Specialized epidermal cells surrounding the guard cells are called:

Complementary cells

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Subsidiary cells

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Bulliform cells

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Lenticels

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Solution

The correct option is B Subsidiary cells
A stoma (singular for stomata) is surrounded by two types of specialized plant cells that differ from other plant epidermal cells. These cells are called guard cells and subsidiary cells.
Subsidiary cells, also called accessory cells, surround and support guard cells. They act as a buffer between guard cells and epidermal cells, protecting epidermal cells against guard cell expansion.

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Kidney-shaped cells that surround the stoma are called guard cells.

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