Invertebrates

Question 1

What are the phylum?

Answer 1

• porifora
• cnideria
• platyhelminthes
• nematoda
• annelida
• mollusca
• arthropoda
• echinodermata

Question 2

Porifora

Answer 2

• sponges
• reproduce sexually via pump/filter and asexual (budding)
• skeleton made of spicules (glass)
• body has collagen
• no nervous system
• choanocytes pump water to absorb nutrients and feed
• internal and external, hermaphrodites (polyps) and 2 sexes (medusa)

Question 3

Cnidaria

Answer 3

-anemone, jellyfish, polyps (coral)
-2 sexes
-asexual and sexual rep.
-external fertilization
-medusa (sexual life cycle),
polyp (asexual life cycle)
-first to have stomach and mouth
-have nemadocysts (stinging sacs)
-nerves

Question 4

Platyhelminthes

Answer 4

• flatworms, planarians
• stereo senses
• sexual reproduction
• hermaphrodites
• first to have internal fertilization
• sperm exchange is one sided
• central nervous system
• eats with pharynx
• first to have head. brains, eyes
• bilateral

Question 5

Nematoda

Answer 5

• roundworm
• sexual reproduction
• internal fertilization
• 2 sexes
• predominantly parasitic
• nerves
• bilateral
• no circulatory system (uses diffusion)
• first to have anus
• 9 tissue layers

Question 6

Annelida

Answer 6

• leech, earthworm
• has head and muscles
• segmented
• internal fertilization
• hermaphrodites
• sexual reproduction
• sperm exchange is mutual
• has gills, nervous/circulatory systems
• 5 hearts, has blood
• secretes glue like substance
• leeches inject anesthetic

Question 7

Mollusca

Answer 7

• clams, oysters, scallops, octopus, squid, snails, cockle
• muscular/circulatory system
• bilateral
• 2 sexes (some are hermaphrodites though)
• internal fertilization
• sexual reproduction
• 3 hearts
• radula (tongue/teeth organ)
• mantle (shell made of skin)
• visceral mass (organs)
• moves via jet propulsion
• buoyant
• intelligent
• foot used to move

Question 8

Arthropoda

Answer 8

• crab, lobster, shrimp, krill, scorpions, insects
• jointed appendages
• sexual rep.
• internal fert.
• 2 sexes
• first terrestrial phyla
• exoskeleton (molts to grow body)
• complex eyes
• metamorphosis
• book lungs
• detritivores
• reinforced trachea

Question 9

Echinodermata

Answer 9

• sea star, urchin, sea cucumber
• headless, no eyes
• sensory tubes at end of arms
• mouth underneath
• bulbs inside inflate with water to power tube feet
• hydraulic tube feet
• 5 part body symmetry
• lattice like skeleton from bony platelets
• nervous ring instead of brain
• larvae more complex than adults
• 2 sexes, sexual and asexual, external fert.