Question

Which one of the following diseases is caused by protozoans?

• A. AIDS
• B. Cholera
• C. Influenza
• D. Malaria

Answer 1

The correct option is D

Malaria

The correct option is D.

Explanation of correct option:

1. These are single-celled eukaryotic organisms.
2. They have complex inner structures and complex metabolism.
3. They can cause several diseases.
   1. Malaria is spread by the bite of the female anopheles mosquito.
   2. Its common symptoms are fever, chills, headache, etc.
   3. It is caused by the Plasmodium parasite.

Explanation of incorrect options:

Option A:

1. AIDS is caused by HIV.
2. The person's immune system weakens in this condition.

Option B:

1. Cholera is caused by the bacterium Vibrio cholerae.
2. The disease is characterized by vomiting and stomach ache.

Option C:

1. The causative organism of influenza is the influenza virus.
2. The virus attacks the respiratory system.

Final answer: Malaria is caused by protozoans.