(1) In life cycle of Ascaris at what stage do they enter the human body?

Question

Observe the given diagram and answer the following questions:

(1) In life cycle of Ascaris at what stage do they enter the human body?

(2) How do they enter the human body and through which organ do they enter?

(3) What are the vital organs affected by the Ascaris during its development within the body of host human ?

(4) In which organ do they copulate and produce fertilized eggs?

Answer 1

(1) When there is development of infective larva inside the egg of Ascaris, it enters the human body.

(2) Ascaris eggs are deposited in the faeces. They mix in the soil, if faeces is exposed in open. From there, it can enter into nearby water body or it may contaminate vegetables or other food stuffs. Such unhygienic food or unclean hands pass these eggs in the body of human through the mouth.

(3) Ascaris can affect trachea, lungs, heart, brain and eyes too.

(4) Adult male and female copulate in the intestine of the host human.