Statement (S) Lancelets are jawless primitive fish like vertebrates
Statement (R) In lancelets notochord tubular nerve cord and pharyngeal gill slits are present the throughout their life

State whether the following statement is True or False. Correct the false statement. In non-chordates, pharyngeal gill-slits are present.

The statements given below highlight some of the chordates features. They have a hollow nervous system which is present ventrally above the notochord. II. They prossess four pharyngeal gill slits present in the from of perfortions on the lateral sides of pharynx. III. Epidermis is made up of stratified epithelium. IV. They have two pairs of appendages, one pair at the begnning of the trunk and other in the middle of the trunk. V. They have a closed vascular system.

Consider the following structures :(i) Notochord(ii) Nerve cord(iii) Pharyngeal gill slits(iv) Tail.How many features are present in larva urochordates?

Vertebrates are characterized by (i) presence of true coelom (ii) presence of notochord (iii) a ventrally placed heart (iv) the pharyngeal gill slits at some stage in life cycle (v) RBCs.

Read the following statement and select the correct option : (a) In lancelets notochord extends from head to tail region and is througout their life . (b) In tunicates ,notochord is present only in the larval tail .

Read the following statement and select the correct option : (a) In lancelets notochord extends from head to tail region and is througout their life . (b) In tunicates ,notochord is present only in the larval tail .

Which of the following statements is correct for the phylum whose organisms are characterized by the presence of a dorsal hollow nerve cord and paired pharyngeal gill slits ?

Which of the following statements is correct for the phylum whose organisms are characterized by the presence of a dorsal hollow nerve cord and paired pharyngeal gill slits ?