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Unlike animal cells, plant cells have cell walls that make them rigid. Which organelle, other than the cell wall, also plays a vital role in providing rigidity to plant cells? A) Nucleus B) Chloroplast C) Central vacuole D) Endoplasmic reticulum

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Greenleafable
The correct answer is C. Central Vacuole

That's because the central vacuole provides pressure on the cell walls which keeps it firm and rigid. It is the largest organelle and is found usually in the middle of the cell. 

The correct answer is option (c). central vacuole.

The central vacuole is an organelle, which is important for maintaining the turgidity in the plant cell. The central vacuole stores water, minerals, salts and helps the cell to maintain the osmorality.

The central vacuole stores a lot of water in the cell, and swell up due to high water concentration, this provide the turgidity to the plant cell and keep intact with the cell wall.

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