Question

The disease caused by a protozoan and spread by an insect is _________.

• A. Dengue
• B. Malaria
• C. Polio
• D. Measles

Answer 1

The correct option is B

Malaria

The correct option is B

Explanation for the correct option:

1. Malaria is a disease that is caused by protozoa and is spread by an insect.
2. The causal organism of malaria is Plasmodium and it is spread by the female anopheles mosquito.
3. Malarial parasite is digenetic i.e., it needs two hosts to complete its life cycle.
4. The malarial parasite enters the host's body by the bite of a female anopheles mosquito.

Explanation for the incorrect Options:

Option A:

1. Dengue is caused by a virus and not by protozoa.
2. Dengue is spread by Aedes aegypti mosquito.

Option C:

1. Polio is caused by poliovirus and not by protozoa.
2. Poliovirus is transmitted by the fecal-oral route.

Option D:

1. Measles is caused by a virus and not by protozoa.
2. Measles is airborne and is transmitted through the air when an infected person coughs or sneezes.

Final answer: The disease caused by a protozoan and spread by an insect is malaria.