1. How many of the following belongs to the subphylum cephalochordate?
Ascidia, Salpa, Doliolum, Branchiostoma
a) 1
b) 2
c) 3
d) 4
Explanation: 1
2. The other name of Branchiostoma is
a) Amphioxus
b) Lancelet
c) Both (a) and (b)
d) None of these
Explanation: Both (a) and (b)
3. Select the incorrect statement from the following:
a) In vertebrates, the notochord is replaced by cartilaginous or bony vertebral column
b) In cephalochordates, the notochord is extended from head to tail region and is persistent
throughout life.
c) Protochordates are exclusively marine.
d) Notochord is present in tail of adult in urochordata.
Explanation: "Notochord is present in tail of adult in urochordata". This is incorrect statement.
4. Vertebrates have
a) Ventral muscular heart with 3, 2 or 4 chamber.
b) Kidneys for excretion and osmoregulation.
c) Paired appendages which may be fins or limbs.
d) All of these
Explanation: All of these
5. Which of the following is exoskeleton in vertebrates?
a) Scales
b) Feathers
c) Hair
d) Any of the above
Explanation: Any of the above
6. All living members of which class is ectoparasite on fishes?
a) Turbellaria
b) Chondrichthyes
c) Cephalopoda
d) Cyclostomata
Explanation: Cyclostomata
7. Which of the following are characters of cyclostomata?
a) 6–15 pairs of gill slits is present for respiration
b) Sucking and circular mouth without jaws
c) Body is devoid of scales and paired fins
d) All of these
Explanation: All of these
8. Which of the following organism possess cartilaginous cranium, vertebral column, closed
type of circulatory system, which helps them migrate to fresh water for spawning?
a) Ascidia
b) Scoliodon
c) Petromyzon
d) All of these
Explanation: Petromyzon
9. Which of the following are marine but migrate for spawning to fresh water. After spawning,
within a few days, they die. Their larvae, after metamorphosis, return to ocean. Specify
the correct one.
a) Petromyzon (Lamprey)
b) Myxine (Hagfish)
c) Scoliodon
d) Both (a) and (b)
Explanation: Both (a) and (b)
10. Which of the following is correct about cyclostomes?
a) Ectoparasite on fishes during their adult stage.
b) Skin with scales and contain unicellular mucous gland.
c) One kidney for excretion.
d) Heart is two chambered and possess 4 pair of gill slits for respiration.
Explanation: Ectoparasite on fishes during their adult stage.