Which of the following labelled parts is responsible for the opening and closing of the stomatal pore?
निम्नलिखित में से कौनसा नामांकित भाग रंध्र छिद्र के खुलने तथा बंद होने के लिए उत्तरदायी होता है?
A
P
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B
Q
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C
R
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D
S
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