Unit 1? Fish mainly

Question 1

Bony fish tail type

Answer 1

Homocercal

Question 2

Why homocercal tail?

Answer 2

Forward movement, swim bladder increases buoyancy

Question 3

Shark tail type

Answer 3

Heterocercal

Question 4

Why heterocercal tail?

Answer 4

No swim bladder, het. tail and oil increase buoyancy due to tendency to sink

Question 5

What is a lower vertebrate?

Answer 5

Evolved first, primitive

Question 6

What is a higher vertebrate?

Answer 6

Evolved later, derived

Question 7

Order of evolution?

Answer 7

Fish, amphibian, reptiles, birds, mammals

Question 8

Tetrapods

Answer 8

Amphibians, reptiles, birds, mammals, all but fish

Question 9

Fishes

Answer 9

Everything but amphibians, reptiles, birds, mammals

Question 10

Agnathans

Answer 10

No jaw: hagfishes, lamprey

Question 11

Gnathostomes

Answer 11

Have jaws: types are chondrichthyes and osteichthyes

Question 12

Chondrichthyes

Answer 12

Cartilaginous fishes: sharks, rays, skates, chimaeras

Question 13

Osteichthyes

Answer 13

Bony fishes with swim bladder and homocercal tail

Question 14

Scale types

Answer 14

Placoid, cycloid, ctenoid, ganoid

Question 15

Scale type of bass

Answer 15

ctenoid

Question 16

Scale type of salmon

Answer 16

cycloid

Question 17

Scale type of gar

Answer 17

Ganoid

Question 18

Scale type of sharks

Answer 18

Placoid