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Human Health and Disease MCQs
Class XII Biology
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NCERT Based
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NEET Practice
📘 Concept Based
📝 Exam Level
🤖 AI Explanations
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446 questions in this chapter
Question 191 of 446
📘 CLASS XII
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
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
____ viruses cause one of the most infectious human ailments—the common cold.
Rhino viruses cause the common cold.
Question 194 of 446
📘 CLASS XII
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
____, a tiny protozoan, is responsible for causing malaria.
Plasmodium, a tiny protozoan, is responsible for malaria.
Question 196 of 446
📘 CLASS XII
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
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
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
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
____ is a protozoan parasite in the large intestine causing amoebiasis (amoebic dysentery).
Entamoeba histolytica causes amoebiasis (amoebic dysentery).
