What breaks down worn-out organelles?

Answer 1

Lysosomes destroys worn out organells.It provides space for new organells.

Answer 2

Worn-out organelles are broken down by a process called autophagy. Autophagy involves the formation of a double-membraned vesicle called an autophagosome that engulfs the organelle and fuses with a lysosome, where the organelle is degraded by enzymes.

Answer 3

Lysosomes