mollusca

Question 1

Mollusca

Answer 1

means “soft body”

Question 2

tube used to take in water (oxygen) and food.

Answer 2

siphon

Question 3

meaning of Gastropoda

Answer 3

stomach foot

Question 4

meaning of cephalopoda

Answer 4

head-foot

Question 5

tissue that secretes a shell

Answer 5

mantle

Question 6

Blood circulation is of this design

Answer 6

an open circulatory system

Question 7

tongue-like structure with tiny bone plates

Answer 7

radula

Question 8

type of circulation seen in this group

Answer 8

a closed circulatory system

Question 9

structure used for locomotion

Answer 9

a foot

Question 10

This structure can be made into an anchor or extended. by diverting blood into a particular sinus

Answer 10

foot

Question 11

this structure produces a lubricating slime to aid in movement

Answer 11

the foot

Question 12

feature that is highly evolved and approaches that of mammals in ability

Answer 12

the eyes

Question 13

material shells are made of

Answer 13

calcium carbonate

Question 14

gametes are spread into the water for fertilization and possible distribution

Answer 14

broadcast fertilization

Question 15

term for organisms like snails which possess both gametes for fertilization

Answer 15

hermaphridite

Question 16

the foot has specialized into these structures

Answer 16

what are arms and tentacles

Question 17

larval type shared with annelids

Answer 17

trochophore larva

Question 18

structure used for gas exchange

Answer 18

gills

Question 19

sensory structures found on snails

Answer 19

light sensitive eyes and antennae

Question 20

highly developed system in active predator, relative to that seen in a clam or a snail

Answer 20

nervous system

Question 21

class Mollusca

Answer 21

includes

• class bivalvia (clams and oysters)
• class Gastropoda (snails and slugs)
• class Cephalopoda (octopus and squid)

Question 22

all members of Mollusca must have

Answer 22

1. mantle
   - tissues that secretes shell material, calcium carbonate H20 out of siphon
2. Muscular Foot
   - locomotary or clinging foot
3. Soft-bodied

Question 23

Class Bivalvia (2 valves) (clams, oysters, mussels)

Answer 23

• sessile
• filter feeders
• range of habitats due to siphon and shell
• open circulatory system with 2 chambered heart

Question 24

Class bivalvia siphon and shells

Answer 24

• siphon (double tube) take in food and oxygen get rid of waste and CO2
• shell 2 part shell, closes tightly and retain water necessary for survival

Question 25

class bivalvia circulatory system

Answer 25

Open circulatory system with 2 chambered heart § Blood delivered to sinuses (chambers) in tissues § Soaks tissues delivering oxygen and removing carbon dioxide § Blood can be withheld in a sinus, causing tissue to swell up

Question 26

clams foot

Answer 26

can be extended and used as an anchor to aid in movement

Question 27

bivalvia are sessile animals

Answer 27

- they broadcast gametes into water for distribution and possible fertilization - trocophorelarva (similar to Annelids) develops from zygote - gills exchange gases with water drawn in through siphon

Question 28

bivalvia digestive tract

Answer 28

- simple,short - undigested material released through anus back into water via siphon - nephridia, removes metabolic waste-localized to one region

Question 29

bivalvia nervous system

Answer 29

- not highly specialized due to sessile slow moving lifestyle - brain area + nerve cords operate foot and siphon

Question 30

Class Gastropoda (stomach foot) (snails, shells) (Slug, no shell)

Answer 30

- snail mantle located around open edge of shell - Foot: compromises soft tissue mass on ventral surface - muscular undulations allow slow movement - slime acts as a lubricant when crawling - radula (tongue-like structure with bony plates) for feeding

Question 31

Class Gastrapoda are what

Answer 31

- hermaphroditic (annelids, exchange sperm between reproductive organs on ventral surface) - fertilization occurs later; eggs deposited in damp places

Question 32

class Gastropoda nervous system

Answer 32

- light sensitive "eyes" on retractable antennae - cephalized with distinct head region - 2 chambered hearts - open circulatory

Question 33

Class Cephalopoda (head foot) (squid, cuttlefish, octopus, nautilus.)

Answer 33

- Most highly evolved/specialized members of phylum - hunters noted for subdivided foot, large heads, well-developed nervous systems and move quickly - closed circulatory system - zoom zoom fast - Efficient swimmers, move by jet propulsion water is forced out of siphon

Question 34

class cephalopoda eye

Answer 34

-similar ability to learn and behave in a complex manner

Question 35

LOOK AT MOLLUSCA SIAGRAMS

Answer 35

gang