Transpiration is considered as beneficial for plants as well as harmful activity. In the opinion of many scientists, the process of transpiration is a necessary evil for plants because of the following aspects.
- The ascent of sap depends on transpiration pull.
- Absorption of water and minerals and their transportation is also due to transpiration.
- Transpiration has a cooling effect on leaves and the whole plant body.
- The structure of leaf favourable for entry of atmospheric is also favourable for transpiration.
- In fact, no land plant can survive without transpiration.
- However, it becomes evil because it creates water deficit in the plant and injury by dehydration when available soil water decreases, and when the rate of absorption becomes low, transpiration may lead to wilting of the shoot.
- Millions of plant die, every year on account of transpiration when it exceeds absorption.
