Helminths

Question 1

flatworms

Answer 1

have flattened bodies that are slender and broadly leaflike (Trematodes - flukes) or long and ribbonlike (Cestodes - tapeworms); roundworms (Nematodes) have round bodies

Question 2

multicellular eukaryotes which

Answer 2

lack cell walls

Question 3

size

Answer 3

from microscopic (flukes) to 10 meters long (some tapeworms)

Question 4

holdfasts

Answer 4

(hooks, suckers, etc.) attach parasitic forms to host tissues

Question 5

Helminths reproduction:

Answer 5

sexual - mating leads to fertilized eggs (ova) which are released into the environment, to mature into offspring; Cestodes and Trematodes are generally hermaphroditic (one worm possesses both male and female reproductive organs)

Question 6

Physiology:

Answer 6

food intake - roundworms ingest food; flatworms absorb nutrients

Question 7

importance and habitat

Answer 7

decomposers are found everywhere (especially roundworms); parasitic forms cause disease in plants or animals