Question

1. which of the following statements is true about protozoa?

a. protozoa are parasites.
b. protozoa are very similar to bacteria.
c. certain protozoa cause dysentery and malaria.
d. both a and c are true.

Explanation:

• Option A: Not all protozoa are parasites; some are free - living. So A is incorrect.
• Option B: Protozoa are eukaryotes, while bacteria are prokaryotes. They are not very similar. So B is incorrect.
• Option C: Organisms like Entamoeba (causes dysentery) and Plasmodium (causes malaria) are protozoa. So this statement is true.
• Option D: Since A is incorrect, D is also incorrect.

Answer:

C. Certain protozoa cause dysentery and malaria.