Urochordata is marine and sedentary the number of species known is about 2,000. The body is enclosed in a test like a polysaccharide called tunicin. Their color is unrecognized and notochord is present in the tail region larva and disappears in the adult. The alimentary canal is complete and are ciliary feeders. Respiration takes place through numerous Gill slits which open into ectoderm lined cavity, the Atrium. They show open circulation and their heart is neurogenic and their blood flow shows a periodic reversal. They have special corpuscles vanadocytes to extract vanadium from seawater and store it in blood vessels. Sexual reproduction takes place in the budding process. Mostly they are hermaphrodite and their development is indirect, so take this quiz and know more about subphylum Urochordata.
1. Which protochordate is exclusively hermaphrodite?
A. Cyclostomata
B. Cephalochordata
C. Hemichordata ka
D. Urochordata
2. In which of the following jaws are absent?
A. Hagfish
B. Petromyzon
C. Both of these
D. Hippocampus
3. Which of the following is not a filter feeder?
A. Unio
B. Pila
C. Amphioxus
D. Balanglossus
4. What is the common name of hagfish?
A. Petromyzon
B. Myxine
C. Octopus
D. Frog
5. Which one not is a vertebrate?
A. Sea squirt
B. Seahorse
C. Frog
D. Fish
6. The hepatic portal system has evolved in......
A. Hemichordates
B. Urochordates
C. Cephalochordates
D. All of the above
7. The brain in vertebrates is enlarged.....
A. Anterior end of dorsal nerve cord
B. Posterior end of dorsal nerve cord
C. Anterior end of ventral nerve cord
D. Posterior end of ventral nerve cord
8. Scales of cyclostomes.....
A. Absent
B. Placoid
C. Ctenoid
D. Cycloid
9. Which characteristic is exclusively chordates?
A. Triploblastic
B. True coelom
C. Pharyngeal Gill slits
D. Bilateral symmetry
10. Which one not a class of Urochordate?
A. Ascidiacea
B. Thaliaceae
C. Larvacea
D. Ostracodermi
11. In lamprey's heart is ...
A. Single chambered
B. Two chambered
C. Three chambered
D. Absent
12. Ears of Petromyzontiformes have...
A. 1 semicircular canal
B. 2 semicircular Canal
C. 3 semicircular canal
D. No semicircular canal
13. In Ostracodermi, endoskeleton is...
A. Cartilagenous
B. Bony
C. Both of the above
D. Absent
14. Which one has no heart?
A. Cyclostomates
B. Urochordates
C. Cephalochordates
D. Osteichthyes
15. Which one of the following is a fossil?
A. Peripatus
B. Herdmania
C. Coprolite
D. Balanglossus
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