Describe the processof nutrition ina unicellular organisms

Amoeba is a unicellular organism belonging to the kingdom protista. 

Amoeba forms finger-like projections called pseudopodia (meaning false feet). Pseudopodia help the Amoeba in moving and capturing food.

When Amoeba senses its prey, it pushes out its pseudopodia around its prey and engulfs it. The food thus eaten gets trapped in the food vacuole. Amoeba   feeds on algae, rotifiers, protozoans, and  even other small  Amoeba.

Digestive juices are secreted inside the food vacuole in an Amoeba.   Theses juices act on the food and break it down into smaller components. The digested food is later absorbed by the Amoeba for growth, maintenance, and multiplication. The waste material or undigested food is then expelled out of the body.