Arrange the following steps in sequence for Ascaris infection in humans :
(A) Development of round worms in human host
(B) Excretion of parasite eggs along with the feces of infected person resulting in soil and water contamination
(C) Infection of healthy person via contaminated water, vegetables, fruits etc.
(D) Muscular pain, fever, blockage of intestinal passage
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (C), (A), (D), (B)
The cycle can be followed from a person newly infected: a healthy person takes in eggs through contaminated water, vegetables or fruits (C); round worms develop in the intestine (A); symptoms such as muscular pain, fever and blockage of the intestine follow (D); eggs leave with the faeces and contaminate soil and water (B).
NCERT Extract:
Common Diseases in Humans – “… Ascaris, an intestinal parasite causes ascariasis. Symptoms of these disease include internal bleeding, muscular pain, fever, anemia and blockage of the intestinal passage. The eggs of the parasite are excreted along with the faeces of infected persons which contaminate soil, water, plants, etc. A healthy person acquires this infection through contaminated water, vegetables, fruits, etc.”