Read the following
i) First stage larva undergoes first moulting inside the egg
ii) First two moultings occur in the thorasic muscles of female Culex mosc
iii) Second and third moultings occur inside the alveoli of lungs in human
iv) Third and fourth moultings occur inside the lymphatic system in human
v) The life history shows extra intestinal migration
In the above which statements are true to common round worm
(1) i, i & v only
(2) i, ii & i only
(3) ii, ii & only
(4) ii, iv & v only
Answers
Answer:
BIOLOGY
HARD
The places of first, second and third moulting of Ascaris larva are
A
Soil, alveoli and lung
B
Liver, soil and stomach
C
Soil, lung and liver
D
Soil, intestine and lung
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ANSWER
Fertilization eggs of Ascaris are passed out from the host's body with it's faeces into the soil where first larval moulting takes place. This larvae does not have the power of infection. It becomes moulted into second stage larvae which infects the host through consumption of contaminated food and water. This second stage larvae hatches out into a juvenile, through the blood circulation, reaches to the heart and then to lungs. From lungs it migrates to alveoli where third and fourth stage moulting takes place.
Thus, the correct answer is option D.
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