Endocytosis is the process of engulfing food particles from the exterior medium with the help of cell membrane. In this process a food vacuole enclosing the food is formed by extending the pseudopodia and encircling it.

Endocytosis is the process by which amoeba acquires its food. It is a type of cellular transport mechanism that involves the engulfing of external materials by the cell membrane to form a food vacuole.

Process of Endocytosis:
1. Formation of pseudopodia: Amoeba extends its pseudopodia (temporary projections of the cell membrane) towards the food particle.
2. Enclosure of food particle: The pseudopodia surround and engulf the food particle, forming a food vacuole.
3. Formation of food vacuole: The engulfed food particle becomes enclosed within the cell membrane, forming a food vacuole inside the amoeba.
4. Fusion of lysosomes: The food vacuole fuses with lysosomes (organelles containing digestive enzymes) within the cytoplasm of amoeba.
5. Digestion of food: The enzymes released by the lysosomes break down the food particles into simpler forms, which can be absorbed and utilized by the amoeba.
6. Transportation of nutrients: The digested nutrients are then transported to various parts of the amoeba through the cytoplasm for energy production and other metabolic processes.
7. Excretion of waste: The undigested waste materials are eliminated from the amoeba through exocytosis, a process in which the indigestible materials are expelled out of the cell.

Significance of Endocytosis:
Endocytosis is essential for the survival of amoeba as it allows the organism to obtain nutrients from its environment. By engulfing and digesting food particles, amoeba can obtain the necessary energy and building blocks for growth, reproduction, and other cellular activities.

Comparison with Exocytosis:
While endocytosis is the process by which amoeba acquires food, exocytosis is the process by which undigested waste materials are eliminated from the cell. Exocytosis is the opposite of endocytosis, where materials are released from the cell by the fusion of vesicles with the cell membrane.

In conclusion, amoeba acquires its food through the process of endocytosis, which involves the engulfing and digestion of food particles within the cell. This process is crucial for the survival and sustenance of amoeba.