Choose the correct answers from the alternatives given.
The three defining characteristics of chordates are

segmentation/dorsal hollow nerve cord/gill arches or pharyngeal pouches

No worries! We‘ve got your back. Try BYJU‘S free classes today!

dorsal hollow nerve cord/notochord/bilateral symmetry

No worries! We‘ve got your back. Try BYJU‘S free classes today!

well-developed coelom/gill arches or pharyngeal pouches/notochord

No worries! We‘ve got your back. Try BYJU‘S free classes today!

gill arches or pharyngeal pouches/dorsal hollow nerve cord/notochord

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D gill arches or pharyngeal pouches/dorsal hollow nerve cord/notochord
In chordates, four common features appear at some point during development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. The nerve cord is
Single, hollow nerve cord beneath the dorsal surface; in vertebrates, it differentiates into the brain and spinal cord. The notochord is a flexible rod on the dorsal side of the gut, present at one stage in all chordates; displaced in the vertebrates by the vertebral column that forms around the nerve cord. Pharyngeal slits (pouches) connect pharynx (between mouth and oesophagus) with outside. The post-anal tail extends beyond anus; present at least in embryo; regresses into tail bone in humans.
So, the correct option is, 'gill arches or pharyngeal pouches/dorsal hollow nerve cord/notochord'.

Suggest Corrections

Similar questions

Q. Phylum Chordata is characterised by the presence of
A. notochord
B. dorsal hollow nerve cord
C. paired pharyngeal gill slits

Animals with a double ventral notochord, dorsal nerve cord, pharyngeal gill slits and a post anal tail are placed in the highly evolved phylum called_____.

Q. Animals of this phylum have a characteristic feature of presence of notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits. Within this phylum is an advanced group called as vertebrates which include fish, amphibians, reptiles, birds and mammals.

Name the phylum in which dorsal nerve tube, notochord and pharyngeal gill clefts are present.

Q. Assertion :Lancelets are jawless, primitive fish like vertebrates. Reason: In lancelets notochord, tubular nerve cord and pharyngeal gills slits arePresent throughout their life.

Join BYJU'S Learning Program

Choose the correct answers from the alternatives given.The three defining characteristics of chordates are

Choose the correct answers from the alternatives given.
The three defining characteristics of chordates are