Subject :NSO Class : Class 8
Refer to the given dichotomous key. Identify P-T and select the correct statement regarding them.
I. (A) It is a unicellular organism. - Go to II
(B) It is a multicellular organism. - Go to IV
II. (A) It possesses well organised nucleus. - Go to III
(B) It lacks well organised nucleus. - 
III. (A) Nutrition is parasitic. - 
(B) Nutrition is mixotrophic. - 
IV. (A) It possesses chlorophyll. - 
(B) It lacks chlorophyll. - 
AP could be slipper animalcule.
BR could be Euglena which possesses cilia that help in movement.
CQ could be Plasmodium which causes malaria or it could be Entamoeba which causes amoebic dysentery in humans.
DS could be an alga like Chlamydomonas whereas T could be a scavenger like vulture or a decomposer like Giardia.