How do auxins promote the growth in tandril around a support??
Answers
Auxins are the phytohormones that promote the growth of the plant. but, it should be noted that Auxins move away from sunlight.
Keeping that in mind, when a tendril of a plant is growing in the morning, the auxins move towards the other side of the tendril.
On moving toward the other side of the tendril, all the auxins released will get accumulated there. Thus, on accumulation, the plant will start growing (as Auxins promote growth).
On growing, the tendril will bend down or stoop due to the weight of the growing tendril and that is when we say, by observing this, that the plant is growing.
Attached is a picture that will help ij better understanding.
*All images are from Google.
Thanks!!!
When the tip of a tendril touches a support , then the auxins present in its tip move to that side of tip which is away from the support . Auxins promote growth . So due to more auxins in it , the side of tendril away from the support grows faster than the side which is in contact with the support and makes the tendril twirl around the support .