Most plants respond to elevated atmospheric carbon dioxide concentrations by partially closing their stomata,reducing water loss due to transpiration.

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This is correct. When atmospheric carbon dioxide concentrations increase, plants respond by partially closing their stomata to reduce water loss through transpiration. This is because elevated CO2 levels allow for more efficient photosynthesis, reducing the need for plants to open their stomata to take in more carbon dioxide.

Most Plants Respond to Elevated Atmospheric Carbon Dioxide Concentrations by Partially