Class XII · Biology practice

Human Health and Disease MCQs

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446 questions in this collection · Page 20 of 45

Question 191 of 446

📘 CLASS XII

Human Health And Disease

Pneumonia, caused by bacteria like *Streptococcus pneumoniae*, infects the ____ of the lungs.

Pneumonia bacteria infect the alveoli (air filled sacs) of the lungs.

Question 192 of 446

📘 CLASS XII

Human Health And Disease

In severe cases of pneumonia, the lips and finger nails may turn ____ in colour.

In severe cases of pneumonia, the lips and finger nails may turn gray to bluish in colour.

Question 193 of 446

📘 CLASS XII

Human Health And Disease

____ viruses cause one of the most infectious human ailments—the common cold.

Rhino viruses cause the common cold.

Question 194 of 446

📘 CLASS XII

Human Health And Disease

Common cold viruses infect the nose and respiratory passage but explicitly do NOT infect the ____.

Rhino viruses infect the nose and respiratory passage but not the lungs.

Question 195 of 446

📘 CLASS XII

Human Health And Disease

____, a tiny protozoan, is responsible for causing malaria.

Plasmodium, a tiny protozoan, is responsible for malaria.

Question 196 of 446

📘 CLASS XII

Human Health And Disease

Malignant malaria, the most serious and potentially fatal type, is caused by *Plasmodium* ____.

Malignant malaria caused by *Plasmodium falciparum* is the most serious one and can even be fatal.

Question 197 of 446

📘 CLASS XII

Human Health And Disease

Plasmodium enters the human body as ____, which is the infectious form.

Plasmodium enters the human body as sporozoites (infectious form) through the bite of infected female Anopheles mosquito.

Question 198 of 446

📘 CLASS XII

Human Health And Disease

The toxic substance released upon the rupture of 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.

Question 199 of 446

📘 CLASS XII

Human Health And Disease

The malarial parasite requires ____ hosts – human and mosquitoes – to complete its life cycle.

The malarial parasite requires two hosts—human and mosquitoes—to complete its life cycle.

Question 200 of 446

📘 CLASS XII

Human Health And Disease

____ is a protozoan parasite in the large intestine causing amoebiasis (amoebic dysentery).

Entamoeba histolytica causes amoebiasis (amoebic dysentery).

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