Fishes

Question 1

What fins did fishes evolve?

Answer 1

Pectoral and pelvic fins

Question 2

What did the fins do?

Answer 2

Paired fins gave fishes more control of body movement while the tail fin gave greater thrust when swimming

Question 3

What are the two major groups of fishes?

Answer 3

Chondrichthyes

Osteichthyes

Question 4

What are Chondrichthyes?

Answer 4

Modern sharks and rays; skeleton made of strong resilient cartilage

Question 5

What are Osteichthyes?

Answer 5

Evolved fish with a skeleton made of bone

Question 6

What steps does the food follow in the digestive tract of a shark?

Answer 6

1. Mouth
2. Pharynx
3. Esophagus
4. Stomach
5. Pyloric ceca
6. Pancreas/liver
7. Intestine
8. Anus

Question 7

How to fish breathe?

Answer 7

They use their gills to exchange gasses by pulling oxygen rich water in through their mouths, pumping it over their gill filaments, and pushing oxygen poor water out through openings in the sides of the pharynx

Question 8

How does blood circulate in a fish?

Answer 8

It goes in a single loop around the body from the heart to the gills, from the gills to the rest of the body and then back to the heart

Question 9

What are the four parts of the heart?

Answer 9

Sinus venosus
Atrium
Ventricle
Bulbous arteriosis

Question 10

What is the sinus venosus

Answer 10

A chamber that receives blood and forces it into the atrium

Question 11

What is the atrium

Answer 11

Receives oxygen deprives blood from the sinus venosus

Question 12

What is the function of that ventricle?

Answer 12

It pumps blood to the gills/lungs

Question 13

What is the bulbous arteriosis?

Answer 13

Chamber that receives blood from the ventricle before heading throughout body through aorta

Question 14

The kidneys of salt water fishes pump out concentrated urine

Answer 14

Low water content, high salt

Question 15

The kidneys of fresh water fishes pump out dilute urine

Answer 15

High water content, low salt

Question 16

What do the olfactory bulbs do?

Answer 16

They’re involved with the sense of smell or olfaction

Question 17

What does the cerebrum do?

Answer 17

It’s responsible for all the voluntary activities but primarily processes the sense of smell

Question 18

What does the optic lobe process?

Answer 18

Sight

Question 19

What does the cerebellum do?

Answer 19

Coordinates body movement

Question 20

What does the medulla oblongata do?

Answer 20

It controls the function of many inside organs

Question 21

Starting with the weird diving path at the top, what order does everything go in the fish brain?

Answer 21

Olfactory bulbs 
Cerebrum
Optic lobe
Cerebellum
Medulla oblongata

Question 22

What do fish use the lateral line system for?

Answer 22

To sense the motion of other fishes/predators

Question 23

What is the function of the swim bladder?

Answer 23

It’s full of gas and controls buoyancy

Question 24

How do fish move?

Answer 24

They contract paired sets of muscles in either side of the backbone

Question 25

What are agnathan fishes?

Answer 25

Jawless

Question 26

Do jawless fishes have a bone or cartilage skeleton?

Answer 26

Cartilage

Question 27

What are the two classes of jawless fishes?

Answer 27

Lamprey and hagfish

Question 28

Fish whose embryos develop and hatch outside the mothers body

Answer 28

Oviparous

Question 29

The eggs stay in the mothers body after internal fertilization and use the yolk from the egg for nourishment

Answer 29

Ovoviviparous

Ex: guppies

Question 30

The eggs stay in the mothers body after internal fertilization and use the mothers body for nourishment

Answer 30

Viviparous (this species is born alive)

Question 31

What is in the class chondrithyes?

Answer 31

Sharks
Rays
Skates
Sawfish
Chimaeras

Question 32

Fish that spend most of their lives in the ocean. It migrate to fresh water to breed

Answer 32

Anadromous

Question 33

Class sarcopterugii

Answer 33

Lobe-finned fishes are ancestors to the tetrapods and have lungs and gills

Question 34

How many living species of bony fishes are not classified as ray-finned?

Answer 34

7

Question 35

Example of class actinopterygii

Answer 35

Bichir
Atlantic sturgeon
Paddlefish