Phylum Nematoda

Question 1

Locomotion in nematodes

Answer 1

Use pseudocoelem as a hydrostatic skeleton, alternative contractions of dorsal and ventral muscle blocks help nematodes move.

Question 2

Difference between males and females in nematoda

Answer 2

Adult males smaller than females, females have 3 openings (mouth, genital pore and anus), male have 2 openings (mouth and anus)

Question 3

Feeding groups in nematoda

Answer 3

Saprophytic nematodes: decomposers
Predaceous nematodes : (animals and plants)
Parasitic nematode: parasites

Question 4

Characteristics of saprophytic nematode

Answer 4

Extremely abundant, break down organic soil, improve soil structure, release nutrients for plant use and increase plant productivity

Question 5

Characteristics of predator nematodes

Answer 5

Eat larger nematodes, attach to prey and scraping away internal organs, use similar feeding techniques on other animals.

Question 6

Characteristics of Nematoda

Answer 6

Bilateral symmetry, triploblastic , pseudocoelomate, non-segmented, complete digestive system, no circulatory and respiratory system, most dioecious but some hermaphrodite, have cuticle, free-living forms and predators

Question 7

Characteristics of plant herbivores

Answer 7

Stylet penetrates cell and suck a out content (kills cells)

Question 8

Characteristics of parasitic nematodes (heart worm)

Answer 8

Serious and potentially fatal in dogs, found in heart & large adjacent blood vessels, restricts blood flow and it is transmitted by mosquitoes

Question 9

Characteristics of nematoda parasite (wuchereria bancrofti)

Answer 9

Causes elephantiasis in humans( 2 hosts-human and mosquito), lymphatic disorder created inflammation of lymphatic vessels and causes extreme enlargement.

Question 10

Characteristics of parasitic nematode (ascaris sp.)

Answer 10

Matures in the intestine of the host and it matures and mates ( females produce 240,000 eggs)