Question

why it is said that "lysosomes are a kind of waste disposal system of the cell"?

Answer 1

Lysosomes are kind of wasted disposal system as they contain enzymes which can cause lysis or breakdown of anything which is not required by the cell. They can even cause the breakdown of the entire cellular structure if required.

Answer 2

Lysosomes are simple tiny spherical sac-like structures evenly distributed in the cytoplasm.

Its enzymes are made up by RER.

Since, it have enzymes hence, they destroy any foreign materials entered in the cell, to protect its cell.

Hence they are said as a kind of waste disposal system of the cell.