Question

Phylum Chordata includes organisms having (at least at some stage from zygote to adult)-
(i) a notochord, (ii) a terrestrial habitat, (iii) pharyngcal gills, (iv) a ventral heart with a hepatic portal system, (v) unpaired limbs

• A. (i), (ii) and (iii) are correct
• B. (i), (ii) and (iv) are correct
• C. All are correct
• D. (i), (iii), (iv) are correct

Answer 1

The correct option is D (i), (iii), (iv) are correct

Animals in the phylum Chordata are characterized by the presence of stages in embryonic life-
The presence of a notochord, which provides skeletal support, and develops into the vertebral column in vertebrates. The dorsal hollow nerve cord (develops into CNS). Pharyngeal slits are openings int he pharynx that develops into gill arches in the bony fish and into the jaw and inner ear in terrestrial animals. Have closed circulatory system with a ventrally placed heart and a hepatic portal system.
Thus, the correct answer is option D.