Opening and closing of stomatal pore depends on: 

(A) Atmospheric temperature 

(B) oxygen concentration around stomata 

(C) carbon dioxide concentration around stomata 

(D) water content in the guard cells 

 

Answer - 

The guard cells of the stomata swell when water flows into them , causing the stomatal pore to open. Similarly the pore closes if the guard cells shrink. 

Open and closed stomata-01.jpg

Thus, opening and and closing of stomatal pore depends on water content in the guard cells 

So, the correct answer is (d)  

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Solutions to CBSE Sample Paper - Science Class 10
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About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo