Why are lysosomes known as suicide bags

Why are lysosomes known as suicide

bags? 

Answer: Lysosomes are organelles that contain digestive enzymes. They digest excess or worn out organelles, food particles, and engulfed viruses or bacteria.

Lysosomes fuse with vacuoles and

dispense their enzymes into the vacuole, digesting its contents. Sometimes, lysosomes digest the cells that contain them. 

It happens when cells get damaged or destroyed. That's why lysosomes are

called suicidal bags.

E.g. When a tadpole develops into a frog,

lysosomes within the cells of the tadpole’s tail cause its digestion. Or Lysosomes help in defence by digesting germs, as in white blood cells.