Subphylum Urochordata

Q.

How many common characteristics are found in Chondrichthyes and Osteichthyes?

Q. Tunicates have

1. a vertebral column in the tail of the adult stage
2. a notochord in the tail of the larval stage
3. a notochord in the tail of the adult stage
4. a vertebral column in the tail of the larval stage

Q. Which among the following animals are exclusively marine?

1. Cyclostomes
2. Chondrichthyes
3. Protochordates
4. Osteichthyes

Q. Based on the notochord, chordates are classified into ancient and .

1. non-chordates
2. protochordates
3. invertebrates
4. vertebrates