Assertion: Filarial worm is transmitted to humans by Culex mosquito.
Reason: Culex prefers to breed in fresh water.

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If both assertion and reason are false.

Solution

If assertion is true but reason is false.

Wuchereria (W.bancrofti and W.malayi), the filarial worms cause a slowly developing chronic inflammation of the organs in which they live for many years, usually the lymphatic vessels of the lower limbs, and the disease is called filariasis. The pathogen spreads from one human being to another through mosquitoes like Culex and to a less extent by Anopheles and Aedes. The parasite resides in lymph vessels, connective tissues and mesentery. It is manifestated by lymphoedema accompanied by thickening of subcutaneous tissues and skin so that there is permanent swelling mostly of feet, legs, thighs, scrotal sacs, breast etc. In Culex and other mosquitoes females are blood sucking while males suck juices of flowers and fruits. Female Culex carries filarial worm from one person to another. It prefers to breed in dirty water near human habitation.

Some More Questions From Human Health and Disease Chapter

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Human Health And Disease

Some More Questions From Human Health and Disease Chapter

What is the significance of ‘Typhoid Mary’ ?

Name the most infectious human common ailment and write its causative agent.

Out of four species of malaria which is most serious ?

Name the vector of malaria.

Write the causative agent of (i) amoebiasis and (ii) ascariasis.

Name the disease caused by Wuchereria bancrofti.

List three fungal genera which cause ringworm.

List two symptoms of ring worm.

Name the two wide spread diseases caused by Aedes mosquitoes.

Name the primary lymphoid organs.

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