The Graph Shows Records of Temperature (Light Gray Line) and CO₂

question 26

Multiple Choice

The graph shows records of temperature (light gray line) and CO₂ (dark gray line) over the past 1,000 years. CO₂ is recorded in parts per million (ppm) .
-If the trends shown in the graph continue, how might this affect photosynthesis?

• A) Photorespiration may increase, leading to an increase in photosynthetic production of sugar.
• B) Photorespiration may increase, leading to a decrease in photosynthetic production of sugar.
• C) C₄ and CAM plants would be unable to photosynthesize.
• D) There would be no effect on photorespiration, since CO₂ and temperature are stable.

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