Common Disease-Causing Organisms Like Ascaris, Entamoeba, Plasmodium, Ringworm Through Permanent Slides or Specimens. Comment on Symptoms of Diseases That They Cause


To observe the disease-causing organisms like Ascaris, Entamoeba, Plasmodium and Ringworm through permanent slides.

Materials Required

Preserved slides or specimens of disease-causing organisms like Ascaris, Entamoeba, Plasmodium and Ringworm.


Observe the specimens or slides and identify the organism on the basis of its features.



Phylum: Aschelminthes

Class: Nematoda

Type: Ascaris lumbricoides

Ascaris exhibits the following characteristic features:

  1. It has a long, cylindrical and unsegmented body.
  2. The male and female organisms are separate.
  3. It bears a mouth at the anterior end surrounded by three lips.
  4. There is an excretory pore on the ventral surface slightly behind the anterior end.
  5. A pair of penial spicules are present in the male worms close to the cloacal opening.
  6. The female genitals are present at about one-third distance from the anterior end.

Ascariasis is the disease caused by Ascaris lumbricoides or roundworm.


  • Abdominal cramping
  • Abdominal swelling
  • Nausea
  • Vomiting
  • Fever


Phylum: Protozoa

Class: Rhizopoda

Type: Entamoeba hystolytica

Following are the characteristic features of Entamoeba:

  1. It is a unicellular organism with an irregular shape.
  2. It consists of a few food vacuoles. The contractile vacuole is absent.
  3. Cysts with four nuclei are present.
  4. It consists of a nucleus located eccentrically in the cell.

Entamoeba histolytica is an organism found in the intestines of humans that is responsible for causing amoebic dysentery.


  • Abdominal pain
  • Watery diarrhoea with mucus, blood and pus
  • Fatigue
  • Fever
  • Nausea
  • Vomiting


Phylum: Protozoa

Class: Sporozoa

Type: Plasmodium vivax

Plasmodium can be identified by the following characteristic features:

  1. It is a unicellular endoparasite found within the red blood cells of the diseased person.
  2. The parasite is mostly diagnosed at the “signet ring” stage where the parasite appears as a round body.
  3. There is a big vacuole present inside the cell. The cytoplasm is accumulated at one place and contains the nucleus.

Plasmodium vivax is a protozoan parasite that causes malaria in humans. The infected female anopheles bites a healthy person and transmits the sporozoite into the peripheral blood vessels of humans, thereby, causing malaria.


  • High fever
  • Shaking chills from moderate to severe.
  • Headache
  • Vomiting
  • Nausea


Kingdom: Fungi

Class: Deuteromycetes

Type: Trichophyton rubrum

Trichophyton or ringworm fungus has the following characteristic features:

  1. This fungus feeds on the keratin of the skin of human beings.
  2. The hyphae are waxy and can be smooth or cotton-like.
  3. Hyphae that are not stained are yellowish-brown, reddish-brown or white in colour.

Ringworm is a communicable fungal infection of the skin.


  • Scaly, itchy skin
  • Red and raised patches
  • They are redder at the periphery than at the centre and forms a ring-like appearance.

Also Read: Microbes and Disease

Infectious Diseases

Learn more in detail about the different types of disease, the causing agents, other related topics and experiments at BYJU’S Biology.



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