Phyla Nematoda

Question 1

mouth

Answer 1

opening for the intake of food

Question 2

elephantiasis

Answer 2

parasitic disease caused by filarial worms

Question 3

phylum Nematoda

Answer 3

roundworms, most numerous of all animals, slender and unsegmented with tapering ends. they range in size from microscopic to a metre in length. free living soil, salt flats, aquatic sediments and water. geographic distribution from polar regions to tropics. some are parasitic.

Question 4

pseudocoelom

Answer 4

false coelom only partially lined with mesoderm

Question 5

opening for the excretion of the wastes

Answer 5

anus

Question 6

phylum Nematoda pt2

Answer 6

have three germ layers, have body cavity between endoderm and mesoderm tissues. pseudocoelom - body cavity only partially lined with mesodermal tissue “false coelom”.

Question 7

phylum Nematoda digestion

Answer 7

two digestive tract openings - tube within a tube. inner tube- digestive tract, outer tube- body wall. food only goes one way, has a mouth and anus.

Question 8

feeding

Answer 8

predators, grasping mouthparts and spines to catch and eat prey. environments include soil and aquatic, algae, fungi and detritus.

Question 9

respiration, exception and circulation

Answer 9

changing gases and metabolic wastes through body walls via diffusion, no internal transport system.

Question 10

response

Answer 10

simple nervous systems consisting of several ganglia, nerves transit sensory information and control movement.

Question 11

movement

Answer 11

muscles extend length of body fluid in pseudocoelom function as hydrostatic skeleton.

Question 12

reproduction

Answer 12

sexual reproduction, most have separate sexes, internal fertilization, parasitic roundworms have two or three different hosts or several organs within a single host.

Question 13

roundworms and human diseases

Answer 13

trichinosis, elephantiasis (filarial worms) and malnutrition (ascaris worms).

Question 14

trichinosis

Answer 14

found in intestines of host and female burrowed into intestinal walls and release larvae. larvae travel through blood stream and then burrow into organs and tissues. larvae forms a cyst and becomes inactive in host muscle tissue. life cycle is complete when host muscle is eaten. commonly found in pigs and rats.

Question 15

elephantiasis

Answer 15

filarial worms found in tropical regions of Asia, lives in lymph vessels of birds and mammals, transited through insect bites.

Question 16

malnutrition

Answer 16

ascaris worms causes malnutrition in humans and other vertebrates. absorbs digested food in small intestines of host.

Question 17

hookworms

Answer 17

eggs hatch soil, enter host through unprotected feet ad into bloodstream traveling to lungs and then intestines to absorb digested food.

Question 18

tube within a tube

Answer 18

having two digestion tract openings

Question 19

diffusion

Answer 19

method of transporting materials through thin bodied animals