1.The main function of contractile vacuole is osmoregulation.Hence it is found in amoeba and paramecium which are sea-
water dwellers.Entamoeba histolytica is a parasite found in the intestine of man where there is no need of osmoregulation.
2.Binary fission is the method of sexual reproduction in amoeba.In this process one cell divides into two cells .this process occurs when conditions are favourable.
3.Cyst formation is the mode of protection from adverse condition. When the conditions becomes favourable again the cyst absorbs water and the amoeba comes safely ou of it.
4.Trypanosoma occurs in many forms hence it is also called as polymorphic.
5.Euglena is a connecting link between plants and animals.It posses chlorophyll like plants hence can prepare its own food in the presence of sunlight but in the absence of sunlight it feeds as other animals.
6.Schizogony is the process of division in plasmodium.Cryptomerozoites are formed as a result of this division.
7.The two types of nuclei in paramecium are micronuclei smaller in size and macronuclei larger in size.
8.Protozoans are considered as totipotent eukaryotic cells as they have the capacity to divide and one cell can perform all the functions.
9.Pre erythrocytic cycle is the cycle in plasmodium which occurs in the liver away from blood cells.