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Plant Water Relation — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYPlant Water Relation5 Marks
Question
Structure of stomatal apparatus.
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Answer

$1.$ Stomata are minute openings mainly located in the epidermal surfaces of young stem and leaves.
$2.$ It is composed of two guard cells and accessory cells which form the opening stomatal pore for transpiration.
$3.$ Guard cells are kidney shaped in dicot plants and dumbbell shaped in grasses.
$4.$ Guard cells have unevenly thickened wall, inner wall thick, inelastic while outer wall is thin and elastic.
$5.$ Guard cells are nucleated cells with few chloroplasts and hence can perform photosynthesis.
$6.$ Accessory cells are specialized cells that surround the guard cells and are reservoirs of $K^+$ ions.

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