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B
Kidney shaped
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C
Rectangular
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D
Barrel-shaped
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Solution
The correct option is B Kidney shaped Mustard is a dicot plant and dicots have bean or kidney-shaped guard cells that guard the stoma. The shape of the guard cells in monocots, such as grasses and sugarcane is dumb-bell shaped. Guard cells are one of the components of the stomatal apparatus. Stomata are minute openings on the epidermis of the leaves which are responsible for the regulation of transpiration and gaseous exchange.