Higher atmospheric CO2 levels can decrease C3 plant ...

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Higher atmospheric CO2 levels can decrease C3 plant ...

BlackTom AI · Accepted Answer

The prompt states a question about how higher atmospheric CO2 levels affect C3 plants, specifically focusing on what may decrease as a result. 
First, consider the provided answer: 'Water loss by transpiration.' In C3 plants, elevated CO2 often leads to stomatal closure or reduced stomatal aperture because plants can fix CO2 more efficiently when it is abundant. This partial stomatal closure decreases the rate at which water vapor exits the leaf, thereby reducing transpiration. As a consequence, overall water loss through transpiration tends to decline under higher CO2, improving water use efficiency for many C3 species. 
Next, with no additional answer options listed in the material, there is no other candidate choice to evaluate. However, given what we know about plant physiology, other potential consequences linked to higher CO2—such as photosynthetic rate increases or changes in leaf anatomy—do not directly negate the specific statement about transpiration; they simply describe different aspects of C3 plant responses. 
In summary, the statement that higher atmospheric CO2 levels can decrease water loss by transpiration aligns with established plant physiology: increased CO2 reduces the need to open stomata as widely, which lowers transpiration rates. The absence of alternative options means there is nothing to compare against this particular claim within the provided list.

AGRI20037_2025_SM2 11. Climate Change

Higher atmospheric CO2 levels can decrease C3 plant ...

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