Transpiration and Photosynthesis – a compromise. Explain.

Transpiration has more than one purpose it :
* It creates transpiration pull for absorption and transportation of water in plants.
* It supplies water for photosynthesis.
* An actively photosynthesizing plant has an insatiable need for water.
* Photosynthesis is limited by available water which can be swiftly depleted by transpiration.
* The evolution of the C₄ photosynthetic system is probably one of the strategies for maximizing the availability of CO₂ while minimizing water loss.
* C₄ plant loses only half as much water as a C₃ plant for the same amount of CO₂ fixed.