Question

Why lysosomes are called sucidal bags

Answer 1

Lysosomes are known as suicide bags cause they contain large number of enzymes that digest the foreign particles which enter into the cell. This process is called autolysis

Answer 2

when the cell is degraded or damaged, the lysosomes release (break open) the acidic enzymes within them into the cell.  The cell organelles are digested/destroyed.  So cell dies.