Class Chondrichthyes

Q.

What are cycloid and ctenoid scales?

Q. _________ fins bear claspers in sharks.

1. Pectoral
2. Caudal
3. Dorsal
4. Pelvic

Q.

What Is The Main Difference Between Placoid And Ctenoid Scales?

Q.

Do scales grow back on fish?

Q.

Most fishes and amphibians

1. are viviparous

2. are ovoviviparous

3. show internal fertilization

4. are oviparous

Q.

What type of scales does Perch have?

Q.

Mention any eight characteristics of class chondrichthyes.

Q. Which among the following is absent in sharks?

1. Gill cover
2. Gill slits
3. Scales
4. Pelvic fins

Q.

Ventral mouth is seen in

1. Scoliodon

2. Labeo

3. Catla

4. Salamandra

Q.

Does salmon have cycloid scales?

Q.

What type of scales does lungfish have?

Q. The type of scales found in sharks are

1. ctenoid
2. cycloid
3. placoid
4. ganoid

Q. The skeleton of the members of the class Chondrichthyes is made up of

1. bones
2. cartilages
3. muscles
4. calcium spines

Q. Identify the class of vertebrates which is characterised by the presence of cartilaginous endoskeleton, placoid scales, two chambered heart and poikilothermic.

1. Cyclostomata
2. Chondrichthyes
3. Osteichthyes
4. Amphibia

Q. Poikilothermic organisms can maintain a constant body temperature irrespective of the external temperature.

1. False
2. True

Q.

Teeth of cartilagenous fishes are modified

1. Ganoid scales

2. Cycloid scales

3. Cosmoid scales

4. Placoid scales

Q. Operculum is absent in

1. Labeo
2. Pristis
3. Exocoetus
4. Betta

Q. Jaws appeared for the first time in the class ___________.

1. Cyclostomata
2. Chondrichthyes
3. Osteichthyes
4. Amphibia

Q. Match the Chondrichthyes!

1. Electric organ
2. Poison sting
3. Dog fish
4. Torpedo
5. Scoliodon
6. Trygon

Q.

Identify the following chondrichthyes fishes.

1. 1 - Trygon, 2 - Scoliodon, 3 - Pristis, 4 - Carcharodon

2. 1 - Pristis, 2 - Carcharodon, 3 - Trygon, 4 - Scoliodon

3. 1 - Scoliodon, 2 - Pristis, 3 - Carcharodon, 4 - Trygon

4. 1 - Carcharodon, 2 - Trygon, 3 - Scoliodon, 4 - Pristis