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Answer:
The boundary layer is a thin region of calm air that encompass each leaf. The hardness of the boundary layer affects how rapidly gasses and energy are interchanged between the leaf and the neighbouring air. A dense or hard boundary layer can decrease the passage of heat, CO2 and water vapor from the leaf to the surrounding.
The boundary layer surrounding a photosynthetic organism make it difficult for the organism to obtain the carbon dioxide it needs for photosynthesis as this is due to the boundary layer which is made of unstirred water, CO2 and HCO3− can be reduced within the boundary layer by uptake— mostly in the region nearest to the photosynthesizing organism—but the expelled gases are slow to be recovered from the encompassing water.
Answer:
Because this boundary layer consists of unstirred water, carbon dioxide, and HCO₃ can be depleted in the boundary layer by uptake, especially in the region closest to the photosynthetic organism. Still, the removed gases can be slowly replaced by the surrounding water.
