Roots of the plant grow in the presence of water. As a result, they tend to increase in the direction where water is available. The reason for growing root towards the earth, Gravitropism is also because of water.
Auxins are growth regulators of the plant. Plant produce auxin at the tip of bud. A tendril is a specialised stem which supports a plant in climbing.
Plants release natural chemical substances for their growth and development. The plant hormones that promote growth is AuxinGibberellinCytokininFor more
We all see the shrinking of leaves in touch me not plant (Chui-Mui) in response to touch or air.Plant shrink its leaves and the stem droop in response to touch.This happens due to changes in the turgor pressure.