomPhylum Chordata – Salient Features Medium Question 1 of 2 in Phylum Chordata – Salient Features

Select the correct statements with reference to chordates. A. Presence of a mid-dorsal, solid and double nerve cord. B. Presence of closed circulatory system. C. Presence of paired pharyngeal gills D. Presence of dorsal heart E. Triploblastic pseudocoelomate animals. Choose the correct answer from the options given below:

A C, D and E only
B A, C and D only
C B and C only
D B, D and E only

The answer is C.

Solution

Chordates have a closed circulatory system and paired pharyngeal gill slits; the nerve cord is dorsal and hollow and the heart is ventral.

Phylum Chordata are characterised by the presence of a notochord, a dorsal hollow nerve cord, and paired pharyngeal gill slits. These are triploblastic, coelomate with organ-system level of organisation. Vertebrates have a ventral muscular heart with two, three or four chambers.

Concept characteristics of chordates

Phylum Chordata – Salient Features in past papers

2 questions from this chapter have appeared across 2 exam years.