CBSE Questions for Class 12 Medical Biology Human Health And Disease Quiz 4 - MCQExams.com

• Ringworm is a fungal infection of the skin that affects the skin of scalp, feet, groin, beard and also nails. 
• It is a contagious disease that spreads from person to person or contact with fomites. 
• The disease is also called  Athlete's foot when the pathogen infects the foot. 
• It is also called Barber's itch as it spreads through barbers commonly. 
• It is called Dhobie's itch as washermen come in contact with infected clothes and get the disease. 

An intermediary host is a host that harbours a parasite that primarily grows, but not to the point of reaching (sexual) maturity.

• Ascaris doesn't have an intermediary host and completes its life cycle in a single host i.e. humans.
• The intermediate host in the case of tapeworm may be fish, pork, beef etc. 
• The intermediate host in the case of liver fluke is a mud snail.
• The intermediate host in the case of Plasmodium is the female Anopheles mosquito.

So, the correct answer is option B.

• Filariasis is a parasitic disease, caused by an infection with the filarial worms,
• These are spread by culex mosquitoes. 
• Filariasis is diagnosed in microfilaraemia cases primarily through direct observation of microfilariae in the peripheral blood. 
• Filariasis is characterized by the swelling of limbs and is called as elephantiasis.

Solution

Correct answer is option B.
Explanation for correct option:

• Filariasis is a parasitic infection caused by an infection with roundworms larva called Microfilaria.
  
• They release the toxins in lymph and block the lymph vessels which causes the swelling of limbs called elephantiasis.
• These circulating microfilaria can be taken up with a blood meal by the arthropod vector, in the vector they develop into infective larvae that can be transmitted to the new host.

• Ascariasis is caused by the parasitic roundworm Ascaris lumbricoides and spread by the contamination of water and food by faeces and not by insects.
  
• Malaria is caused due to the protozoan Plasmodium and spread through infected female anopheles mosquito. 
• Leishmaniasis is caused due to protozoan parasite due to the biting of sandflies. 
• Filariasis is a roundworm infection of Wuchereria bancrofti that spreads through the biting of black flies and mosquitoes. 
• Thus, the correct answer is option D.

• Tinea is the name of a group of diseases caused by a fungus.
• Types of tinea include ringworm, athlete's foot and jock itch. 
• You can get them by touching an infected person, from damp surfaces such as shower floors, or even from a pet. 
• Hence, the Causative agent of Athlete's foot disease is Tinea.
• So, the correct answer is 'Tinea'.