You’ve studied how plants absorb water. But have you ever wondered how they release it? Dive into this article to unravel the secret and ace your O Level Biology course.
What is Transpiration in Plants
It is a process through which plants release water vapour to their surroundings
Students often have the question, “Transpiration in plants occurs through what exactly?”
The answer is stomata:
Stomata are tiny openings, often found on the underside of leaves
They allow water from inside the leaf to escape to the surroundings
This “diffusion” of water vapour occurs down the concentration gradient.
If you are not comfortable with the concepts of diffusion and concentration gradient, read our article here for a complete explanation!
Why Should I Know about Transpiration in Plants
If you’re wondering how to get A* in O Level Biology, understanding the meaning of transpiration in plants is a good starting point. It forms the basis of the chapters on plant biology.
Importance of Transpiration in Plants
A plant doesn’t just release water without reason. In fact, this process serves vital purposes:
Release of water helps cool the plant, just like how sweating helps reduce human body temperature
It also helps the plant turgid and upright
Factors Affecting Transpiration in Plants
Factors affecting transpiration in plants are:
Light: Stomata open wider in bright light, increasing the rate of transpiration.
Humidity: High humidity reduces transpiration. If there is already moisture in the outside air, water vapour won’t diffuse out of the stomata as easily.
Wind: Faster wind carries away the released water vapour, setting up a steep concentration gradient and increasing transpiration
Tips to Ace Transpiration Questions in O Level Biology
We are often asked: “Is O Level Biology hard?”. Not at all, if you take time building concepts:
To recap, the meaning of transpiration in plants is “breathing out” water vapour. Transpiration is useful for plants because it aids cooling and helps maintain turgidity.
Remember, being thorough with this chapter can help you score top marks in O Level Biology. If you found this guide useful and want to learn more, stay tuned to Out-Class for more!