Invertebrates

Question 1

What phylum do Cnidarians belong to?

Answer 1

Eumetazoans

Question 2

Scientific name for sponges

Answer 2

Porifera

Question 3

How do sponges feed?

Answer 3

-Suspension feeders:
Capture food particles suspended in water
-Water is drawn in through the Spongocoel and out through the Ocsculum

Question 4

What do sponges lack?

Answer 4

True tissues and organs

Question 5

Choanocytes

Answer 5

-Flagellated cell that generate a water current through sponge and ingest suspended food

Question 6

Amoebocytes

Answer 6

Small symbiotic organisms found in the mesophyll that aid in digestion

Question 7

Cnidaria

Answer 7

Sessile- corals, anemones
Motile- jellies, hydras
Contain a gastrovascular cavity

Question 8

Polyp

Answer 8

Adheres to the substrate

Found on cnidaria

Question 9

Medusa

Answer 9

Cnidaria that have bell-shaped body with mouth on their underside and can move

Question 10

Cnidocytes

Answer 10

Unique cells that function in defense and prey capture

Question 11

Nematocysts

Answer 11

Specialized organelles within cnidocytes that eject a stinging thread

Question 12

Flatworms (Lophotrochozoa)

Answer 12

• Gastrovascular cavity with one opening
• Gas exchange on surface
• Dorsoventrally flattened shape maximizes surface area for gas exchange

Question 13

Molluscs

Answer 13

• Snails, oysters, octopuses
• Many marine, some freshwater, some terrestrial
• Soft bodies, hard shells
• Muscular foot
• Visceral mass
• Calcium carbonate shell

Question 14

Bivalves

Answer 14

• Aquatic, includes clams and oysters
• Shell divided into two halves held together by adductor muscles
• Limited motility in some

Question 15

Arthropods

Answer 15

• Nearly all habitats
• Segmented body
• Hard exoskeleton
• Jointed appendages
• open circulatory system where hemolymph is pumped around tissues

Question 16

Insects

Answer 16

• evolution of flight was important for survival

- many undergo metamorphosis

Question 17

Echinoderms

Answer 17

• starfish
• slow moving/sessile
• thin epidermis covers exoskeleton of hard calcareous plates
• radial symmetry
• water vascular system

Question 18

Water vascular system

Answer 18

A network of hydraulic canals branching into tube feet

-functions in locomotion, feeding, respiration and waste removal

Question 19

Sieve Plate

Answer 19

Intake valve that allows water to enter the vascular system