Class Cyclostomata

Q.

Number of gill slits in cyclostomes is

1. 6-15 pairs

2. 9-10 pairs

3. 15-30 pairs

4. 5-16 pairs

Q.

Jawless, exclusive marine bottom dwelling ectoparasites with cartilaginous vertebral column are grouped under the class:

1. Cephalochordata

2. Urochordata

3. Cyclostomata

4. Osteichthyes

Q. Which one of the following pairs of animals comprises 'Jawless fishes'?

1. Lampreys and eels
2. Lampreys and hagfishes
3. Mackerels and rohu
4. Guppies and hagfishes

Q. Choose the correct statement.

1. All Pisces have gills covered by an operculum.
2. All mammals are viviparous.
3. All cyclostomes do not possess jaws and paired fins.
4. All reptiles have a three chambered heart.

Q. Members of agnatha exhibit________

1. sucking mouth with jaws
2. migration to marine water
3. similar exoskeleton like fishes
4. similar circulatory system as that of earth worm

Q. Class cyclostomata includes all .

1. jawed vertebrates
2. jawed invertebrates
3. jawless vertebrates
4. jawless invertebrate

Q. Choose the correct statement.

1. Starfish is radially symmetrical with lateral line system
2. Jellyfish is radially symmetrical with polyploid body form
3. Lamprey is bilaterally symmetrical with circular jawless mouth which is used for sucking
4. Silverfish is bilaterally symmetrical and marine

Q. Choose the correct statement.

1. All Pisces have gills covered by an operculum
2. All mammals are viviparous
3. All cyclostomes do not possess jaws and paired fins
4. All reptiles have a three-chambered heart

Q. A marine jawless fish, which lays eggs in fresh water and whose larvae after metamorphosis return to the ocean is :

1. Eptatretus
2. Petromyzon
3. Myxine
4. Neomyxine

Q. The vertebral column is cartilaginous in:

1. Osteichthyes
2. Cyclostomes
3. Urochordates
4. Cephalochordates