animal kingdom #2

Question 1

nematoda

Answer 1

roundworms

• are unsegmented/round and have 3 germ layers
• hollow body cavity is present between endoderm and mesoderm called pseudocoelom which is false because it is only partially lined by the mesoderm
• two hole digestive track mouth and anus
• parasitic nematodes (hookworms)
• c.elegons fist life forms biologists sequenced all DNA

Question 2

why are psuedocoeloms and coeloms so important

Answer 2

allows the space for organ growth and development and functioning

Question 3

annelids

Answer 3

• segmented worms with a true coelom lined on both sides with mesoderm.
• individual segments have external walls that separate them and each segment allows organ growth
• closed circulatory system( they have blood vessels)
• leeches are a type of annelid and they are parasitic

Question 4

arthropod characteristics (9)

Answer 4

• jointed legs
• segmented bodies head thorax abdomen
• exoskeleton
• seperate sexes DIESCOUS
• coelom
• open circulatory system
• excrete bu greenglands(water) or malpighian glands (dry terrestrial)
• cephalization-dorsal and ventral areas
• bilateral symmetry

Question 5

classes of arthropods

Answer 5

crustacea-2 pairs of antenna

• five pairs of legs
• oxygen- gills- water
• cephalothorax and abdomen

insecta- 1 pair of antenna

• 3 pairs of legs
• head thorax and abdomen

arachnid- no antenna

• 4 pairs of legs
• cephalothorax and abdomen

chilopoda (centipede) - 1 pair of legs on each body segment
-1 pair of antenna

diplopoda (millipede)- no antenna
- 2 pairs of legs for each body segment

Question 6

arthropoda info ( sorry in advance)

Answer 6

most successful phylum. includes terrestrial animals as well as aquatic animals. bodies are segmented into head, thorax, and abdomen. exoskeleton is made of the protein chitin. they have jointed appendages. they have complete organ systems for respiratory, response, feeding, circulation,excretion, reproduction, movement. evolution=fewer body segments and highly specialized appendages.

Question 7

parts of grasshoper

Answer 7

spiracle- hole in the side of the grasshopper where gas exchange occurs (breathing) attached to tracheal tubes
tracheal tube- network of branched tubes that extend throughout the body and used for gas exchange ( breathing)
malpighian tubule- disposal of nitrogenous wastes. extract from blood and add it to the feces or digestive wastes.

Question 8

open circulatory system

Answer 8

heart pumps blood into arteries which end and the blood trickles through the body and system and is then collected in sinuses and taken back to the heart to circulate again.

Question 9

incomplete metamorphosis vs complete meatmorphosis

Answer 9

• born from egg and looks like adult just grows in size

- young form and older form look different

Question 10

external features of crayfish

Answer 10

carapace- sale like structure on anterior of exoskeleton on cephalothorax
cephalothorax- head and thorax fused together
pinching class-front longest claws
walking legs- attached to cephalothorax and used for movement
uropod- outter edges of tail
telson- middle part of tail(has anus on it )
antenna- 2 pairs at front near eyes on cephalothorax
eye- two black compound eyes under rostrum
male- long straw like first swimmerts that are bigger and have a genital vas deferens pore on fifth leg
female- all swimmers are the same size and they do not have a genital pore on the fifth walking leg
anus-on telson
rostrum- top part that protects the eyes ( triangle)

Question 11

internal features of crayfish

Answer 11

lenses- inside compound eye
gills- attached to walking leg just inside exoskeleton
cerebral ganglion- concentration of nerves behind eyes
nerve- runs lengthwise to body and attached to cerebral ganglion
green gland- on either side of cerebral ganglion
heart- near dorsal surface of crayfish it is squarish and diamondy shaped and has holes and does have some arteries attached
digestive gland- white gross stuff on either side of the stomach and at the bottom
esophagus- near mouth???