phylum nematoda

Question 1

cuticle

Answer 1

outermost layer, stiff, resistant to outside conditions, made of collagen, noncelullar, secreted by the layer underneath, shed and replaced throughout life (called ecdysis)

Question 2

ecdysis

Answer 2

the shedding of an exterior cuticle or exoskeleton

Question 3

hypodermis

Answer 3

the layer underneath the cuticle, syncytial, produces the cuticle through secretions

Question 4

nematode nervous system

Answer 4

consists of dorsal and ventral nerve cords and two types of sensory structures that are openings in the cuticle that allow them to smell/sense the env called amphids and phasmids

Question 5

amphids & phasmids

Answer 5

openings in the cuticle that allow nematodes to sense their environment, amphid is at anterior, phasmid at posterior

Question 6

nematode excretory system

Answer 6

lack metanephridia
lateral cords have excretory canals with dermal pores

Question 7

is nematode digestive system complete?

Answer 7

yes, mouth + anus

Question 8

nematode pharynx

Answer 8

lines with cuticle, often has specialized hooks /cutting plates / teeth

Question 9

most nematodes are _____ feeders

Answer 9

fluid: eat sap, blood
those who aren’t eat bacteria

Question 10

nematode development

Answer 10

direct development since there is not larvae, but they have 4 juvenile stages which molt to go to next one.

Question 11

what is interesting about nematode cells?

Answer 11

they have consistent number throughout whole life, all adult members of a species have the same number cells which can be mapped