Which of the following organisms cannot exist freely on its own?

A. Chlamydomonas
B. Amoeba
C. Paramecium
D. Plasmodium

Correct Answer: Option D

D. Plasmodium

Explanation

The plasmodium is a single-celled parasite that multiplies in red blood cells of humans as well as in the mosquito intestine. Hence, it doesn’t live freely.