Which of the following does not arise from a substantial shortage of water for plants?

Shortage of carbon dioxide 

The correct answer is option 3.Shortage of carbon dioxide.

All are the effects of acute shortage of water on plants, except shortage of carbon dioxide, because plants give us oxygen, not carbon dioxide. The lack of water will prevent plants from producing enough food for both themselves and people. Plants won't be able to emit enough oxygen into the air due to decreased photosynthesis brought on by a lack of water, which will also result in a lack of food and less rainfall. CO₂ shortage, however, is untrue.