The toxic substance released upon the rupture of Red Blood Cells (RBCs) in malaria, causing chill and high fever, is:
The rupture of RBCs releases a toxic substance, haemozoin, which is responsible for the chill and high fever recurring every three to four days.
Question 22 of 446
📘 CLASS XII
How many hosts are required for the malarial parasite to complete its life cycle?
The malarial parasite requires two hosts—human and mosquitoes—to complete its life cycle.
Question 23 of 446
📘 CLASS XII
Amoebiasis (amoebic dysentery) is caused by the protozoan parasite:
Entamoeba histolytica is a protozoan parasite in the large intestine of human which causes amoebiasis.
Question 24 of 446
📘 CLASS XII
Houseflies play a role in the transmission of amoebiasis by acting as:
Houseflies act as mechanical carriers and serve to transmit the parasite from faeces of infected person to food.
Question 25 of 446
📘 CLASS XII
Ascariasis is caused by the common round worm *Ascaris*. A major symptom of this intestinal parasite is:
Symptoms of ascariasis include internal bleeding, muscular pain, fever, anemia and blockage of the intestinal passage.
Question 26 of 446
📘 CLASS XII
Elephantiasis (filariasis) is caused by the filarial worm *Wuchereria* which lives in the body for many years, usually affecting the:
Wuchereria causes a slowly developing chronic inflammation of the organs, usually the lymphatic vessels of the lower limbs.
Question 27 of 446
📘 CLASS XII
Which of the following genera of fungi is responsible for causing ringworms?
Many fungi belonging to the genera Microsporum, Trichophyton and Epidermophyton are responsible for ringworms.
Question 28 of 446
📘 CLASS XII
Ringworms are generally acquired from soil or by using contaminated items such as:
Ringworms are acquired from soil or by using towels, clothes or even the comb of infected individuals.
Question 29 of 446
📘 CLASS XII
For infectious agents transmitted through food and water (like typhoid and amoebiasis), which public hygiene measure is essential?
Public hygiene includes proper disposal of waste and excreta; cleaning and disinfection of water reservoirs, particularly essential for food- and water-borne diseases.
Question 30 of 446
📘 CLASS XII
Which fish is commonly introduced in ponds to feed on mosquito larvae to control vector-borne diseases like malaria and filariasis?
Introducing fishes like Gambusia in ponds that feed on mosquito larvae is a vector control measure.
