The cell wall and outer frame of a car perform similar functions in their respective systems!
The cellulose cell wall gives the plant a regular and fixed shape. It also resists turgor pressure exerted by the vacuole. Similarly, the outer frame of a car provides the structure for the car and protects its interior.
However, the cell wall is fully permeable and allows all substances to enter the plant. This does not apply to the outer frame of the car. Not everything can pass through it, in fact, nothing can unless through the door!
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