Question

what would happen if the plasma membrane rupture or breakdown

Answer 1

If the plasma membrane ruptures or break down, then the whole cell will die.
IN simple, the cell will be destroyed as the plasma membrane supported the cell organelles to remain in its own place.
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Answer 2

Answer:

Plasma membrane is selectively permeable membrane of the cell that maintains its homeostasis. If it ruptures or breakdown the constant internal chemical composition of the cell will be lost and it will not be able to perform its basic functions. Such a cell with ruptured plasma membrane is killed.