 Let's summarize some of the important plant hormones. The first two are oxen and gibberlin or gibberlin They're both growth hormones. So you know what their main function is is in cell elongation making the cell bigger elongated Okay, but oxen is mostly useful in tropism. Tropism is where plants turn and grow for example in phototropism The plant will the shoot will turn towards the light and the roots will turn away from the light But how does it happen oxen is responsible for that and the way it works is if we zoom into one of the places If you zoom in over here, what we'll find is that the oxen hormones will move away from the light So a lot of oxen will get concentrated over here and therefore this part the part that's away from the light That will grow more than the part that is towards the light now because this part grows more than this one The whole plant ends up turning towards the light over here Gibberlin on the other hand is mostly useful in the growth of the stem itself Okay, so these two help in cell elongation, but elongating cells itself is not enough You also want to create more cells and that's where the third hormone comes into picture cytokinin Cytos stands for cell kynin means division. So this hormone is mostly useful for cell division So with these three hormones, we have more cells being formed and we have the cells becoming bigger So you can see how these are helpful in the growth But growth is not the only thing that's responsible. That's necessary Sometimes you want a hormone to stop the growth and so one such hormone is called abscissic acid This helps in stopping the growth, but you may ask why do you need to stop the growth? Here is an example of what abscissic acid can do Imagine you have a seed that is in a very dry land. There is not much water. It's drought. Let's say Now if that seed germinates it doesn't get water and it'll die. So you don't want the seed to germinate That's where abscissic acid will come into picture. There'll be a lot of abscissic acid over here Which does not allow the seed to germinate But once it rains That abscissic acid will get washed away and now there will be enough water Because of that now it can start growing. So you see it's super important sometimes to also stop the growth So these are some of the important growth and growth inhibitor hormones