11.Name two diseases caused by protozoans. What are their causal organisms ?

Protozoan Disease :

1. Protozoans are unicellular organisms and can sometimes cause illness.
2. Common protozoal diseases include malaria, giardia, and toxoplasmosis.

The two diseases caused by protozoans are Malaria and Kala-azar.

Causative agent:

1. Malaria -a single-celled parasite of the genus plasmodiu
2. Kala-azar - Leishmania organism.