Class Chondricthyes

Question 1

Class Chondricthyes

Common name?

Answer 1

Rays, sharks, skates

Question 2

Class Chondricthyes

Skeleton type?

Answer 2

Cartilaginous

Question 3

Class Chondricthyes

Number of heart chambers?

Answer 3

2 chambers
1 Atrium
1 Ventricle

Question 4

Class Chondricthyes

How do they control body temperature

Answer 4

Ectothermic - control body temperature behaviorally

Question 5

Endothermic

Answer 5

Control body temperature physiologically

Question 6

Class Chondricthyes
Placoid scale characteristics?
Modified?

Answer 6

Stratified squamous epithelium
Shed constantly

Some are modified into teeth

Question 7

Class Chondricthyes

Gas exchange structure?

Answer 7

Gills

Question 8

Class Chondricthyes

Reproduction type?

Answer 8

Internal fertilization

Question 9

Class Chondricthyes

Ovoviviparous

Answer 9

Retain embryos in the female’s body

No placenta

Question 10

Class Chondricthyes

Oviparous

Answer 10

Lay eggs

Question 11

Class Chondricthyes

Viviparous

Answer 11

Retain embryos and transfer nutrients via placenta

Question 12

Class Chondricthyes

Body form of sharks is same for 100,000,000 years

Answer 12

Stabilizing selection

Question 13

Class Chondricthyes

Heterocercal tail

Answer 13

Spinal cord in dorsal lobe of tail

Question 14

Class Chondricthyes

Lack:

Answer 14

Swim bladder for buoyancy

Question 15

Class Chondricthyes

How do they stay buoyant?

Answer 15

Retain low density oils

Question 16

Class Chondricthyes

Living environment?

Answer 16

Hypertonic environment (more solutes)

Question 17

Class Chondricthyes

How do they match tonicity of salt water?

Answer 17

Retain metabolic wastes in salt form