Question

Does co2 concentration affect opening and closing of stomata

Answer 1

Three different environmental factors affect the opening and closing of a plant stoma: light, water and carbon dioxide concentrations. Plant stomata close in darkness and when conditions are very dry. Since plant cells need carbon dioxide for photosynthesis, carbon dioxide concentrations are another key factor. If carbon dioxide concentrations inside the leaf start to fall, the plant will open its stomata so that more CO2 can enter, even under dry conditions when the stomata would ordinarily be closed.
So we can say that co2 concentration affects the opening and closing of stomata..
Hope it helps...

Answer 2

The opening and closing of the pore is a function of the guard cells. The guard cells swell when water flows into them, causing the stomatal pore to open. Simillarly the pore closes if the guard cells shrink