What is the term used for the process of water evaporation through plant leaves?
Show answer & explanation
Correct answer: B
Explanation
Correct Answer
Transpiration
Explanation
The process of water movement through a plant and its evaporation from aerial parts, especially leaves, is called Transpiration. Plants absorb water through their root systems, transport it up through the xylem tissues, and release it as water vapor into the atmosphere primarily through microscopic pores on the leaves called stomata. This process creates a suction pull (transpiration pull) that helps draw minerals and water from the soil to the upper parts of the plant while also cooling the plant structure.
Key Points
The rate of transpiration depends heavily on the opening and closing of stomata on the leaf surface, which are regulated by specialized guard cells. This process is fully influenced by environmental factors such as light intensity, temperature, atmospheric humidity, and wind speed. When the surrounding air is dry or hot, the rate of water loss increases significantly.
Additional Facts
Approximately 97 to 99 percent of the total water absorbed by a plant's roots is lost to the atmosphere through this process. Transpiration is vital for maintaining cellular turgor pressure which keeps the plant structurally upright, and it plays a massive role in the global water cycle. A single mature tree can transpire thousands of gallons of water into the atmosphere every year, actively influencing local precipitation patterns and cooling the surrounding environment.
Important Questions and Answers
Question: What are the microscopic specialized structures on the surface of plant leaves through which the majority of water vapor is released during transpiration?
Answer: Stomata.
Question: Which specialized plant vascular tissue is responsible for conducting water and dissolved nutrients upward from the roots to the leaves?
Answer: Xylem.