KVPY SB SX Exam 2011 Question Paper

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Question : 111 of 120

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BIOLOGY

Which sequence of events gives rise to flaccid guard cells and stomatal closure at night?

low [Glucose] ⇒ low osmotic pressure ⇒ low pH ⇒ high $pCO_2$
low pH ⇒ high $pCO_2$ ⇒ low [Glucose) ⇒ low osmotic pressure
low osmotic pressure ⇒ high $pCO_2$ ⇒ low pH ⇒ low [Glucose]
high $pCO_2$ ⇒ low pH ⇒ low [Glucose] ⇒ low osmotic pressure

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