Mollusca Lab Questions

Question 1

What are the major classes?

Answer 1

1. Bivalvia
2. Cephalopoda
3. Gastropoda

Question 2

What type of cavity do they have?

Answer 2

coelomate

Question 3

How many germ layers?

Answer 3

3

Question 4

How do they reproduce?

Answer 4

sexually

Question 4

How do they respire?

Answer 4

Gills (maximise oxygen extraction from water)

Question 4

Type fo digestive tract?

Answer 4

complete

Question 5

What type of circulatory system?

Answer 5

open circulatory system

Question 6

Define open circulatory system.

Answer 6

Blood does not stay in vessels or heart at all times, goes out into the cavity

Question 7

Define closed circulatory system.

Answer 7

• blood remains in blood vessels and heart
• more advanced
• we are closed circulatory

Question 8

Fuction of mantle in bivalve?

Answer 8

Produce a shell

Question 9

Function of gills in bivalve?

Answer 9

1. respiration
2. filter feeding
3. brooding of young

Question 10

Function of digestive glands in bivalve?

Answer 10

produces bile and digestive enzymes to digest food.

Question 11

Fucntion of adductor mucles in bivalve?

Answer 11

Brings shell together and keep it closed

Question 12

Visceral mass

Answer 12

The visceral mass contains the digestive, excretory, and reproductive organs. Is the bulk of the mollusk that is in the shell

Question 13

Mantle cavity

Answer 13

Formed by the mantle skirt, a double fold of mantle which encloses a water space. Contains the gills, anus, nephridiopores, and gonopores. Functions as a respiratory chamber in most mollusks.

Question 14

What are ctenidia?

Answer 14

Gills

Question 15

What is the radula?

Answer 15

A band of teeth for grinding food (bivalva lack this)

Question 16

Siphon

Answer 16

Allows water to flow into and out of mollusk

Question 17

Valves

Answer 17

The hard halves or shell