Question : The kidney-shaped guard cells are present in which of the following?
Option 1: Dicot plants
Option 2: Monocot plants
Option 3: Both of the above
Option 4: Algae
Correct Answer: Dicot plants
Solution : The correct option is dicot plants .
The presence of kidney-shaped guard cells is a distinguishing trait of dicotyledonous plants. Guard cells are specialised cells in the Epidermis (outermost layer) of leaves and stems, specifically in stomata (holes on the leaf surface). Guard cells of monocotyledonous or monocot plants are generally elongated or dumbbell-like. Guard cells in monocots are often placed parallel to one another within the stomata. When they swell and become turgid, the stomatal hole opens, allowing gases to exchange. When they become flaccid and lose their turgidity, the stomatal pore shuts, minimising water loss through transpiration and preventing excessive water loss in dry or stressful environments.
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