Question

how touch sensitiveness in some plants work

Answer 1

Light influences how shoots grow. They bend towards it, so that leaves will have the maximum amount for photosynthesis. Roots push down through soil because of the effect of gravity. They may also be drawn towards water, or away from bright light. Other factors, such as temperature and how wet the soil is, may affect when seeds germinate 

Answer 2

Plants are known to respond to a number of external stimuli like light, gravity, touch, chemicals, etc. Plants respond to the external factors with the help of receptors and hormones. The receptors help the plants to sense the external stimulus and act accordingly. As a result of these stimuli, various growth hormones are produced which result in the movement or directed growth of the plant. For example: Auxins are one of the major plant hormones which regulate the growth of a plant. They control the growth of plant in response to light.

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