NCERT Solutions for Class 9 Science Chapter 5
The Fundamental Unit of Life
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-66
Questions No- 3
What would happen if the plasma membrane ruptures or breaks down?
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Plasma membrane is a selectively permeable membrane of the cell that maintains its homeostasis, i.e., constant internal composition of the cell. If it ruptures or breaks down 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.
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Impact of Ruptured Plasma Membrane on Cells:
1. Disrupted Cellular Balance:
– The plasma membrane maintains a controlled internal environment by selectively allowing substances in and out. If ruptured, this balance is disturbed, affecting the cell’s stability.
2. Cellular Damage:
– Breakdown of the membrane can lead to the leakage of important molecules, disrupting cellular structures and functions, potentially causing damage.
3. Altered Cell Shape:
– Loss of membrane integrity can cause excessive water entry or exit, leading to changes in cell shape, swelling, or shrinkage, impacting normal cell structure.
4. Uncontrolled Substance Movement:
– Rupture allows uncontrolled entry of substances, possibly including harmful materials, affecting normal cellular processes and potentially causing toxicity.
5. Cellular Response and Repair:
– Cells have mechanisms to repair minor membrane damage. They can initiate repair processes to seal ruptures. However, extensive damage may surpass the cell’s repair capabilities.
6. Cell Fate:
– Severe damage can lead to cell death due to the inability to maintain essential functions or the influx of harmful substances causing cellular toxicity.
A ruptured plasma membrane disrupts cellular balance, causes potential damage, alters cell shape, and may lead to toxicity or cell death. The membrane’s integrity is crucial for maintaining stability and protecting the cell’s internal environment.