Question

1) The term the “Good, the Bad and the Ugly” has often been applied to the phylum Nematoda.   Give an example of a genus within this phylum that would match each of the above terms. Briefly, explain why you selected this Genus.  

Answer 1

Good Nematode-Heterorhabditis bacteriophora- this nematode is also known as gardeners friends and help in killing insects, moths and pests by releasing Photorabdus bacteria inside the gut of pest that kill the pest. So this nematode is one of the example of good bacteria.

Bad nematode- Many nematode caauses disease to human and comes under bad nematode. example is Wuchereria bancrofti that cause Elephantisis in human.

Ugly nematode- We cannot see a nematode and say its ugly. But sometime nematode make the host ugly. Ditylenchus dipsaci is a nematode that infect alfalfa and make the stem swell and leave white patch to the crop.