The Science Behind Transpiration: Do plants sweat?

Transpiration in plants

Transpiration in Plants

Transpiration is the loss of water from plants in the form of water vapour.

Imagine, during your summer vacations, you go to play football outside. The Sun is scorching hot. One thing you need right now, more than scoring a goal, is a bottle of water! Any living being for that matter needs the same. Do you think plants also need the same?

Yes, they do.

 

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In fact, the water does not magically disappear from a plant. Plants lose water from them through a process called transpiration. 

Transpiration happens in part because plants need to breathe. Plants need to take in carbon dioxide and to do this, they need to open their stomata. When this happens, water comes out

 

Transpiration is the process by which moisture is carried through plants from the roots to small pores on the underside of leaves, where it evapourates to vapour and is released to the atmosphere.

Transpiration Water Cycle

This release of water vapour into the atmosphere, through transpiration, creates a water cycle. It is called the transpiration water cycle. It occurs when:

 

  • The water from the nearby soil is absorbed into the roots due to the hydraulic conductivity of the soil and the magnitude of the pressure gradient through the soil.
  • The water flows from the roots to the leaves. This is driven by capillary action (Capillary action occurs when the adhesion to the walls is stronger than the cohesive forces between the liquid molecules).
  • The water from the leaves enters the atmosphere. The water potential in the surrounding air is lower than the water potential in the leaf airspace of the stomatal pore. Due to this, water vapour from the cells in the leaves enters the atmosphere as water vapuor. This process is known as transpiration.
  • The water vapour in the atmosphere now forms clouds through the process of condensation. 
  • And these clouds of water vapour turn into water droplets and fall back on earth through the process of precipitation
  • This water that falls on the land, is then absorbed by the soil and is used to nourish the plants. 

This cycle keeps repeating and hence, is called the transpiration water cycle.

Tactivity

You will hardly need anything for this tactivity. If you have a broad leaved plant in your garden, then it is well and good, otherwise you can always head to the nearest park and look for the same.

All you need to do is wrap a plastic sheet around the leaf and close it tightly. Wait for a few hours and you will see water droplets inside the plastic sheet, as though the leaf has “sweat” – or  TRANSPIRED – as  shown in the video below:

To learn more about the applications and important concepts, enroll for your course on ThinkTac, where you can get to do live experiments using the materials that come with your package, to understand the concepts better.


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Theoretical Learning vs Experiential Learning

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TACtivity To Understand Simplicity 

Nowadays, the biggest hurdle to overcome is the kid’s attitude towards Science. 

You might think that it is boring or you simply don’t understand it. 

However, you may realise that declaring Science to be tough is simpler than trying to understand why!

Textbooks earlier said, ‘Man needs air, water, food and shelter for survival.’ Today they might as well say, ‘Man needs air, water, food, shelter and machines for survival.’

We, at ThinkTac,understand this and realise that classrooms need to bring the hands-on experiential tools approach to help you understand better and not fear it.

After all, we like what we understand.

Let’s Understand 

Okay, Junior Einsteins ! To invent, you need imagination and a pile
of junk. 

Yes, that’s how simple it is. 

TACtivity 1

We all are aware of the DIY experiments that we go through every now and then, especially when we have a science project submission to do.  

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However, we are going to move beyond the “memorising without understanding” approach.Y

Don’t run after the A grade, make it run after you. 

If you are in love with music and want to be reminded of your limits every time you play your favourite jam out loud,then making a SPEAKER is what you are going to love. 

TACtivity 2

Yes, we have more!! 

You know how people pull water from tube wells? There was a genius like you behind making it convenient for the people. 

You know what it’s called ? Yes, it’s called a pulley and you can make it on your own now. Also, understand better the process integrated in executing a pulley. 

All you need to do is to be a witness to your surroundings and practise the 3Rs at the same time- Reduce, Reuse, Recycle. 

Do you have innovative ideas of your own? 

Don’t shy away from contributing to the growth of Science.

  Register now for your biggest breakthrough. 

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