Name of the chordate has been derived from the word chord means…….
a) rope or thread
b) shell
c) brain and spine
d) skeleton
Which of the following is the unique character of chordates?
a) all the chordates have notochord
b) all the chordates are coelomates
c) all the chordates are triploblastic
d) all chordates have vertebral column
Explanation: in lower vertebrates it is retained while in higher it is replaced by vertebral column
Which of the following is/are true about the animals of phylum chordata?
a) all chordates have a central, dorsal, hollow nervous system above notochord
b) all chordates develop gill slits at least in the embryonic stage
c) all chordates have a dorsal stiff rod called notochord
d) all of these
Explanation: in fish and amphioxus, these gills still functional
Phylum chordata has been divided into ………main divisions.
a) two
b) three
c) four
d) five
Explanation: 1. Protochordata or Acrania and 2. Craniata
Phylum chordata has been divided into ………sub phylum.
a) two
b) three
c) four
d) five
Explanation: 1. Urochordata, 2. Cephalochordate and 3. Vertebrata
The chordates having no cranium are called……..
a) Protochordata
b) Acrania
c) Craniata
d) both a and b
Explanation: also called lower chordates
