Why is endocytosis found in animals only ?

Endocytosis generally occurs in animal cells and very rarely in plant cells as the cell membrane in plant cell is surrounded by a rigid cell wall. Cell wall causes hindrance in the invagination of plasma membrane which forms the transport vesicles for the transfer of substances in the cytoplasm of the cell. 

Nitrogen fixing bacteria enter the root cells in legumes through endocytosis. 

 

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Endocytosis is the process in which flexible cell membrane engulfs in food and other material from its external environments. Amoeba acquires its food through this process.

Since plant cells have cell wall, it covers the cell membrane from external environments and endocytosis is not found in plant cells. Cell membrane is soft and elastic but cell wall is hard and rigid.

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