Question

How and where lysosomes are formed in the cell?

Answer 1

In particular, lysosomes are formed by the fusion of transport vesicles budded from the trans Golgi network with endosomes, which contain molecules taken up by endocytosis at the plasma membrane.

Answer 2

A lysosome is a membrane-bound organelle found in nearly all animal cells. They are spherical vesicles which contain hydrolytic enzymes that can break down many kinds of biomolecules. ... Enzymes of the lysosomes are synthesised in the rough endoplasmic reticulum.