Question

why is endocytosis found only in animals

Answer 1

Endocytosis is more difficult in plants than in animals because the plasma membrane of a plant cell is usually pressed against the rigid cell wall by turgor pressure, which hinders the plasma membrane from invaginating into the cytosol. 

Answer 2

Answer:

Endocytosis is swallowing up of food and other substances from external medium by the plasma membrane. This is possible only when plasma membrane is in direct contact with external medium. It occurs only in animal cells. In plant cells, a cell wall is present on the plasma membrane. Therefore, their plasma membrane cannot perform endocytosis.