Question

Identify the nematodes which have various shapes of aphids but without phasmids.
A)Trichinella and Greeffiella
B)Enterobius and Ancylostoma
C)Meath and Ancylostoma
D)Wunchereria and Ascaris

Answer 1

Hint: The species that belong to the phylum Nematoda are often referred to as "roundworms." To date, 28000 species of Nematoda have been described. They are vermiform creatures who are unsegmented. There are dorsal and ventral nerve cords in the epidermis.

Complete answer:
 In the form of papillae, Phylum Nematoda has poorly formed sensory organs that are well established as aphids (in the mouth) and plasmids (in anus). Innervated invagination of cuticles in nematodes is aphids. They are normally situated at the base of the lips in the anterior (head) area of the animal. The main olfactory sensory organ of nematodes is amphids. Twelve sensory neurons with ciliated dendrites are composed of each amphid.

In the lateral tail regions of some nematodes, a plasmid is the unicellular sensilla. They are equal, but they are smaller than aphids. They also combined sensory organs with post anal chemoreceptor. On the basis of sensory organs, nematodes are split into two classes:

Aphasmidia (adenophora), of which there are no phasmids and various shapes of aphids, e.g., Trichinella and Greeffiella.
Phasmida (Secernentea), where there are phasmids and pore-like amphids, e.g., Ascaris lumbricoides, Enterobius vermicularis.

Hence, the correct answer is option (A)

Note: 1)Bacteria, fungi, and other nematodes prey on the nematodes found in the soil and play an important part in nutrient recycling.
2)The mosquitoes are often attacked and the pests are managed.
3)They do serious damage to trees, however. They feed on the roots of plants and decrease the plant's nutrient uptake and stress resistance.
4)Many Nematodes contain a lot of dirt. In humans, they induce disorders such as Ascariasis, Trichuriasis, Hookworm, Enterobiasis, Filariasis, and Angiostrongyliasis.